Mold beneficial to balancing injection molding flow velocity

Abstract

The utility model discloses a mould beneficial to balancing injection flow velocity, which relates to the technical field of moulds and comprises an upper mould and a lower mould corresponding to the upper mould, the upper mould is provided with an upper mould core, the lower mould is provided with a lower mould core, and the upper mould is matched with the lower mould in a butt joint manner, so that the upper mould core and the lower mould core are in butt joint to form a mould cavity for forming a product; the upper mold is provided with a glue feeding system, the glue feeding system comprises a hot nozzle, a first-stage runner connected to the hot nozzle and a second-stage runner connected to the first-stage runner, the first-stage runner is formed on the surface of the upper mold core, and the second-stage runner penetrates through the upper mold core and is in butt joint with the mold cavity; a fixing seat corresponding to the hot nozzle is arranged in the upper mold and located on the surface of the upper mold core, a flow limiting piece is fixedly arranged on the fixing seat, the lower end of the flow limiting piece penetrates through the fixing seat and is in butt joint with a flow channel connector of the first-stage flow channel and the second-stage flow channel, and at least part of the lower end of the flow limiting piece stretches in along the second-stage channel; therefore, the flow velocity of the molten plastic is effectively slowed down.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a mold which is beneficial to balancing the injection molding flow rate. Background Art

[0002] Molds are various molds and tools used in industrial production to obtain the desired products by injection molding, blow molding, extrusion, die casting or forging molding, smelting, stamping and other methods. In short, molds are tools used to make molded objects. This tool is composed of various parts, and different molds are composed of different parts. It mainly realizes the surface processing of objects by changing the physical state of the molded material, and is known as the "mother of industry". Injection molds are tools for producing plastic products. Generally, injection molds are composed of an upper mold and a lower mold. During injection molding, the upper mold and the lower mold are closed to form a runner system and a mold cavity for plastic products. During injection molding, the mold is clamped on the injection molding machine, and the molten plastic is injected into the mold cavity and cooled and formed in the mold cavity. At the same time, the molten plastic is also cooled in the runner system to form a runner system condensate. After the plastic product is formed, the upper mold and the lower mold are separated, and the plastic product is ejected from the mold cavity through the ejection system and leaves the mold. Finally, the upper mold and the lower mold are closed again for the next injection molding. The entire injection molding process is carried out in a cycle.

[0003] As an important process in modern manufacturing, injection mold technology is widely used in the production of various plastic products. In the injection molding process, the flow rate of molten plastic is a key parameter, which has an important impact on the quality and performance of the product. In the current field of injection mold technology, the excessive flow rate of molten plastic is a common problem that has not been effectively solved. When the flow rate of molten plastic exceeds the reasonable range, it will bring a series of adverse effects to the injection molded product, such as flash (burrs), bubbles and voids, surface flow marks, etc.

[0004] Therefore, it is necessary to propose an improved technical solution to solve the above problems. Utility Model Content

[0005] The utility model aims to overcome the above-mentioned shortcomings and provide a technical solution that can solve the above-mentioned problems.

[0006] A mold that is conducive to balancing the injection molding flow rate, comprising an upper mold and a corresponding lower mold, wherein the upper mold has an upper mold core, and the lower mold has a lower mold core, and the upper mold and the lower mold are butt-jointed to form a mold cavity for molding a product;

[0007] The upper mold is provided with a glue feeding system, which includes a hot nozzle, a primary flow channel connected to the hot nozzle, and a secondary flow channel connected to the primary flow channel, wherein the primary flow channel is formed on the surface of the upper mold core, and the secondary flow channel passes through the upper mold core and docks with the mold cavity;

[0008] A fixing seat corresponding to the hot nozzle is arranged inside the upper mold and on the surface of the upper mold core, and a flow limiting component is fixed on the fixing seat. The lower end of the flow limiting component passes through the fixing seat and is connected to the flow channel interface between the primary flow channel and the secondary flow channel, wherein the lower end of the flow limiting component at least partially extends along the secondary channel.

[0009] As a further solution of the utility model: the flow limiting component includes a main body and a buffer end connected to the lower end of the main body, the diameter of the buffer end is smaller than the caliber of the secondary flow channel, the buffer end extends into the secondary flow channel, and forms a passage between the buffer end and the secondary flow channel.

[0010] As a further solution of the utility model: the upper end of the buffer end is gradually expanded along the lower end thereof, so that the diameter of the passageway is gradually reduced.

[0011] As a further solution of the utility model: the cross-section of the buffer end is a trapezoidal structure.

[0012] As a further solution of the utility model: the buffer end includes a first connecting column connected to the lower end of the main body and a second connecting column connected to the lower end of the first connecting column, and the diameter of the first connecting column is smaller than the diameter of the second connecting column, so that a step is formed between the main body and the second connecting column;

[0013] A first buffer groove is formed between the secondary flow channel and the first connecting column, and a second buffer groove is formed between the secondary flow channel and the second connecting column.

[0014] As a further solution of the utility model: the buffer end also includes a third connecting post connected to the lower end of the second connecting post and a fourth connecting post connected to the lower end of the third connecting post, and the diameter of the third connecting post is smaller than the diameter of the second connecting post and the diameter of the fourth connecting post, so that a step is formed between the second connecting post and the fourth connecting post;

[0015] A third buffer groove is formed between the secondary flow channel and the third connecting column, and a fourth buffer groove is formed between the secondary flow channel and the fourth connecting column. The first buffer groove, the second buffer groove, the third buffer groove and the fourth buffer groove are connected in sequence to form the passage.

[0016] As a further solution of the present invention: the upper end of the second connecting column / the fourth connecting column is gradually reduced in diameter along the lower end thereof.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] By providing a flow limiting member corresponding to the injection molding runner, in particular, the flow limiting member can be connected to the runner interface of the primary runner and the secondary runner, and the lower end of the flow limiting member can at least partially extend into the secondary runner, so that the lower end of the flow limiting member can occupy a certain runner space of the secondary runner, so that the effective cross-sectional area of ​​the secondary runner is reduced, and the molten plastic can be partially blocked when flowing from the primary runner to the secondary runner, thereby effectively slowing down the flow rate of the molten plastic from the secondary runner to the mold cavity, so that after the flow rate of the molten plastic is slowed down, it can fill the mold cavity more evenly, reduce defects such as bubbles, short shots, weld marks, etc., and improve the appearance quality and mechanical properties of the product.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a schematic diagram of the structure of the upper die core, the lower die core and the glue feeding system of the utility model;

[0022] Figure 2 yes Figure 1 A schematic diagram of the structure in which the fixing seat is removed;

[0023] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 4 This is a schematic diagram of the structure of the current limiting component of Embodiment 1 of the utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the current limiting component of Embodiment 2 of the present utility model;

[0026] Figure 6 It is a cross-sectional structural diagram of the cooperation of the upper die core, the lower die core and the glue feeding system in Embodiment 2 of the present utility model;

[0027] Figure 7 yes Figure 6 Schematic diagram of the enlarged structure at point B in the middle.

[0028] The reference numerals and names in the figures are as follows:

[0029] 1. Upper mold core; 2. Lower mold core; 3. Glue feeding system; 4. Hot nozzle; 5. Primary runner; 6. Secondary runner; 7. Fixed seat; 8. Flow limiting component; 9. Runner interface; 10. Buffer end; 11. Aisle; 12. First connecting column; 13. Second connecting column; 14. First buffer groove; 15. Second buffer groove; 16. Third connecting column; 17. Fourth connecting column; 18. Third buffer groove; 19. Fourth buffer groove; 20. Main body. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] See also Figure 1-7 In an embodiment of the utility model, a mold that is conducive to balancing the injection molding flow rate includes an upper mold and a corresponding lower mold, the upper mold has an upper mold core 1, the lower mold has a lower mold core 2, and the upper mold and the lower mold are butt-jointed to form a mold cavity for molding products;

[0032] The upper mold is provided with a glue feeding system 3, and the glue feeding system 3 includes a hot nozzle 4, a primary flow channel 5 connected to the hot nozzle 4, and a secondary flow channel 6 connected to the primary flow channel 5, wherein the primary flow channel 5 is formed on the surface of the upper mold core 1, and the secondary flow channel 6 passes through the upper mold core 1 and docks with the mold cavity;

[0033] A fixing seat 7 corresponding to the hot nozzle 4 is provided inside the upper mold and on the surface of the upper mold core 1, and a flow limiting component 8 is fixed on the fixing seat 7. The lower end of the flow limiting component 8 passes through the fixing seat 7 and is connected to the flow channel interface 9 of the primary flow channel 5 and the secondary flow channel 6, wherein the lower end of the flow limiting component 8 at least partially extends along the secondary channel.

[0034] In the technical scheme of the utility model, a flow limiting member 8 corresponding to the injection molding runner is provided, and in particular, the flow limiting member 8 can be connected to the runner interface 9 of the primary runner 5 and the secondary runner 6, and the lower end of the flow limiting member 8 can at least partially extend into the secondary runner 6, so that the lower end of the flow limiting member 8 can occupy a certain runner space of the secondary runner 6, so that the effective cross-sectional area of ​​the secondary runner 6 is reduced, and the molten plastic can be partially blocked when flowing from the primary runner 5 to the secondary runner 6, thereby effectively slowing down the flow rate of the molten plastic from the secondary runner 6 to the mold cavity, so that after the flow rate of the molten plastic is slowed down, it can fill the mold cavity more evenly, reduce defects such as bubbles, short shots, and weld marks, and improve the appearance quality and mechanical properties of the product.

[0035] The flow limiting member 8 may be a cylindrical structure.

[0036] In an embodiment of the utility model, the flow limiting component 8 includes a main body 20 and a buffer end 10 connected to the lower end of the main body 20. The diameter of the buffer end 10 is smaller than the caliber of the secondary flow channel 6. The buffer end 10 extends into the secondary flow channel 6 and forms a passage 11 between the buffer end 10 and the secondary flow channel 6.

[0037] By setting the buffer end 10, a spatial obstruction is caused to the secondary runner 6 at the runner interface 9 between the primary runner 5 and the secondary runner 6. Then, through the formed spatial obstruction, the flow channel of the secondary runner 6 at the runner interface 9 becomes narrower, thereby balancing / buffering the flow rate of the molten plastic that is too fast. At the same time, through the setting of the formed passage 11, the molten plastic is allowed to enter the secondary runner 6 and even the mold cavity along the passage 11, thereby realizing the injection molding of the product.

[0038] Example 1, please refer to Figure 4 :

[0039] The upper end of the buffer end 10 is gradually expanded along the lower end thereof, so that the diameter of the passage 11 is gradually reduced; the cross section of the buffer end 10 is a trapezoidal structure.

[0040] In Example 1, the buffer end 10 is a generally cylindrical structure with a trapezoidal cross section, so that the diameter of the passage 11 gradually decreases, that is, the resistance to the molten plastic gradually increases, thereby effectively enhancing the effect of slowing down the flow rate of the molten plastic.

[0041] Example 2, please refer to Figure 5-7 :

[0042] The buffer end 10 includes a first connecting column 12 connected to the lower end of the main body 20 and a second connecting column 13 connected to the lower end of the first connecting column 12. The diameter of the first connecting column 12 is smaller than the diameter of the second connecting column 13, so that a step is formed between the main body 20 and the second connecting column 13.

[0043] A first buffer groove 14 is formed between the secondary flow channel 6 and the first connecting column 12 , and a second buffer groove 15 is formed between the secondary flow channel 6 and the second connecting column 13 .

[0044] In Example 2, the buffer end 10 is a structure that can have a buffer groove, by sequentially connecting two columns of different diameters at the lower end of the main body 20, the two main bodies 20, namely the first connecting column 12 and the second connecting column 13, have diameters smaller than the diameter of the main body 20, and a first buffer groove 14 with a larger capacity is formed through the aisle 11 combined with the step position, and a second buffer groove 15 with a slightly smaller capacity is formed through the remaining aisle 11, so that through the combination of the first buffer groove 14 and the second buffer groove 15, the molten plastic entering the secondary flow channel 6 can be buffered, thereby effectively enhancing the effect of slowing down the flow rate of the molten plastic.

[0045] Furthermore, the buffer end 10 further includes a third connecting post 16 connected to the lower end of the second connecting post 13 and a fourth connecting post 17 connected to the lower end of the third connecting post 16, wherein the diameter of the third connecting post 16 is smaller than the diameter of the second connecting post 13 and the diameter of the fourth connecting post 17, so that a step is formed between the second connecting post 13 and the fourth connecting post 17;

[0046] A third buffer groove 18 is formed between the secondary flow channel 6 and the third connecting column, and a fourth buffer groove 19 is formed between the secondary flow channel 6 and the fourth connecting column 17. The first buffer groove 14, the second buffer groove 15, the third buffer groove 18 and the fourth buffer groove 19 are connected in sequence to form the passage 11.

[0047] The principle is the same as that of the first connecting column 12 and the second connecting column 13, and will not be elaborated here.

[0048] Furthermore, the upper end of the second connecting column 13 / the fourth connecting column 17 is gradually reduced in diameter along the lower end thereof.

[0049] This arrangement facilitates the molten plastic to flow from one buffer groove into another buffer groove along the inclined wall, thereby achieving the effect of slowing down the flow rate of the molten plastic without hindering the fluidity of the molten plastic.

[0050] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A mold that is conducive to balancing the injection molding flow rate, characterized in that: It includes an upper mold and a corresponding lower mold, wherein the upper mold has an upper mold core, and the lower mold has a lower mold core, and the upper mold and the lower mold are butted together to form a mold cavity for molding products; The upper mold is provided with a glue feeding system, which includes a hot nozzle, a primary flow channel connected to the hot nozzle, and a secondary flow channel connected to the primary flow channel, wherein the primary flow channel is formed on the surface of the upper mold core, and the secondary flow channel passes through the upper mold core and docks with the mold cavity; A fixing seat corresponding to the hot nozzle is arranged inside the upper mold and on the surface of the upper mold core, and a flow limiting component is fixed on the fixing seat. The lower end of the flow limiting component passes through the fixing seat and is connected to the flow channel interface between the primary flow channel and the secondary flow channel, wherein the lower end of the flow limiting component at least partially extends along the secondary channel.

2. A mold for balancing injection molding flow rate according to claim 1, characterized in that: The flow limiting component includes a main body and a buffer end connected to the lower end of the main body. The diameter of the buffer end is smaller than the caliber of the secondary flow channel. The buffer end extends into the secondary flow channel and forms a passage between the buffer end and the secondary flow channel.

3. A mold for balancing injection molding flow rate according to claim 2, characterized in that: The upper end of the buffer end is gradually expanded along the lower end thereof, so that the diameter of the passage is gradually reduced.

4. A mold for balancing injection molding flow rate according to claim 3, characterized in that: The cross section of the buffer end is a trapezoidal structure.

5. A mold for balancing injection molding flow rate according to claim 2, characterized in that: The buffer end includes a first connecting column connected to the lower end of the main body and a second connecting column connected to the lower end of the first connecting column, wherein the diameter of the first connecting column is smaller than the diameter of the second connecting column, so that a step is formed between the main body and the second connecting column; A first buffer groove is formed between the secondary flow channel and the first connecting column, and a second buffer groove is formed between the secondary flow channel and the second connecting column.

6. A mold for balancing injection molding flow rate according to claim 5, characterized in that: The buffer end further includes a third connecting post connected to the lower end of the second connecting post and a fourth connecting post connected to the lower end of the third connecting post, wherein the diameter of the third connecting post is smaller than the diameter of the second connecting post and the diameter of the fourth connecting post, so that a step is formed between the second connecting post and the fourth connecting post; A third buffer groove is formed between the secondary flow channel and the third connecting column, and a fourth buffer groove is formed between the secondary flow channel and the fourth connecting column. The first buffer groove, the second buffer groove, the third buffer groove and the fourth buffer groove are connected in sequence to form the passage.

7. A mold for balancing injection molding flow rate according to claim 6, characterized in that: The upper end of the second connecting column / the fourth connecting column is gradually reduced in diameter along the lower end thereof.

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