A mold for integral injection molding of bushings with end face support structure

Abstract

This utility model discloses a mold with an end-face support structure for integral injection molding of bushings, including a fixed mold and a moving mold. A fixed mold insert is disposed within the fixed mold, and a moving mold insert is disposed within the moving mold. An elastic support structure is provided between the fixed mold and the fixed mold insert. The elastic support structure includes an elastic element and a support column. The lower end face of the support column contacts and covers the upper end face of the corresponding support column of the bushing. During mold closing, the elastic element drives the support column to move towards the moving mold insert, so that the end of the support column near the moving mold insert abuts against and covers the bushing. This utility model has the following advantages and effects: This solution utilizes a new mechanical structure, ensuring a tight fit between the support column and the bushing, reducing the risk of the bushing being damaged or the end face of the bushing being plasticized during injection molding and mold closing. Furthermore, the support column is easy to replace if damaged, and the pressure between the support column and the end face of the bushing can be quickly adjusted by replacing the spring, reducing maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a mold with an end face support structure for integral injection molding of bushings. Background Technology

[0002] Injection molds are tools used to process and mold plastic products, and are widely used in the automotive, home appliance, and electronics industries. Their core structure includes a moving mold, a fixed mold, and systems for gating, temperature control, and ejection. Molding processes are classified into six categories: injection molding, compression molding, extrusion, blow molding, vacuum forming, and high-density polystyrene molding.

[0003] A Chinese patent with publication number CN212422021U discloses an injection mold with a bushing fixing bracket, which includes a fixed mold plate, a lower mold plate, a fixed mold core and a lower mold core disposed in the receiving cavities of the fixed mold plate and the lower mold plate, respectively. The fixed mold core is fixedly connected to the fixed mold plate, and the lower mold core is fixedly connected to the lower mold plate. A cavity for forming the fixing bracket is opened on the side of the lower mold core near the fixed mold core. Three support columns are vertically arranged on the lower mold core, and the three support columns pass through the lower mold core and are threadedly connected to the lower mold core. A first bushing is inserted into the support columns. Two locking columns are vertically arranged in the cavity, and the two locking columns pass through the lower mold core and are threadedly connected to the lower mold core. A third bushing is inserted into the locking columns. Two relief grooves are opened on the lower mold core, and forming blocks are inserted into both relief grooves. Each of the two forming blocks is provided with a mounting column, and a second bushing is inserted into the mounting column.

[0004] However, the above-mentioned injection mold with bushing fixing bracket has the following disadvantages: when the injection mold is closed, the support column on the end face of the bushing is easy to damage the bushing, or there is a gap between the support column and the bushing, resulting in the bushing end being coated with plastic. Utility Model Content

[0005] The purpose of this invention is to provide a mold with an end-face support structure for integral injection molding of bushings, which has the effect that the bushing is not easily damaged when the mold is closed, and the end face of the bushing is not easily covered by plastic after injection molding.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a mold for integral injection molding of bushing with an end face support structure, comprising a fixed mold and a moving mold, wherein a fixed mold insert is provided in the fixed mold, and a moving mold insert is provided in the moving mold, wherein the fixed mold insert and the moving mold insert form a cavity after being closed, and an elastic support structure is provided between the fixed mold and the fixed mold insert, wherein the elastic support structure comprises an elastic element and a support column, wherein the lower end face of the support column contacts and covers the upper end face of the corresponding support column of the bushing; when the mold is closed, the elastic element drives the support column to move towards the moving mold insert, so that the end of the support column near the moving mold insert abuts against and covers the bushing.

[0007] By adopting the above technical solution, a bushing is installed in the cavity before mold closing. When the mold closes, the moving mold insert pushes the support column. At this time, the elastic element is compressed, and the support column is subjected to the reaction force of the elastic element. The support column abuts against the end of the bushing through the elastic element, so that the support column and the bushing fit tightly together. This avoids the gap between the support surface and the bushing, which would cause the bushing end to be coated with plastic during injection. At the same time, it avoids the bushing being damaged due to excessive mold closing, thereby improving the product yield.

[0008] A further feature of this invention is that a first mounting groove is formed through the mold insert, and the support column is positioned and installed within the first mounting groove.

[0009] By adopting the above technical solution, the support column is positioned and installed through the first mounting groove opened in the fixed mold insert, which improves the installation efficiency of the support column. At the same time, the support column can be removed along the first mounting groove, which facilitates the replacement of the support column after damage and reduces maintenance costs.

[0010] A further feature of this invention is that the support column is provided with a limiting protrusion ring, and the first mounting groove is provided with a corresponding limiting part. When the mold is opened, the support column is limited and engaged by the limiting protrusion ring and the limiting part.

[0011] By adopting the above technical solution, when the mold is opened, the support column tends to move downward under the action of the elastic force of the elastic element and gravity. At this time, the limiting part at the top of the first mounting groove and the limiting protrusion on the support column cooperate to prevent the support column from extending too far out of the fixed mold insert, reduce the displacement distance of the support column during the mold closing process, reduce the wear between the support column and the first mounting groove, and increase the durability of the equipment.

[0012] A further feature of this invention is that the elastic element is a spring, one end of the spring is located inside the fixed mold, and the other end of the spring abuts against the end of the support column. The spring has a tendency to drive the support column to move toward the moving mold insert.

[0013] By adopting the above technical solution, the spring is compressed when the mold is closed, so that the end of the support column fits tightly with the bushing, preventing the product from being overmolded or the bushing from being crushed after injection molding, thus improving the quality of the product after injection molding.

[0014] A further feature of this invention is that a receiving groove is provided in the fixed mold for positioning and installing the spring, the receiving groove is coaxially arranged with the corresponding first mounting groove, and the diameter of the receiving groove is smaller than the outer diameter of the support column.

[0015] By adopting the above technical solution, the spring is installed in the receiving cavity, which facilitates spring positioning, improves installation accuracy, and enhances installation convenience. The diameter of the receiving groove is smaller than that of the support column, which prevents the support column from being pushed into the receiving cavity by the moving mold insert during the mold closing process, thereby over-compressing the spring and improving the spring's durability.

[0016] A further feature of this invention is that a second mounting groove is provided inside the moving mold insert, and a positioning post for positioning the mounting bushing is fixed inside the second mounting groove.

[0017] By adopting the above technical solution, the positioning post is installed in the second mounting groove. When the mold is opened, the user puts the bushing on the positioning post, which facilitates the positioning and installation of the bushing, improves the convenience of operation, and fixes the bushing, restricts the horizontal displacement of the bushing, thereby improving the injection molding accuracy.

[0018] A further feature of this invention is that a positioning recess is provided on the side of the support column near the positioning column, and a positioning protrusion is provided at the end of the positioning column. The positioning protrusion passes through the cavity and is positioned and engaged with the positioning recess.

[0019] By adopting the above technical solution, when the mold is closed, the moving mold insert moves to the side of the fixed mold insert, so that the positioning protrusion at the end of the positioning column passes through the bushing in the cavity and is inserted into the positioning recess of the support column, thereby improving the mold closing accuracy and making it easier for the end of the support column to fit the bushing end of the product to be injected.

[0020] A further feature of this invention is that the positioning protrusion is provided with a guide surface, and when the mold is closed, the support column is guided and engaged with the positioning column through the guide surface.

[0021] By adopting the above technical solution, when the positioning post is inserted into the support post, the positioning post is guided into the positioning recess along the guide surface. By setting the guide surface, the wear of the positioning post and the support post during the insertion process is reduced, making it easier for the positioning post to be inserted into the support post, thereby improving the mold closing efficiency.

[0022] A further feature of this invention is that a fixing structure is provided between the fixed mold and the fixed mold insert, and the fixed mold insert is fixedly connected to the fixed mold through the fixing structure.

[0023] By adopting the above technical solution, the fixed mold insert is fixed inside the fixed mold and is not easy to detach. This prevents the support column from being pushed away from the fixed mold by the elastic element when it pushes the support column outside the fixed mold insert, thus improving the stability of the mold installation.

[0024] A further feature of this invention is that the fixing structure includes a bolt, a first positioning hole, and a second positioning hole. The first positioning hole is disposed through the fixed mold, and the bolt passes through the first positioning hole and engages with the second positioning hole for positioning.

[0025] By adopting the above technical solution, the fixed mold insert is locked to the fixed mold with bolts, and the bolts are easy to install and remove. If the support column or elastic element is damaged, the fixed mold and the fixed mold insert can be separated by removing the bolts so that the support column or elastic element can be replaced.

[0026] In summary, this utility model has the following beneficial effects:

[0027] 1. The elastic support structure located within the fixed mold insert avoids gaps between the support surface and the bushing, which could cause the bushing end to be coated with plastic during injection molding. It also avoids excessive interference during mold closing, which could damage the bushing and improve product yield.

[0028] 2. The positioning pins located on the moving mold inserts provide precise bushing positioning and convenient installation.

[0029] 3. The use of guide surfaces at the ends of the positioning pins reduces wear during the insertion of the positioning pins and support pins, facilitates the insertion of the positioning pins into the support pins, and thus improves mold closing efficiency. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0031] Figure 2 This is a top view of the present invention.

[0032] Figure 3 yes Figure 2 A cross-sectional view of section AA in the middle.

[0033] Figure 4 yes Figure 3 A magnified view of a portion of point C.

[0034] Figure 5 yes Figure 2 A sectional view of section BB in the middle.

[0035] Figure 6 This is a structural diagram of an injection molded part.

[0036] In the diagram: 1. Fixed mold insert; 11. First mounting groove; 111. Limiting part; 2. Moving mold insert; 21. Second mounting groove; 22. Positioning post; 221. Positioning protrusion; 222. Guide surface; 3. Fixed mold; 31. Receiving groove; 4. Moving mold; 5. Elastic support structure; 51. Spring; 52. Support post; 521. Limiting protrusion; 522. Positioning recess; 6. Fixing structure; 61. Bolt; 62. First positioning hole; 63. Second positioning hole; 7. Cavity; 8. Injection molded part; 9. Bushing. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings.

[0038] A mold for integral injection molding of bushings with an end-face support structure, such as Figure 1-3As shown, the mold includes a fixed mold 3 and a moving mold 4. A fixed mold insert 1 is provided inside the fixed mold 3, and a moving mold insert 2 is provided inside the moving mold 4. After the fixed mold insert 1 and the moving mold insert 2 are closed, a cavity 7 is formed to accommodate the injection molded part 8. A bushing 9 is pre-inserted into the cavity 7. After the injection molded part 8 is formed, the bushing 9 is embedded within it. An elastic support structure 5 is provided between the fixed mold 3 and the fixed mold insert 1. The elastic support structure 5 includes an elastic element and a support column 52. The elastic element is installed inside the fixed mold 3, and the support column 52 is installed in the fixed mold insert. 1. During mold closing, the moving mold insert 2 pushes the support column 52. At this time, the elastic element is compressed, and the elastic element drives the support column 52 to move towards the moving mold insert 2. The support column 52 is subjected to the reaction force of the elastic element, and the support column 52 abuts against the end of the bushing 9 through the elastic element and covers the end face of the bushing 9, so that the support column 52 and the bushing 9 are tightly fitted, preventing the gap between the support column 52 and the bushing 9 from causing the end of the bushing 9 to be coated with plastic during injection, while avoiding excessive mold closing which could damage the bushing 9 and improve the product yield.

[0039] like Figure 3 , 4 As shown, in this embodiment, the fixed mold insert 1 has a first mounting groove 11 through it, and the support column 52 is positioned and installed in the first mounting groove 11, which improves the installation efficiency of the support column 52. At the same time, the support column 52 can be removed from the first mounting groove 11, which facilitates the replacement of the support column 52 after damage and reduces maintenance costs. The support column 52 can slide up and down along the first mounting groove 11. The first mounting groove 11 is provided with a limiting part 111 to limit the vertical displacement of the support column 52. The support column 52 is correspondingly provided with a limiting protrusion 521. The upper end of the support column 52 is connected to the spring 51. When the mold is opened, the support column 52 tends to move downward under the action of the spring 51. The limiting ring 521 and the limiting part 111 limit the movement, preventing the support column 52 from extending too far out of the fixed mold insert 1. This reduces the displacement distance of the support column 52 during the mold closing process, reduces the wear between the support column 52 and the first mounting groove 11, and increases the durability of the equipment. When the mold is closed, the spring 51 is compressed, so that the end of the support column 52 fits tightly with the bushing 9, preventing the product from being coated or the bushing 9 from being crushed after injection molding, and improving the quality of the product after injection molding.

[0040] like Figure 3 , 4As shown in Figure 6, in this embodiment, a second mounting groove 21 for mounting the positioning post 22 is provided in the moving mold insert 2. The positioning post 22 passes through the moving mold insert 2, and a positioning protrusion 221 is provided at the end of the positioning post 22. Before mold closing, the bushing 9 can be fitted onto the positioning post 22 to facilitate the positioning and installation of the bushing 9. At the same time, the positioning protrusion 221 passes through the bushing 9 to limit the horizontal displacement of the bushing 9, thereby improving the injection molding accuracy and product quality. In addition, a positioning recess 522 with a shape and size that matches the positioning protrusion 221 is provided at the bottom of the support post 52. The positioning protrusion 221 is provided with a guide surface 222 corresponding to the positioning recess 522. When the mold is closed, the positioning protrusion 221 is guided into the positioning recess 522 through the guide surface 222, making it easier for the moving mold insert 2 and the fixed mold insert 1 to align, improving the positioning accuracy, and reducing the wear of the positioning post 22 and the support post 52 during the mold closing process, thereby improving the durability of the equipment.

[0041] like Figure 4 , 5 As shown, in this embodiment, the fixed mold 3 has a receiving cavity for positioning and installing the spring 51 at the first mounting groove 11, which facilitates the installation and replacement of the spring 51. By replacing the spring 51, the pressure between the support column 52 and the end face of the bushing 9 can be quickly adjusted, reducing maintenance costs. The fixed mold 3 is also provided with a fixing structure 6. The fixed mold insert 1 is fixed inside the fixed mold 3 by the fixing structure 6, which is not easy to detach. This prevents the support column 52 from being pushed away from the fixed mold insert 1 by the elastic element, thus improving the stability of the mold installation. The fixing structure 6 includes a bolt 61, a first positioning hole 62 and a second positioning hole 63. The first positioning hole 62 is provided through the fixed mold 3. The bolt 61 passes through the first positioning hole 62 and is locked in the second positioning hole 63. The fixed mold insert 1 is locked to the fixed mold 3 by the bolt 61. The bolt 61 is easy to install and remove. After the support column 52 or the elastic element is damaged, the fixed mold 3 and the fixed mold insert 1 can be separated by removing the bolt 61 so as to replace the support column 52 or the elastic element.

[0042] like Figure 1 , 6 As shown, in this embodiment, a bushing 9 is pre-embedded in the cavity during mold opening and fitted onto the positioning post 22, so that the lower end face of the bushing 9 is supported on the moving mold insert 2 and the upper end face of the bushing 9 abuts against the end of the support post 52. After the mold is closed, injection molding is performed so that the product is formed in one step. It is not necessary to install the bushing 9 separately after injection molding, thus improving product production efficiency.

[0043] The basic working principle of this utility model is as follows: When the mold is opened, the bushing 9 is pre-embedded in the cavity 7 and correspondingly fitted onto the positioning post 22. The support post 52 protrudes outward from the fixed mold insert 1 under the action of gravity and elastic element. During the mold closing process, the moving mold insert 2 moves upward, so that the upper end face of the bushing 9 abuts against the lower end of the support post 52, and the upper end face of the bushing 9 is completely covered by the support post. Under the push of the moving mold insert 2, the support post 52 moves upward and compresses the elastic element. At this time, the support post 52 presses against the end face of the bushing 9 under the action of the elastic force of the elastic element. In this way, the risk of plastic coating on the end face of the bushing 9 is reduced during injection molding, and the risk of the bushing 9 being crushed during injection molding and mold closing is also reduced.

[0044] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A mold for integral injection molding of bushings with an end-face support structure, comprising a fixed mold (3) and a movable mold (4), wherein a fixed mold insert (1) is disposed in the fixed mold (3), and a movable mold insert (2) is disposed in the movable mold (4), wherein the fixed mold insert (1) and the movable mold insert (2) form a cavity (7) after the mold is closed, characterized in that: An elastic support structure (5) is provided between the fixed mold (3) and the fixed mold insert (1). The elastic support structure (5) includes an elastic element and a support column (52). The lower end face of the support column (52) contacts and covers the upper end face of the corresponding support column (52) of the bushing (9). When the mold is closed, the elastic element drives the support column (52) to move towards the moving mold insert (2) so that the end of the support column (52) close to the moving mold insert (2) abuts against and covers the bushing (9).

2. A mold with an end-face support structure for integral injection molding of bushings according to claim 1, characterized in that: The fixed mold insert (1) has a first mounting groove (11) through it, and the support column (52) is positioned and installed in the first mounting groove (11).

3. A mold with an end-face support structure for integral injection molding of bushings according to claim 2, characterized in that: The support column (52) is provided with a limiting protrusion (521), and the first mounting groove (11) is provided with a corresponding limiting part (111). When the mold is opened, the support column (52) is limited and engaged with the limiting part (111) through the limiting protrusion (521).

4. A mold with an end-face support structure for integral injection molding of bushings according to claim 2, characterized in that: The elastic element is a spring (51), one end of which is located in the fixed mold (3), and the other end of which abuts against the end of the support column (52). The spring (51) has a tendency to drive the support column (52) to move toward the moving mold insert (2).

5. A mold with an end-face support structure for integral injection molding of bushings according to claim 4, characterized in that: The fixed mold (3) has a receiving groove (31) for positioning and installing the spring (51). The receiving groove (31) is coaxially arranged with the corresponding first mounting groove (11), and the diameter of the receiving groove (31) is smaller than the outer diameter of the support column (52).

6. A mold with an end-face support structure for integral injection molding of bushings according to claim 1, characterized in that: The moving mold insert (2) has a second mounting groove (21) inside, and a positioning post (22) for positioning the mounting bushing (9) is fixed inside the second mounting groove (21).

7. A mold with an end-face support structure for integral injection molding of bushings according to claim 6, characterized in that: The support column (52) has a positioning recess (522) on the side near the positioning column (22), and the end of the positioning column (22) has a corresponding positioning protrusion (221). The positioning protrusion (221) passes through the cavity (7) and is positioned and engaged with the positioning recess (522).

8. A mold with an end-face support structure for integral injection molding of bushings according to claim 7, characterized in that: The positioning protrusion (221) is provided with a guide surface (222). When the mold is closed, the support column (52) is guided and engaged with the positioning column (22) through the guide surface (222).

9. A mold with an end-face support structure for integral injection molding of bushings according to claim 1, characterized in that: A fixing structure (6) is provided between the fixed mold (3) and the fixed mold insert (1), and the fixed mold insert (1) is fixedly connected to the fixed mold (3) through the fixing structure (6).

10. A mold with an end-face support structure for integral injection molding of bushings according to claim 9, characterized in that: The fixing structure (6) includes a bolt (61), a first positioning hole (62) and a second positioning hole (63). The first positioning hole (62) is disposed through the fixed mold (3), and the bolt (61) passes through the first positioning hole (62) and is positioned and engaged with the second positioning hole (63).

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