Injection mold structure

Abstract

The utility model relates to injection equipment technical field more specifically, relate to a kind of injection mold structure, including first mould and second mould and insert, first mould and second mould are separately provided with the first cavity and second cavity that can be spliced, the one side of first mould is set as mold closing face, installation groove for installing insert is opened in mold closing face, first runner is opened in first mould, second runner is provided on the insert and is connected with first runner, gate is opened in the insert and is connected first cavity and second runner, insert protrudes from mold closing face, the plane where mold closing face is located bisects gate, second mould is further provided with butt joint groove, butt joint groove and insert protruding from mold closing face portion are spliced.The utility model sets up gate position in mold closing seam center, solves the problem, such as uneven melt flow, fusion mark exposure and surface defect in traditional mould.

Description

Technical Field

[0001] This utility model relates to the field of injection molding equipment technology, and more specifically, to an injection mold structure. Background Technology

[0002] Injection molding, as one of the most widely used plastic processing technologies in modern manufacturing, directly determines the molding quality and production efficiency of the finished product due to the rationality of its mold design. In traditional injection mold design, the mold is generally divided into two parts, which are then joined together and injection is carried out through a gate. A parting line is formed at the joint of the two parts. To ensure the integrity of the gate, it is usually placed on one side of the two parts of the mold. This design means that the gate position is usually offset from the center axis of the parting line. Although this asymmetrical gate layout can simplify the mold structure in some cases, it can cause unbalanced flow of the melt in the cavity. Specifically, when the gate is offset from the center of the parting line, the melt will form an asymmetrical flow path during filling. The melt closer to the gate side fills first due to lower flow resistance, while the melt farther away from the gate side lags behind due to the flow difference. This flow difference will cause a significant flow deviation of the melt front. Uneven flow not only causes uneven pressure distribution at the end of the cavity, but also creates weld lines exposed on the product's surface at the melt convergence point, severely affecting the product's appearance quality. Furthermore, differences in flow paths can create dead zones at the far end of the cavity that are difficult to fill completely, leading to molding defects such as short shots and shrinkage marks. Additionally, because the gate deviates from the mold opening, the parting line will deviate from the weld line, resulting in product appearance defects and increasing the workload of post-processing. Utility Model Content

[0003] To address the technical problems of unreasonable gate design in existing technologies, which can easily lead to flow deviation, dead corners, and exposed weld lines on the product's surface, this utility model provides an injection mold structure that sets the gate position at the center of the mold closing seam, thus solving problems such as uneven melt flow, exposed weld lines, and surface defects in traditional molds.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an injection mold structure, including a first mold and a second mold and an insert, wherein the first mold and the second mold are respectively provided with a first cavity and a second cavity that can be assembled, the side of the first mold with the first cavity is a mold closing surface, the mold closing surface is provided with an installation groove for installing the insert, the first mold is provided with a first runner, the insert is provided with a second runner that communicates with the first runner, the insert is provided with a gate that communicates with the first cavity and the second runner, the insert protrudes from the mold closing surface, the plane of the mold closing surface bisects the gate, the second mold is also provided with a mating groove, the mating groove is assembled with the part of the insert that protrudes from the mold closing surface.

[0005] In this technical solution, the first mold and the second mold are combined to form a complete mold. The first mold has a first cavity, and the second mold has a second cavity. The first cavity and the second cavity are combined to form a closed space to define the external shape of the product. During injection molding, the raw material is injected into this closed space, and after the raw material cools and solidifies, the product is formed. Then, the first mold and the second mold are separated, allowing the closed space to be reopened, and the product can be directly removed by the operator. The side of the first mold that is combined with the second mold is the parting surface. After the first mold and the second mold are combined, a parting seam is formed at the parting surface, and a parting line is formed on the product at the parting seam. The first mold has an installation groove, in which an insert is installed. The first mold has a first runner, and the insert has a second runner. The first runner and the second runner are connected. The gate is located on the insert and connects the second runner to the first cavity. The raw material can be injected into the first mold through the first runner and finally injected into the first cavity through the second runner and the gate. After the insert is installed in the mounting slot, its top protrudes from the parting surface. The gate on the insert is precisely bisected by the plane of the parting surface, and the gate position is exactly on the parting line. At this point, the first and second cavities are symmetrically distributed on both sides of the gate, avoiding differences in material flow rate between the first and second cavities due to gate eccentricity. This ensures that the weld line after the material solidifies naturally forms at the parting seam, coinciding with the parting line of the product, preventing exposure and affecting the appearance. At the same time, uniform melt filling reduces stress concentration, improves the structural strength of the product, and avoids flow deviation and dead corners. The part of the insert that is higher than the parting surface provides space for the gate, ensuring the integrity of the gate. On the other hand, this part can be joined with the mating groove on the second mold, thereby fixing the relative position between the first and second molds.

[0006] Preferably, the second flow channel includes an upper half-groove, a lower half-groove, and a connecting channel. The lower half-groove is disposed on the upper surface of the insert and is connected to the gate. The upper half-groove is disposed on the lower surface of the second mold. The upper half-groove and the lower half-groove are joined together to form a closed flow channel. The connecting channel is disposed on the first mold, and the two ends of the connecting channel are respectively connected to the lower half-groove and the first flow channel.

[0007] Preferably, a positioning structure is also provided between the first mold and the second mold.

[0008] Preferably, the positioning structure includes a positioning block and a positioning groove. The positioning block is disposed on the mold closing surface, and the positioning groove is formed on the side of the second mold facing the first mold. The positioning groove is inserted into the positioning block.

[0009] Preferably, at least two positioning blocks are provided, and the two positioning blocks are respectively provided on opposite sides of the first mold, and the number and position of the positioning grooves correspond to the positioning blocks.

[0010] Preferably, the insert is provided with an mounting structure, and the insert is detachably connected to the first mold through the mounting structure.

[0011] Preferably, the mounting structure is a mounting hole that penetrates the insert. The bottom of the mounting groove is also provided with a threaded hole. A fastening bolt is inserted into the mounting hole, and the fastening bolt is sequentially inserted into the mounting hole and the threaded hole and threadedly connected to the threaded hole.

[0012] Preferably, the mounting hole is a countersunk hole structure.

[0013] Preferably, the insert protrudes from the mold-closing surface in a cross-shaped structure, and the shape of the mating groove matches the shape of the portion of the insert protruding from the mold-closing surface.

[0014] Preferably, the first mold has at least two first cavities, which are located on both sides of the mounting groove and connected to the mounting groove. The number and position of the gates on the insert match the number and position of the first cavities, and the number and position of the second cavities match the number and position of the first cavities.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: In this utility model, the gate is set on the parting line between the first mold and the second mold, avoiding the difference in raw material flow rate between the first cavity and the second cavity due to gate eccentricity. This allows the weld line after the final raw material solidifies to naturally form at the parting seam, coinciding with the product parting line, avoiding exposure and affecting the appearance. At the same time, the uniform filling of the melt reduces stress concentration, improves the structural strength of the product, and avoids flow deviation and dead corners. The upper end of the insert is higher than the parting surface, which provides space for opening the gate and ensures the integrity of the gate. On the other hand, the part higher than the parting surface can be matched with the mating groove on the second mold, thereby fixing the relative position between the first mold and the second mold. Attached Figure Description

[0016] Figure 1 This is an exploded view of the injection mold structure of this utility model;

[0017] Figure 2 This is a sectional view of the injection mold structure of this utility model;

[0018] Figure 3 This is a three-dimensional view of the insert in the injection mold structure of this utility model.

[0019] In the attached diagram: 1. First mold; 2. Second mold; 3. Insert; 11. First cavity; 12. Mounting groove; 13. Positioning block; 14. Mold parting surface; 15. First runner; 16. Threaded hole; 21. Second cavity; 22. Positioning groove; 23. Butt groove; 31. Second runner; 32. Gate; 33. Mounting hole; 311. Upper half groove; 312. Lower half groove; 313. Connecting channel. Detailed Implementation

[0020] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0021] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0022] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0023] Example 1

[0024] like Figure 1 , 2As shown, an injection mold structure includes a first mold 1, a second mold 2, and an insert 3. The first mold 1 and the second mold 2 are respectively provided with a first cavity 11 and a second cavity 21 that can be assembled. One side of the first mold 1 with the first cavity 11 is a parting surface 14, and a mounting groove 12 for mounting the insert 3 is formed on the parting surface. A first runner 15 is formed inside the first mold 1. A second runner 31 is provided on the insert 3 and communicates with the first runner 15. A gate 32 is formed on the insert 3, connecting the first cavity 11 and the second runner 31. The insert 3 protrudes from the parting surface, and the plane of the parting surface bisects the gate 32. The second mold 2 is also provided with a mating groove 23, which is joined to the portion of the insert 3 protruding from the parting surface. The first mold 1 and the second mold 2 are assembled to form a complete mold. The first mold 1 has a first cavity 11, and the second mold 2 has a second cavity 21. The first cavity 11 and the second cavity 21 are combined to form a closed space to define the external shape of the product. During injection molding, the raw material is injected into this closed space, and after the raw material cools and solidifies, the product is formed. Then, the first mold 1 and the second mold 2 are separated, allowing the closed space to reopen and the product to be removed directly by the operator. The side of the first mold 1 that is combined with the second mold 2 is the parting surface. After the first mold 1 and the second mold 2 are combined, a parting seam is formed at the parting surface, and a parting line is formed on the product at the parting seam. The first mold 1 is provided with an installation groove 12, and an insert 3 is installed in the installation groove 12. The first mold 1 is provided with a first runner 15, and the insert 3 is provided with a second runner 31. The first runner 15 and the second runner 31 are connected. The gate 32 is provided on the insert 3 and connects the second runner 31 with the first cavity 11. The raw material can be injected into the first mold 1 through the first runner 15 and finally injected into the first cavity 11 through the second runner 31 and the gate 32. After the insert 3 is installed on the mounting slot 12, its top protrudes from the mold parting surface. The gate on the insert 3 is exactly bisected by the plane of the mold parting surface. At this time, the gate 32 is located exactly on the mold parting line. The first cavity 11 and the second cavity 21 are symmetrically distributed on both sides of the gate 32, avoiding the difference in raw material flow rate between the first cavity 11 and the second cavity 21 due to the eccentricity of the gate 32. This allows the weld line after the raw material solidifies to be naturally formed at the mold parting seam, coinciding with the product parting line, avoiding exposure and affecting the appearance. At the same time, the uniform filling of the melt reduces stress concentration, improves the structural strength of the product, and avoids flow deviation and dead corners. The part of the insert 3 that is higher than the mold parting surface provides space for the gate 32, ensuring the integrity of the gate 32. On the other hand, this part can be joined with the mating groove 23 located on the second mold 2, thereby fixing the relative position between the first mold 1 and the second mold 2.

[0025] like Figure 2As shown, the second flow channel 31 includes an upper half-groove 311, a lower half-groove 312, and a connecting channel 313. The lower half-groove 312 is located on the upper surface of the insert 3 and is connected to the gate 32. The upper half-groove 311 is located on the lower surface of the second mold 2. The upper half-groove 311 and the lower half-groove 312 are combined to form a closed flow channel. The connecting channel 313 is located on the first mold 1, and its two ends are connected to the lower half-groove 312 and the first flow channel 15, respectively. Dividing the second flow channel 31 into the lower half-groove 312 located on the insert 3 and the upper half-groove 311 located on the second mold 2 facilitates manufacturing, processing, and maintenance and cleaning during use. When the upper half-groove 311 and the lower half-groove 312 are combined, a closed pipe structure is formed for the flow of raw materials. The connecting channel 313 is used to connect the lower half-groove and the first flow channel 15.

[0026] like Figure 2 As shown, a positioning structure is also provided between the first mold 1 and the second mold 2. During the injection molding process, the raw material is generally injected under high pressure. The first mold 1 and the second mold 2 are prone to left and right displacement due to the impact of the high-pressure raw material, which can cause problems such as misalignment of the gate 32, out-of-tolerance product dimensions, and accelerated mold wear. Therefore, a positioning structure is needed between the first mold 1 and the second mold 2 to ensure that the positions of the first mold 1 and the second mold 2 do not shift.

[0027] like Figure 2 As shown, the positioning structure includes a positioning block 13 and a positioning groove 22. The positioning block 13 is disposed on the mold closing surface, and the positioning groove 22 is formed on the side of the second mold 2 facing the first mold 1. The positioning groove 22 is inserted into the positioning block 13. When the positioning groove 22 is inserted into the positioning block 13, when the first mold 1 and the second mold 2 are subjected to external force in the horizontal direction, the positioning block 13 will abut against the groove wall of the positioning groove 22, thereby offsetting the force in the horizontal direction and maintaining the stability of the relative position between the first mold 1 and the second mold 2.

[0028] like Figure 2 As shown, at least two positioning blocks 13 are provided, and the two positioning blocks 13 are respectively provided on opposite sides of the first mold 1. The number and position of the positioning grooves 22 correspond to the positioning blocks 13. The at least two positioning blocks 13 can form at least two fixed points between the first mold 1 and the second mold 2. Compared with a single fixed point, at least two fixed points can not only restrict the relative displacement between the first mold 1 and the second mold 2, but also restrict the relative deflection between the first mold 1 and the second mold 2.

[0029] Example 2

[0030] This embodiment is similar to Embodiment 1 above, except that, as Figure 1As shown, the insert 3 is provided with an installation structure, and the insert 3 is detachably connected to the first mold 1 through the installation structure. The detachable connection of the insert 3 to the first mold 1 through the installation structure facilitates the removal and replacement of the insert 3 by the staff to meet different injection molding requirements. At the same time, by removing the insert 3, the first runner, the second runner 31 and the gate 32 can be better exposed, which facilitates the staff to clean the residue in the first runner, the second runner 31 and the gate 32.

[0031] like Figure 2 As shown, the mounting structure consists of a mounting hole 33 that penetrates the insert 3. A threaded hole 16 is also provided at the bottom of the mounting groove 12. A fastening bolt is inserted into the mounting hole 33, and the fastening bolt is sequentially inserted into the mounting hole 33 and the threaded hole 16, and threadedly connected to the threaded hole 16. Workers can install and remove the insert 3 by tightening or loosening the fastening bolt, making the installation and removal process of the insert 3 simple and quick.

[0032] like Figure 1 As shown, mounting hole 33 is a countersunk hole structure. The countersunk hole structure is used to accommodate the bolt head of the fastening bolt, preventing the bolt head from protruding and affecting the splicing of insert 3 and mating groove 23.

[0033] Example 3

[0034] This embodiment is similar to Embodiment 1 above, except that, as Figure 3 As shown, the portion of insert 3 protruding from the mold-closing surface 14 has a cross-shaped structure, and the shape of the mating groove 23 matches the shape of the portion of insert 3 protruding from the mold-closing surface 14. By setting the portion of insert 3 protruding from the mold-closing surface 14 to a cross-shaped structure, after insert 3 is assembled with mating groove 23, regardless of the direction of external force applied in the horizontal direction, insert 3 and mating groove 23 can have a large contact surface to offset the external force.

[0035] like Figure 1 As shown, the first mold 1 has at least two first cavities 11, which are located on both sides of the mounting groove 12 and connected to it. The number and position of the gates 32 on the insert 3 match the number and position of the first cavities 11, and the number and position of the second cavities 21 match the number and position of the first cavities 11. By setting at least two first cavities 11 and second cavities 21 and gates 32 that match the number of first cavities 11, at least two products can be obtained in a single injection molding, thus improving production efficiency.

[0036] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An injection mold structure, characterized in that, The mold includes a first mold (1) and a second mold (2) and an insert (3). The first mold (1) and the second mold (2) are respectively provided with a first cavity (11) and a second cavity (21) that can be assembled. The side of the first mold (1) with the first cavity (11) is a mold closing surface (14). The mold closing surface (14) is provided with an installation groove (12) for installing the insert (3). The first mold (1) is provided with a first runner (15). The insert (3) is provided with a second runner (31) that is connected to the first runner (15). The insert (3) is provided with a gate (32) that connects the first cavity (11) and the second runner (31). The insert (3) protrudes from the mold closing surface. The plane on which the mold closing surface is located bisects the gate (32). The second mold (2) is also provided with a docking groove (23). The docking groove (23) is assembled with the part of the insert (3) that protrudes from the mold closing surface.

2. The injection mold structure according to claim 1, characterized in that, The second flow channel (31) includes an upper half-groove (311), a lower half-groove (312), and a connecting channel (313). The lower half-groove (312) is disposed on the upper surface of the insert (3) and is connected to the gate (32). The upper half-groove (311) is disposed on the lower surface of the second mold (2). The upper half-groove (311) and the lower half-groove (312) are joined together to form a closed flow channel. The connecting channel (313) is disposed on the first mold (1). The two ends of the connecting channel (313) are connected to the lower half-groove (312) and the first flow channel (15), respectively.

3. The injection mold structure according to claim 1, characterized in that, A positioning structure is also provided between the first mold (1) and the second mold.

4. The injection mold structure according to claim 3, characterized in that, The positioning structure includes a positioning block (13) and a positioning groove (22). The positioning block (13) is disposed on the mold closing surface, and the positioning groove (22) is opened on the side of the second mold (2) facing the first mold (1). The positioning groove (22) is inserted into the positioning block (13).

5. The injection mold structure according to claim 4, characterized in that, At least two positioning blocks (13) are provided, and the two positioning blocks (13) are respectively provided on opposite sides of the first mold (1). The number and position of the positioning grooves (22) correspond to the positioning blocks (13).

6. The injection mold structure according to claim 1, characterized in that, The insert (3) is provided with an installation structure, and the insert (3) is detachably connected to the first mold (1) through the installation structure.

7. The injection mold structure according to claim 6, characterized in that, The mounting structure is a mounting hole (33), which penetrates the insert (3). The bottom of the mounting groove (12) is also provided with a threaded hole (16). A fastening bolt is inserted into the mounting hole (33). The fastening bolt is inserted into the mounting hole (33) and the threaded hole (16) in sequence and is threadedly connected to the threaded hole.

8. The injection mold structure according to claim 7, characterized in that, The mounting hole (33) is a countersunk hole structure.

9. The injection mold structure according to claim 1, characterized in that, The part of the insert (3) protruding from the mold-fitting surface (14) has a cross-shaped structure, and the shape of the mating groove (23) matches the shape of the part of the insert (3) protruding from the mold-fitting surface (14).

10. The injection mold structure according to claim 1, characterized in that, The first mold (1) has at least two first cavities (11), which are located on both sides of the mounting groove (12) and connected to the mounting groove (12). The number and position of the gates (32) on the insert (3) match the number and position of the first cavities (11), and the number and position of the second cavities (21) match the number and position of the first cavities (11).

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