Water gap cooling structure of injection mold

Abstract

The utility model discloses an injection mold water gap cooling structure which comprises an upper mold base and a lower mold base, a sprue gate is arranged on the upper mold base, a flow dividing piece communicated with the sprue gate is arranged in the upper mold base, a hot runner is connected to the bottom of the flow dividing piece, an upper mold core is arranged at the bottom of the upper mold base, a lower mold core is arranged at the top of the lower mold base, and the upper mold core and the lower mold core are combined to form a cavity. The hot runner penetrates through the upper mold core and is used for injecting an injection molding raw material to enable the raw material to form a product in the mold cavity, the bottom of the hot runner is sleeved with a water conveying sleeve, a gap is reserved between the water conveying sleeve and the hot runner to form a cooling channel, a water circulating pipeline is arranged on the upper mold base, and a water inlet hole and a water outlet hole are formed in the water conveying sleeve; cooling water is input into the cooling channel through the water circulating pipeline, the cooling water absorbs heat of the hot runner, the temperature of a pouring gate area of the hot runner is reduced, the problems of product bulging and deformation caused by local overheating are avoided, and the cooling water absorbing heat is discharged from the water outlet hole.

Description

TECHNICAL FIELD

[0001] The utility model belongs to injection mold technical field, and specifically is a kind of injection mold water gap cooling structure. BACKGROUND

[0002] In traditional injection mold, cold runner system produces a large amount of runner waste due to simultaneous cooling of runner and product, and needs additional process to remove, resulting in material waste and efficiency reduction, while hot runner mold keeps plastic in molten state in runner by embedding heating element to avoid cold runner solidification problem, thereby reducing waste rate, shortening molding cycle and reducing production cost, especially suitable for mass production of precision injection molding parts.

[0003] However, the heat of the existing hot runner cannot be dissipated in time after the product is formed, resulting in excessively high temperature in the gate area, which easily causes product deformation or surface defects, affecting product quality. INVENTION CONTENTS

[0004] The utility model is to provide a kind of injection mold water gap cooling structure to solve the problems raised in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A kind of injection mold water gap cooling structure, including upper die holder and lower die holder, the upper die holder is equipped with pouring port, the upper die holder is equipped with shunt with pouring port in communication, the shunt bottom is connected with hot runner, the upper die holder bottom is equipped with upper die core, the lower die holder top is equipped with lower die core, the upper die core and lower die core are combined to form cavity, the hot runner penetrates upper die core, for injecting injection raw material to make raw material form product in cavity, the bottom of hot runner is equipped with water-carrying sleeve, the water-carrying sleeve and hot runner are left gap and form cooling channel, the upper die holder is equipped with water circulation pipeline, the water-carrying sleeve is equipped with water inlet hole and water outlet hole, cooling channel and water circulation pipeline are communicated by water inlet hole and water outlet hole.

[0007] Further, the bottom of the upper die core is provided with a molding groove, and an arc protrusion is arranged on the outer edge of the bottom of the molding groove.

[0008] Further, the two side edges of the product are provided with upwardly protruding thick bone positions, a lower groove is arranged between the bottom of the product and the thick bone positions, and a lower protruding portion for molding the lower groove is arranged on the two side edges of the bottom of the upper die core.

[0009] Further, the upper die seat is provided with a movable hole, a top plate is movably connected in the movable hole, a plurality of guide columns are provided through the top plate, two ends of the guide columns are fixedly connected with the top and bottom of the movable hole respectively, a plurality of round top pins and inclined top assemblies penetrating the upper die core are arranged on the lower end surface of the top plate, the inclined top assemblies are matched with the upper die core for product forming, and the round top pins abut against the upper end surface of the product.

[0010] Further, the top plate extends to the outside of the movable hole on both sides, four telescopic devices are symmetrically installed on the outer wall of the upper die seat, and telescopic ends of the four telescopic devices all extend upwards to penetrate the top plate and are fixedly connected with the top plate.

[0011] Further, the plurality of inclined top assemblies each comprise an inclined top seat, a rolling shaft is rotatably connected on the inclined top seat, an inclined top rod is installed on the rolling shaft, and an inclined top core head is installed on the inclined top rod, the bottom of the inclined top core head abuts against the upper end surface of the product, and a reverse buckle groove for product forming is arranged on the side surface of the inclined top core head.

[0012] The utility model discloses beneficial effects:

[0013] The utility model discloses a water circulating pipeline is arranged between the heat flow channel and the cooling channel, and the cooling water in the water circulating pipeline is used for absorbing the heat of the heat flow channel, thereby reducing the temperature of the heat flow channel gate area, avoiding the problems of product bulging and surface deformation caused by local overheating, reducing the generation of defective products, and finally discharging the cooling water after absorbing heat from the other end of the water circulating pipeline.

[0014] Other features and advantages of the utility model will be described in detail in the subsequent specific implementation manner part. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The utility model discloses a whole structure diagram.

[0016] Figure 2 The utility model discloses upper die seat and lower die seat explosion Figure 1 .

[0017] Figure 3 The utility model discloses upper die seat and lower die seat explosion Figure 2 .

[0018] Figure 4 The utility model discloses upper die seat explosion Figure 1 .

[0019] Figure 2 The utility model discloses upper die seat explosion Figure 6 .

[0020] Figure 7The inclined top assembly structure diagram of the utility model.

[0021] Figure 8 The sectional view of the utility model.

[0022] Figure 7 : Figure 9 The structure enlarged view of the local A.

[0023] Figure 10 The product structure diagram of the utility model.

[0024] Figures 1-10 The upper die core structure diagram of the utility model.

[0025] Reference signs: 1, upper die holder, 2, lower die holder, 3, pouring gate, 4, flow dividing piece, 5, hot runner, 6, upper die core, 7, lower die core, 8, product, 11, water circulation pipeline, 12, movable hole, 13, top plate, 14, guide column, 15, round top needle, 16, inclined top assembly, 17, telescopic device, 51, water conveying sleeve, 52, cooling channel, 53, water inlet hole, 54, water outlet hole, 61, forming groove, 62, circular arc convex, 63, lower protruding part, 81, thick bone site, 82, lower groove, 161, inclined top base, 162, rolling shaft, 163, inclined top rod, 164, inclined top core head, 165, reverse buckle groove. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0027] Please refer to ​ ;

[0028] The injection mold water gap cooling structure comprises an upper mold base 1 and a lower mold base 2, the upper mold base 1 is provided with a pouring gate 3, the inside of the upper mold base 1 is provided with a flow divider 4 in communication with the pouring gate 3, the bottom of the flow divider 4 is connected with a hot runner 5, the bottom of the upper mold base 1 is provided with an upper mold core 6, the top of the lower mold base 2 is provided with a lower mold core 7, the upper mold core 6 and the lower mold core 7 are combined to form a cavity, the hot runner 5 penetrates through the upper mold core 6, specifically, after the injection material is injected through the pouring gate 3, the material flows into the hot runner 5 through the flow divider 4, enters the cavity through the hot runner 5, and the material is cooled and formed in the cavity to form a product 8, the bottom of the hot runner 5 is sleeved with a water conveying sleeve 51, a gap is left between the water conveying sleeve 51 and the hot runner 5 to form a cooling channel 52, cooling water is injected into the cooling channel 52, the cooling water can effectively absorb part of the heat of the hot runner 5, thereby reducing the temperature of the mold pouring gate area, avoiding the problems of product bulging, surface deformation and the like caused by local overheating, the upper mold base 1 is provided with a water circulation pipeline 11, the water conveying sleeve 51 is provided with a water inlet hole 53 and a water outlet hole 54, the cooling channel 52 and the water circulation pipeline 11 are communicated through the water inlet hole 53 and the water outlet hole 54, the water circulation pipeline 11 is connected with an external water circulation device, the external water circulation device can input cooling water from one end of the water circulation pipeline 11, the input cooling water enters the cooling channel 52 through the water inlet hole 53, after absorbing the heat of the hot runner 5 in the cooling channel 52, the cooling water is discharged back to the water circulation pipeline 11 through the water outlet hole 54, and flows back to the external water circulation device from the other end of the water circulation pipeline 11, the external water circulation device cools the water absorbing heat, and then circulates and outputs again, realizing the continuous circulation of the cooling water.

[0029] In the embodiment, the bottom of the upper mold core 6 is provided with a forming groove 61 for forming a vertical edge of the product 8, and the bottom outer edge of the forming groove 61 is provided with a circular arc protrusion 62 for forming a circular groove at the bottom corner of the vertical edge of the product 8, so that the product 8 can effectively disperse stress when demolding, avoiding the shear force caused by the right-angle edge, thereby reducing the demolding resistance and making the demolding process more smooth.

[0030] In the embodiment, the two side outer edges of the product 8 are provided with upward protruding thick bone positions 81, and the bottom of the product 8 is provided with a lower groove 82 between the thick bone positions 81, and the bottom of the upper mold core 6 is provided with a lower protruding part 63 for forming the lower groove 82, when the product 8 is formed, some areas are thicker than other areas, the cooling speed of these thick areas will be slower, causing them to continue to shrink during the cooling process, thereby pulling the surrounding material, causing the surface to appear concave or shrink marks, by providing the lower groove 82 at the thick bone position 81, the thickness of the material in this area can be reduced, so that the cooling speed is more uniform, thereby reducing the occurrence of surface shrinkage.

[0031] In the embodiment, the upper die seat 1 is provided with a movable hole 12, a top plate 13 is movably connected in the movable hole 12, a plurality of guide columns 14 are provided through the top plate 13, and the two ends of the guide columns 14 are fixedly connected with the top and bottom of the movable hole 12 respectively, so as to ensure that the top plate 13 can stably move up and down along the guide columns 14, and the lower end surface of the top plate 13 is provided with a plurality of round top pins 15 and inclined top assemblies 16 penetrating the upper die core 6, the round top pins 15 abut against the upper end surface of the product 8, and the inclined top assemblies 16 cooperate with the upper die core 6 to be used for forming the product 8, and after the mold is opened, the product 8 can be pushed out downward by controlling the top plate 13 to move downward and cooperating with the round top pins 15.

[0032] In the embodiment, the top plate 13 extends to the outside of the movable hole 12 on both sides, four telescopic devices 17 are symmetrically installed on the outer wall of the upper die seat 1, the telescopic ends of the four telescopic devices 17 all extend upward to penetrate the top plate 13 and are fixedly connected with the top plate 13, preferably, the telescopic device 17 is a common telescopic rod on the market, and the four telescopic devices 17 are controlled to be synchronously telescoped by a control system, so as to drive the top plate 13 to move up and down.

[0033] In the embodiment, the plurality of inclined top assemblies 16 each include an inclined top seat 161, a rolling shaft 162 is rotatably connected on the inclined top seat 161, an inclined top rod 163 is installed on the rolling shaft 162, and an inclined top core head 164 is installed on the inclined top rod 163, the bottom of the inclined top core head 164 abuts against the upper end surface of the product 8, and a reverse buckling groove 165 for forming the product 8 is arranged on the side surface of the inclined top core head 164, so as to meet the needs of forming the reverse buckling of the product 8, since the inclined top rod 163 is rotatably connected on the inclined top seat 161 through the rolling shaft 162, when the inclined top assembly 16 cooperates with the round top pin 15 to push out the product 8, the inclined top rod 163 can smoothly separate from the reverse buckling part of the product 8 by means of the inclined movement, so as to effectively avoid that the product 8 is pulled and damaged.

[0034] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0035] Furthermore, it should be understood that although the description is made according to the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and the person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be combined appropriately to form other embodiments that can be understood by the person skilled in the art.

Claims

1. A sprue cooling structure for an injection mold, comprising an upper mold base (1) and a lower mold base (2), wherein the upper mold base (1) is provided with a sprue (3), characterized in that, The upper mold base (1) is provided with a flow divider (4) communicating with the gating port (3). The bottom of the flow divider (4) is connected to a hot runner (5). The bottom of the upper mold base (1) is provided with an upper mold core (6). The top of the lower mold base (2) is provided with a lower mold core (7). The upper mold core (6) and the lower mold core (7) are combined to form a cavity. The hot runner (5) penetrates the upper mold core (6) and is used to inject injection molding material so that the material forms a product in the cavity. 8) The bottom of the hot runner (5) is fitted with a water jacket (51), and a gap is left between the water jacket (51) and the hot runner (5) to form a cooling channel (52). The upper mold base (1) is provided with a water circulation pipe (11), and the water jacket (51) is provided with a water inlet hole (53) and a water outlet hole (54). The cooling channel (52) and the water circulation pipe (11) are connected through the water inlet hole (53) and the water outlet hole (54).

2. The injection mold gate cooling structure according to claim 1, characterized in that, The bottom of the upper mold core (6) is provided with a forming groove (61), and the bottom outer edge of the forming groove (61) is provided with an arc protrusion (62).

3. The injection mold gate cooling structure according to claim 1, characterized in that, The product (8) has upwardly protruding thick bone positions (81) on both outer edges, and a lower groove (82) is provided between the bottom of the product (8) and the thick bone positions (81). The upper mold core (6) has lower protrusions (63) on both outer edges of its bottom for forming the lower groove (82).

4. The injection mold gate cooling structure according to claim 1, characterized in that, The upper mold base (1) is provided with a movable hole (12), and a top plate (13) is movably connected in the movable hole (12). Several guide pillars (14) are provided on the top plate (13). The two ends of the guide pillars (14) are fixedly connected to the top and bottom of the movable hole (12) respectively. Several round pins (15) and inclined ejector components (16) penetrating the upper mold core (6) are provided on the lower end face of the top plate (13). The inclined ejector components (16) cooperate with the upper mold core (6) for product (8) molding. The round pins (15) abut against the upper end face of the product (8).

5. The injection mold gate cooling structure according to claim 4, characterized in that, The top plate (13) extends to the outside of the movable hole (12) on both sides. Four telescopic devices (17) are symmetrically installed on both sides of the outer wall of the upper mold base (1). The telescopic ends of the four telescopic devices (17) extend upward to pass through the top plate (13) and are fixedly connected to the top plate (13).

6. The injection mold gate cooling structure according to claim 4, characterized in that, Each of the aforementioned inclined top components (16) includes an inclined top seat (161), on which a rolling shaft (162) is rotatably connected. An inclined top rod (163) is mounted on the rolling shaft (162), and an inclined top core (164) is mounted on the inclined top rod (163). The bottom of the inclined top core (164) abuts against the upper end face of the product (8), and the side of the inclined top core (164) is provided with an undercut groove (165) for forming the product (8).

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