Rapid injection molding mold

Abstract

The utility model relates to the technical field of plastic molding, and discloses a rapid injection molding mold, which comprises a movable mold assembly and a fixed mold assembly, the fixed mold assembly comprises a front mold plate and a front mold core arranged on the front mold plate, and the movable mold assembly comprises a rear mold plate capable of being opened and closed relative to the front mold plate. A rear mold core corresponding to the position of the front mold core is arranged on the rear mold plate; a plurality of cavities are formed in the positions, close to the ground side, between the rear mold core and the front mold core, and the multiple cavities are linearly arranged. The cavities are close to the ground side of the mold, so that the falling time of a molded product after ejection can be shortened, and the multiple cavities are arranged in a straight line, so that the molded product can simultaneously fall off; by means of the structure, the purpose of shortening the injection molding period can be achieved, the mold can conduct injection molding production rapidly and continuously, and more products can be produced within effective time.

Description

Technical Field

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

[0002] Injection molding means that in the heated barrel of the injection molding machine, the plastic is melted by heat, pushed by the screw or plunger, and enters the mold cavity through the nozzle and the mold pouring system. Finally, the plastic hardens and takes shape in the cavity. In the increasingly competitive market environment, if companies want to develop steadily and stand out, they must control and optimize from all aspects, so cost control is particularly important.

[0003] In the field of injection molds, the injection molding cycle is one of the key factors in cost control; especially for some medical and fast-moving consumer packaging products, due to the large market demand for products, molds need to be quickly and continuously injected into production. Only by shortening the injection molding cycle as much as possible can more products be produced within an effective time and more value be obtained. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a rapid injection molding mold, in which the cavity is arranged at a position close to the ground side of the mold to shorten the time for the molded product to fall after being ejected, and a plurality of cavities are arranged in a line to ensure that the molded products can fall at the same time, thereby achieving the purpose of shortening the injection molding cycle.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a rapid injection molding mold, including a movable mold component and a fixed mold component that can be opened and closed relatively, the fixed mold component includes a front template and a front mold core arranged on the front template, the movable mold component includes a rear template that can be opened and closed relative to the front template, and the rear template is provided with a rear mold core corresponding to the position of the front mold core; after the rear template is molded with the front template, a plurality of cavities are formed between the rear mold core and the front mold core at a position close to the ground side, and the plurality of cavities are arranged in a straight line.

[0006] Optionally, a hot nozzle body corresponding to the position and number of the cavities is provided on the front mold core, a discharge port of the hot nozzle body is connected to the cavity, and an ejector pin assembly corresponding to the position and number of the cavities and used to eject the product is movably provided on the rear mold core.

[0007] Optionally, the ejector pin assembly includes a product ejector pin and a balancing ejector pin capable of moving in the axial direction, and both the product ejector pin and the balancing ejector pin are perpendicular to the rear mold core.

[0008] Optionally, the product ejector pin is located below the balancing ejector pin, and the balancing ejector pin is coaxial with the hot nozzle body.

[0009] Optionally, a side of the rear template close to the front template is provided with an air avoidance groove, the air avoidance groove is located below the rear mold core, and the depth of the air avoidance groove is greater than the maximum external dimension of the product.

[0010] Optionally, the rear mold core and the front mold core are close to the ground side of the mold, and a rear mold balance block is fixedly installed on the rear mold template, and the rear mold balance block is located above the rear mold core, and a front mold balance block corresponding to the position of the rear mold balance block is fixedly installed on the front mold template.

[0011] Optionally, an air circuit is provided inside the rear mold balancing block, a plurality of air outlets are provided on a side of the rear mold balancing block close to the rear mold core, and one end of the air outlet is connected to the air circuit.

[0012] Optionally, a water channel surrounding the cavity is provided inside the rear mold core, and a plurality of water stoppers for limiting the flow direction of cooling water are fixedly installed inside the water channel.

[0013] Beneficial Effects

[0014] (1) The cavity of the utility model is close to the ground side of the mold, which can shorten the time for the molded product to fall after being ejected, and the multiple cavities are arranged in a row to ensure that the molded products can fall at the same time; this structure can achieve the purpose of shortening the injection molding cycle, so that the mold can perform injection molding production quickly and continuously, so as to produce more products within an effective time.

[0015] (2) In the present invention, the mold cavity is arranged close to the ground side, which means that the front mold core and the rear mold core are also located on the ground side of the mold. Therefore, by arranging the front and rear mold balance blocks at a position close to the sky side, it can be effectively ensured that the mold can be opened and closed smoothly.

[0016] (3) In the present invention, the product is ejected by the ejector assembly after molding. Since the cavity is arranged eccentrically close to the ground side, the product ejector and the balance ejector are used to eject the product, thereby ensuring the balance of the mold ejection system.

[0017] (4) An air path is provided inside the rear mold balance block in the utility model, through which the external air flow can be discharged through the air outlet, and the air outlet is directed toward the molded product. Air is blown after the product is ejected, which can increase the speed at which the product falls, thereby shortening the injection molding cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0020] Figure 3 It is a structural schematic diagram of the utility model of the air avoidance groove;

[0021] Figure 4 It is a schematic diagram of the structure of the front and rear mold cores of the utility model;

[0022] Figure 5 This is a schematic diagram of the position structure of the hot nozzle body and the cavity of the utility model;

[0023] Figure 6 It is a schematic diagram of the position structure of the ejector pin, the balancing ejector pin and the cavity of the utility model product;

[0024] Figure 7 This is a schematic diagram of the water channel structure inside the rear mold core of the utility model;

[0025] Figure 8 It is a schematic diagram of the gas path structure inside the rear mold balance block of the utility model;

[0026] Fig. 9 It is a structural schematic diagram of the hot nozzle insert of the utility model;

[0027] Among them, 1. movable mold assembly; 11. rear mold plate; 12. rear mold core; 13. rear mold balancing block; 14. air avoidance groove; 2. fixed mold assembly; 21. front mold plate; 22. front mold core; 23. front mold balancing block; 3. hot nozzle body; 4. hot nozzle insert; 41. glue outlet; 42. matching surface; 43. air avoidance surface; 51. product ejector pin; 52. balancing ejector pin; 6. water channel; 61. water stopper; 7. air channel; 71. air outlet; 8. cavity. DETAILED DESCRIPTION

[0028] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0029] Embodiment 1

[0030] like Figure 1-Figure 6 As shown, a rapid injection molding mold includes a movable mold component 1 and a fixed mold component 2 that can be opened and closed relatively, the fixed mold component 2 includes a front mold plate 21 and a front mold core 22 arranged on the front mold plate 21, the movable mold component 1 includes a rear mold plate 11 that can be opened and closed relative to the front mold plate 21, and the rear mold core 12 corresponding to the position of the front mold core 22 is arranged on the rear mold plate 11; after the rear mold plate 11 is molded with the front mold plate 21, a plurality of cavities 8 are formed between the rear mold core 12 and the front mold core 22 at a position close to the ground, and the plurality of cavities 8 are arranged in a straight line.

[0031] As mentioned above, the cavity 8 is close to the ground side of the mold, which can shorten the time for the molded product to fall after being ejected, and the multiple cavities 8 are arranged in a row to ensure that the molded products can fall at the same time; this structure can achieve the purpose of shortening the injection molding cycle, so that the mold can perform injection molding production quickly and continuously, so as to produce more products within an effective time.

[0032] Among them, since the opening and closing drive of the mold is an existing technology, it will not be described in detail here; and the division of the upper and lower sides of the mold is based on the mold being placed on the injection molding machine. When the mold is installed on the injection molding machine, the upper side is the upper side, the lower side is the lower side, the side operated by the staff is called the operating side, and the other side, which is the side away from the operator, is called the non-operating side or the back operating side.

[0033] like Figure 4-Figure 5 , Fig. 9 As shown, a hot nozzle body 3 corresponding to the position and number of the cavity 8 is penetrated on the front mold core 22, the discharge port of the hot nozzle body 3 is connected with the cavity 8, and a hot nozzle insert 4 is sleeved on one end of the hot nozzle body 3 close to the discharge port, and one of the end faces of the hot nozzle insert 4 serves as a part of the inner wall of the cavity 8.

[0034] The hot nozzle body 3 adopts the existing technology and is cast in the form of a single-point valve needle. The end of the hot nozzle insert 4 has a protrusion, and the protrusion is provided with a glue outlet 41 connected to the discharge port of the hot nozzle body 3; the end of the hot nozzle insert 4 has a mating surface 42 and a clearance surface 43 to ensure its assembly accuracy and injection molding accuracy.

[0035] like Figure 4-Figure 6 As shown, the rear mold core 12 is provided with an ejector assembly corresponding to the position and number of the cavity 8 for ejecting the product. The ejector assembly includes a product ejector 51 and a balance ejector 52 that can move in the axial direction, and the product ejector 51 and the balance ejector 52 are perpendicular to the rear mold core 12.

[0036] As described above, the product ejector 51 is located below the balancing ejector 52, and the balancing ejector 52 is coaxial with the nozzle body 3. Since the cavity 8 is eccentrically arranged close to the ground side, the product ejector 51 is arranged close to the ground side, and the balancing ejector 52 is arranged close to the sky side. The two are driven by the ejector plate to move synchronously. On the premise of satisfying the ejection of the product, the balance of the mold ejection system can also be ensured.

[0037] like Figure 2-Figure 3 As shown, a side of the rear template 11 close to the front template 21 is provided with an air avoidance groove 14, and the air avoidance groove 14 is located below the rear mold core 12. The air avoidance groove 14 is located in the product falling area on the ground side of the rear template 11, and its function is to shorten the distance the product falls, and the depth of the air avoidance groove 14 is greater than the maximum external dimension of the product to prevent the product from being crushed.

[0038] Embodiment 2

[0039] like Figure 2-Figure 3 As shown, based on the first embodiment, a rear mold balancing block 13 is fixedly mounted on the rear mold plate 11 , and the rear mold balancing block 13 is located above the rear mold core 12 , and a front mold balancing block 23 corresponding to the position of the rear mold balancing block 13 is fixedly mounted on the front mold plate 21 .

[0040] As mentioned above, since the mold cavity 8 is arranged close to the ground side, it means that the front mold core 22 and the rear mold core 12 are also located on the ground side of the mold. To ensure that the mold can be opened and closed smoothly, it is necessary to design a front mold balance block 23 and a rear mold balance block 13 at the sky side position corresponding to the mold core.

[0041] Furthermore, an air path 7 is provided inside the rear mold balancing block 13 , and a plurality of air outlets 71 are provided on one side of the rear mold balancing block 13 close to the rear mold core 12 , and one end of the air outlet 71 is communicated with the air path 7 .

[0042] External compressed gas can enter the gas outlet 71 through the gas path 7 and then be discharged along the gas outlet 71. The gas outlet 71 faces the molded product. After the product is ejected by the ejector assembly, the air flow is discharged through the gas outlet 71 to blow it, which can increase the speed of the product falling and thus shorten the injection molding cycle.

[0043] Embodiment 3

[0044] like Figure 7 As shown, a water channel 6 surrounding the cavity 8 is provided inside the rear mold core 12 , and a plurality of water stoppers 61 for limiting the flow direction of cooling water are fixedly installed inside the water channel 6 .

[0045] In order to achieve the goal of 1-second injection molding, after the injection is completed, the product needs to be quickly cooled to the temperature required for ejection. Therefore, when designing the water channel 6, its diameter should be as large as possible and as close to the product area as possible. Then, through the obstruction of the water stopper 61, an effective cooling circuit is formed to quickly take away the heat from the product area. If necessary, a 3D printed conformable water channel 6 can be designed.

[0046] In order to facilitate the processing of the water channel 6, long channels are symmetrically opened on the upper and lower sides of the cavity 8, and a short channel is opened between each adjacent cavity 8. The long and short channels are vertically connected to each other, and the redundant end openings are closed. The water stopper 61 is staggered and installed in the two long channels to form a cooling circuit that bends around the cavity 8. The direction and path of the cooling water flow are as follows: Figure 7 shown.

[0047] If the water stopper 61 is not installed, the cooling water cannot flow in the short channel, and rapid cooling cannot be effectively achieved.

[0048] In summary, the utility model breaks the traditional design ideas and optimizes several major systems in the injection mold design according to customer demand for products during mold design, and designs around the center of shortening the injection molding cycle as much as possible.

[0049] Optimize product placement, abandon the traditional concept of central symmetrical placement, and arrange the products in a line close to the ground side, while ensuring that the products fall at the same time, minimize the time for the products to fall after being ejected; at the same time, open an air avoidance groove 14 in the product falling area on the ground side of the rear template 11 to shorten the product falling distance. The depth of the air avoidance groove 14 needs to be greater than the maximum shape of the product to prevent the product from being crushed; and the products are arranged close to the ground side, which means that the front mold core 22 and the rear mold core 12 are located on the ground side of the mold. In order to ensure that the mold can be opened and closed smoothly, it is necessary to design the front mold balance block 23 and the rear mold balance block 13 at the sky side position corresponding to the mold core; in addition, an air path 7 is also added to the rear mold balance block 13 to facilitate blowing after the product is ejected to accelerate the product falling;

[0050] Optimize the pouring system, combine the analysis data and evaluation report provided by the hot runner supplier, determine the optimal spacing between products, as well as the heat loss, and reasonably design the hot runner insert 4;

[0051] Optimize the cooling system. Since the injection molding cycle of the product is short, the product needs to quickly reach the temperature required for ejection after the injection molding is completed. Therefore, the cooling of the product must be sufficient and reasonable. The arrangement of water channel 6 should be as close to the product area as possible.

[0052] Optimize the ejection system. Due to the limitation of the product molding cycle, the ejector pin 51 of the product needs to be ejected and retracted continuously, quickly and with high strength. The ejector pin needs to be made of a fully hard and tough material and coated to reduce friction. In addition, on the premise of ensuring the smooth ejection of the product, the balance of the entire mold ejection system also needs to be ensured. Since the product is eccentrically arranged on the ground side, it is necessary to design a balancing ejector pin 52 at a symmetrical position on the sky side.

[0053] In addition, the selection of mold steel is also crucial. For the product cavity 8, the front mold core 22, the rear mold core 12, and the rear mold insert should be made of steel with high thermal conductivity and good wear resistance. However, steel with high thermal conductivity usually has poor corrosion resistance. Therefore, the surfaces of these parts need to be specially coated to increase corrosion resistance and wear resistance. For the mold frame, the rear mold plate 11 and other mold plates should be made of stainless steel to avoid rust and corrosion on the water channel 6 and the mold surface, thereby reducing the frequency of mold maintenance.

[0054] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0056] The above is based on the ideal embodiment of the utility model. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of this utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A rapid injection molding mold, comprising a movable mold component (1) and a fixed mold component (2) that can be opened and closed relative to each other, characterized in that: The fixed mold assembly (2) comprises a front mold plate (21) and a front mold core (22) arranged on the front mold plate (21); the movable mold assembly (1) comprises a rear mold plate (11) capable of opening and closing relative to the front mold plate (21); and the rear mold core (12) corresponding to the position of the front mold core (22) is arranged on the rear mold plate (11); After the rear mold plate (11) and the front mold plate (21) are molded together, a plurality of mold cavities (8) are formed between the rear mold core (12) and the front mold core (22) at a position close to the ground, and the plurality of mold cavities (8) are arranged in a straight line.

2. The rapid injection molding mold according to claim 1, characterized in that: The front mold core (22) is provided with a hot nozzle body (3) corresponding to the position and number of the mold cavities (8), the discharge port of the hot nozzle body (3) is connected to the mold cavities (8), and the rear mold core (12) is movably provided with an ejector pin assembly corresponding to the position and number of the mold cavities (8) for ejecting products.

3. The rapid injection molding mold according to claim 2, characterized in that: The ejector pin assembly comprises a product ejector pin (51) and a balancing ejector pin (52) capable of moving in the axial direction, and the product ejector pin (51) and the balancing ejector pin (52) are both perpendicular to the rear mold core (12).

4. The rapid injection molding mold according to claim 3, characterized in that: The product ejector pin (51) is located below the balancing ejector pin (52), and the balancing ejector pin (52) is coaxial with the hot nozzle body (3).

5. The rapid injection molding mold according to claim 1, characterized in that: A clearance groove (14) is provided on a side of the rear mold plate (11) close to the front mold plate (21); the clearance groove (14) is located below the rear mold core (12); and the depth of the clearance groove (14) is greater than the maximum external dimension of the product.

6. The rapid injection molding mold according to claim 1, characterized in that: The rear mold core (12) and the front mold core (22) are close to the ground side of the mold, and a rear mold balancing block (13) is fixedly mounted on the rear mold plate (11), the rear mold balancing block (13) is located above the rear mold core (12), and a front mold balancing block (23) corresponding to the position of the rear mold balancing block (13) is fixedly mounted on the front mold plate (21).

7. The rapid injection molding mold according to claim 6, characterized in that: An air path (7) is provided inside the rear mold balancing block (13), and a plurality of air outlets (71) are provided on a side of the rear mold balancing block (13) close to the rear mold core (12), and one end of the air outlets (71) is communicated with the air path (7).

8. The rapid injection molding mold according to claim 1, characterized in that: A water channel (6) surrounding the mold cavity (8) is arranged inside the rear mold core (12), and a plurality of water stoppers (61) for limiting the flow direction of cooling water are fixedly installed inside the water channel (6).

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