Injection mold

Abstract

The utility model discloses an injection mold, which belongs to the technical field of molds, and comprises a mold frame, a plurality of through holes and a plurality of guide rails, the ejector pins are in one-to-one correspondence with the through holes; the ejector pin is provided with an insertion section with a square cross section; the mold core is mounted on one end surface of the mold frame; the mold core is provided with a plurality of ejector pin holes which are in one-to-one correspondence with the ejector pins and are matched with the insertion sections in shape; the mounting piece is arranged on the mold frame and is positioned on the end surface of one side far away from the mold core; the positioning holes are in one-to-one correspondence with the ejector pins, and the shapes of the positioning holes are matched with those of the insertion sections; the insertion sections sequentially penetrate through the corresponding positioning holes and the penetrating holes and then extend into the ejector pin holes; the newly-added mounting piece is provided with the positioning hole, a worker can determine the inserting position of the ejector pin in advance through the positioning hole, it is ensured that the ejector pin smoothly enters the ejector pin hole, the ejector pin mounting efficiency is greatly improved, the mounting time and the labor cost are saved, and the requirement for large-scale production is met.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to an injection mold. Background Technology

[0002] In existing injection molds, some products have small contact surfaces with the glue or deep ribs, making it impossible to arrange round ejector pins. Flat ejector pins (usually rectangular or square) are required to eject the product. Accordingly, the mold core position needs to be machined into rectangular or square holes (i.e., flat ejector pin holes). In order to ensure that the product does not leak flash, the gap between the flat ejector pin hole and the flat ejector pin needs to be controlled to a very small range.

[0003] Therefore, when fitters assemble ejector pins, because the mold core needs to be assembled into the mold frame first, the operator cannot directly see the position of the ejector pin hole inside the mold core. That is, the operator needs to first insert the ejector pin into the reserved hole on the mold frame, and then rely on personal experience and feel to slowly adjust the position of the flat ejector pin to achieve assembly so that the ejector pin can smoothly enter the ejector pin hole. This kind of installation is extremely inefficient, especially when there are a large number of flat ejector pins, the fitter's assembly difficulty is very high. Utility Model Content

[0004] This utility model provides an injection mold to solve the problems in the prior art.

[0005] The present invention adopts the following technical solution: an injection mold, comprising: a mold frame having a plurality of through holes; ejector pins having a plurality of pins, each corresponding to one of the through holes; each ejector pin having an insertion section with a square cross-section; a mold core mounted on one end face of the mold frame; the mold core having a plurality of ejector pin holes corresponding to one of the ejector pins and whose shape is adapted to the insertion section; and a mounting member disposed on the mold frame and located on the end face away from the mold core; the mounting member having a plurality of positioning holes corresponding to one of the ejector pins and whose shape is adapted to the insertion section; the insertion section passing through the corresponding positioning holes and through holes in sequence and extending into the ejector pin holes.

[0006] Preferably, the mold frame has a slot, and the mounting component is at least partially embedded in the slot and connected to the mold frame.

[0007] Preferably, both the slot and the mounting component are polygonal.

[0008] Preferably, the gap between the sidewall of the pin hole and the insertion section is smaller than the gap between the sidewall of the positioning hole and the insertion section.

[0009] Preferably, the gap between any single side wall of the pin hole and the insertion section is 0-0.015mm, and the gap between any single side wall of the positioning hole and the insertion section is 0-0.025mm.

[0010] Preferably, the gap between any single side wall of the pin hole and the insertion section is 0.01 mm, and the gap between any single side wall of the positioning hole and the insertion section is 0.02 mm.

[0011] Preferably, the ejector pin also has a fixed section with a circular cross-section, and the insertion section is connected to the fixed section and integrally formed.

[0012] Preferably, the injection mold further includes: an ejector pin mounting bracket, slidably connected to the mold frame to drive the ejector pins mounted thereon to move relative to the mold core and the mounting component.

[0013] Preferably, the ejector pin mounting bracket includes: a push plate, slidably connected to the inside of the mold frame; an ejector pin pressure plate, connected to the push plate; having a plurality of mounting holes corresponding one-to-one with the ejector pins, and a limiting wall located in the mounting holes; the ejector pins are slidably inserted into the mounting holes, and abut against the limiting wall and the push plate through the limiting part at the end.

[0014] Preferably, the perforation is a round hole that does not contact the ejector pin, and the depth of the perforation is no more than 15mm.

[0015] The above-mentioned technical solutions adopted in the embodiments of this utility model can achieve the following beneficial effects:

[0016] Firstly, because traditional mold bases typically have round holes, workers installing ejector pins often have to repeatedly adjust their positions to ensure they fit into the ejector pin holes in the mold core due to obstructed visibility. This results in low efficiency during mass production. The newly added mounting component, however, features positioning holes. Workers can use these holes to pre-determine the ejector pin insertion position, ensuring smooth entry into the ejector pin hole. This significantly improves installation efficiency, saves installation time and labor costs, and is suitable for large-scale production needs.

[0017] Secondly, considering that directly machining ejector pin holes that match the shape of the ejector pins on the mold base would be inconvenient and costly due to the large size of the mold base, it is preferable to use mounting parts with positioning holes on relatively smaller parts. This simplifies the process, reduces machining difficulty and cost, and improves the economic efficiency of mold manufacturing. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 This is a front view of the present invention;

[0020] Figure 2This is a perspective view of the present utility model;

[0021] Figure 3 This is a schematic diagram of the ejector pin, mold frame, and mounting components of this utility model;

[0022] Figure 4 This is an exploded view of the mounting components, mold frame, and mold core of this utility model;

[0023] Figure 5 This is an assembly diagram of the ejector pin mounting bracket and ejector pin of this utility model;

[0024] Figure 6 This is a cross-sectional view of the present invention.

[0025] Figure Labels

[0026] 1-Mold base; 11-Through hole; 12-Slot; 2-Ejector pin; 21-Insert section; 22-Fixing section; 23-Limiting part; 3-Mold core; 31-Ejector pin hole; 4-Mounting part; 41-Positioning hole; 5-Push plate; 6-Ejector pin pressure plate; 61-Mounting hole; 62-Limiting wall. Detailed Implementation

[0027] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0028] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0029] Reference Figures 1 to 6 As shown, this utility model embodiment provides an injection mold, which mainly includes a mold frame 1, an ejector pin 2, a mold core 3, and an mounting component 4.

[0030] The mold base 1 has several through holes 11; several ejector pins 2 are arranged, each corresponding to one of the through holes 11; each ejector pin 2 has an insertion section 21 with a square cross-section (i.e., a flat ejector pin, such as...). Figure 3 The mold core 3 is installed on one end face of the mold frame 1; the mold core 3 has several ejector pin holes 31 that correspond one-to-one with the ejector pins 2 and whose shape is adapted to the insertion section 21.

[0031] Mounting component 4 is mounted on mold frame 1 and located on the end face away from mold core 3; it has several positioning holes 41 that correspond one-to-one with ejector pins 2 and whose shape is adapted to the insertion section 21; the insertion section 21 of the ejector pin 2 passes through the corresponding positioning hole 41 and through hole 11 in sequence and extends into the ejector pin hole 31.

[0032] In summary, because the holes 11 on the traditional mold base 1 are mostly round holes, when workers install the ejector pins 2, the mold base 1 obstructs their view, requiring repeated adjustments to the position of the ejector pins 2 to ensure they enter the ejector pin holes 31 of the mold core 3. This results in low efficiency during mass production. The newly added mounting component 4, however, has positioning holes 41. Workers can use these holes to pre-determine the insertion position of the ejector pins 2, ensuring they smoothly enter the ejector pin holes 31. This significantly improves the installation efficiency of the ejector pins 2, saving installation time and labor costs, making it suitable for large-scale production needs.

[0033] Furthermore, considering that directly machining the ejector pin hole 31 (such as a square hole) on the mold base 1 to match the shape of the ejector pin 2 would be inconvenient and costly due to the large size of the mold base 1, the installation of the mounting part 4 and the machining of the positioning hole 41 on the relatively smaller mounting part 4 simplifies the operation compared to directly machining the ejector pin hole 31 on the mold base 1, reduces the machining difficulty and cost, and improves the economic efficiency of mold manufacturing.

[0034] Furthermore, the positional accuracy of the ejector pin 2 can be determined by the positioning hole 41 and the ejector pin hole 31, which can also effectively prevent the ejector pin 2 from being deformed at the through hole 11 due to force during operation (the side wall of the positioning hole 41 and the side wall of the ejector pin hole 31 support the insertion section 21 from two parts, effectively reducing the probability of the ejector pin 2 deforming due to excessive force), ensuring the normal operation of the mold.

[0035] It should be noted that this injection mold is not only suitable for square ejector pins, but also for various irregularly shaped ejector pins, that is, the shapes of the corresponding ejector pin holes and positioning holes can be matched with the ejector pins.

[0036] In some practical applications, refer to Figures 3 to 4 As shown, the mold base 1 has a slot 12, and the mounting member 4 is at least partially embedded in the slot 12 and connected to the mold base 1. The embedded connection of the mounting member 4 can increase the travel of the ejector pin 2. The large travel of the ejector pin 2 allows the ejector pin 2 to more fully eject the product from the mold core 3, especially for some products with complex shapes and high demolding difficulty. The ejector pin 2 has sufficient travel to ensure that the product is completely detached from the mold core 3. In other practical applications, both the slot 12 and the mounting member 4 are polygonal. This polygonal embedded connection not only facilitates the installation of the mounting member 4 in the slot 12, but also ensures that the positioning hole 41 and the ejector pin hole 31 on the mold core 3 correspond exactly after it enters the slot 12. Compared with the circular plate-shaped mounting plate, which requires further position adjustment after being installed in the slot 12, the polygonal design of the mounting member 4 and the slot 12 greatly improves the installation convenience for workers and also helps to ensure the positional accuracy between the positioning hole 41 and the corresponding ejector pin hole 31.

[0037] In some practical applications, refer to Figure 4 and Figure 6 As shown, the gap between the sidewall of the ejector hole 31 and the insertion section 21 is smaller than the gap between the sidewall of the positioning hole 41 and the insertion section 21. Specifically, the gap between any single sidewall of the ejector hole 31 and the insertion section 21 is 0-0.015mm (generally 0.01mm in actual production), and the gap between any single sidewall of the positioning hole 41 and the insertion section 21 is 0-0.025mm (generally 0.02mm in actual production). By controlling the size of the gaps between the ejector pin 2 and the positioning hole 41 and the ejector hole 31, precise guidance and positioning of the ejector pin 2 during insertion are achieved. The relatively large gap of the positioning hole 41 can play a preliminary guiding role, allowing the ejector pin 2 a certain range of motion, facilitating its smooth passage; while the smaller gap of the ejector hole 31 is for the final precise positioning of the ejector pin 2.

[0038] The smaller gap of the ejector hole 31 can strictly limit the positional deviation of the ejector 2 and ensure the positioning accuracy of the ejector 2 during operation. The relatively larger gap of the positioning hole 41 provides a certain margin for the ejector 2, so that it will not be stuck due to a small deviation when passing through the positioning hole 41. At the same time, it also avoids the ejector 2 being unable to enter the ejector hole 31 after passing through the positioning hole 41 due to the tolerance accuracy between the ejector hole 31 and the positioning hole 41.

[0039] In some practical applications, refer to Figures 5 to 6 As shown, based on the ejector pin 2 in any of the above embodiments, the ejector pin 2 also has a fixed section 12 with a circular cross-section, and the insertion section 21 is connected to the fixed section 12 and integrally formed.

[0040] In some practical applications, refer to Figures 5 to 6 As shown, the injection mold also includes an ejector pin mounting bracket, which is slidably connected to the mold base 1 to drive the ejector pins 2 mounted thereon to move relative to the mold core 3 and the mounting component 4.

[0041] Specifically, the ejector pin mounting bracket can be implemented using the following scheme, as shown in the reference. Figures 5 to 6 As shown, it includes a push plate 5 and an ejector pin plate 6.

[0042] The push plate 5 is slidably connected to the inside of the mold base 1; the ejector pin plate 6 is connected to the push plate 5 and has several mounting holes 61 corresponding one-to-one with the ejector pins 2, and a limiting wall 62 located in the mounting holes 61; the ejector pin 2 is slidably inserted into the mounting holes 61, and abuts against the limiting wall 62 and the push plate 5 through the limiting part 13 at its end. In actual production, this ejector pin mounting bracket is generally directly fixed to the drive end of the hydraulic system through a flange, and the movement of the ejector pin 2 relative to the mold base 1 is realized by hydraulic drive.

[0043] In other practical applications, refer to Figure 6 As shown, the perforation 11 is configured as a round hole and does not contact the ejector pin 2 (this perforation 11 is the hole pre-reserved in the mold base 1 during the initial production stage for inserting the ejector pin 2), and the depth of the perforation 11 is no more than 15mm. Since the insertion end of the ejector pin 2 does not contact the perforation 11, by controlling the depth of the perforation 11, it is possible to further prevent the ejector pin 2 from being subjected to force during operation, causing partial local deformation at the perforation 11 (by using the sidewall of the positioning hole 41 and the sidewall of the ejector pin hole 31 to support the insertion section 21 from two parts, the probability of the ejector pin 2 deforming due to excessive force is effectively reduced), that is, to improve the deformation resistance of the ejector pin 2 during operation and ensure the normal operation of the mold.

[0044] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An injection mold, characterized in that, include: The mold frame (1) has several through holes (11); There are several ejector pins (2), each corresponding to a perforation (11); the ejector pin (2) has an insertion section (21) with a square cross-section. The mold core (3) is installed on one end face of the mold frame (1); the mold core (3) has several ejector pin holes (31) that correspond one-to-one with the ejector pins (2) and whose shape is adapted to the insertion section (21). Mounting component (4) is set on mold frame (1) and located on the end face away from mold core (3); it has several positioning holes (41) that correspond one-to-one with ejector pin (2) and whose shape is adapted to the insertion section (21). The insertion segment (21) passes through the corresponding positioning hole (41) and through hole (11) in sequence and then extends into the pin hole (31).

2. The injection mold according to claim 1, characterized in that, The mold frame (1) is provided with a slot (12), and the mounting component (4) is at least partially embedded in the slot (12) and connected to the mold frame (1).

3. The injection mold according to claim 2, characterized in that, Both the slot (12) and the mounting part (4) are set as polygons.

4. The injection mold according to claim 1, characterized in that, The gap between the side wall of the pin hole (31) and the insertion section (21) is smaller than the gap between the side wall of the positioning hole (41) and the insertion section (21).

5. The injection mold according to claim 4, characterized in that, The gap between any single side wall of the pin hole (31) and the insertion section (21) is 0-0.015mm, and the gap between any single side wall of the positioning hole (41) and the insertion section (21) is 0-0.025mm.

6. The injection mold according to claim 5, characterized in that, The gap between any single side wall of the pin hole (31) and the insertion section (21) is 0.01 mm, and the gap between any single side wall of the positioning hole (41) and the insertion section (21) is 0.02 mm.

7. The injection mold according to claim 1, characterized in that, The ejector pin (2) also has a fixed section (22) with a circular cross-section, and the insertion section (21) is connected to the fixed section (22) and integrally formed.

8. The injection mold according to claim 1, characterized in that, The injection mold also includes: The ejector mounting bracket is slidably connected to the mold base (1) to drive the ejector pin (2) mounted thereon to move relative to the mold core (3) and the mounting part (4).

9. An injection mold according to claim 8, characterized in that, The ejector pin mounting bracket includes: The push plate (5) is slidably connected to the inside of the mold frame (1); The ejector plate (6) is connected to the push plate (5); it has several mounting holes (61) corresponding to the ejector (2) and a limiting wall (62) located in the mounting holes (61); The ejector pin (2) slides through the mounting hole (61) and abuts against the limiting wall (62) and the push plate (5) through the limiting part (23) at the end.

10. An injection mold according to claim 1, characterized in that, The perforation (11) is configured as a round hole and does not contact the ejector pin (2), and the depth of the perforation (11) is no more than 15 mm.

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