An exhaust pin for an injection molding mold and a mold having the same

Abstract

The utility model discloses an exhaust pin of injection molding mould and mould containing this exhaust pin, the exhaust pin includes base end body part, the multiple board spare of inlaying connection in base end body part, the front end body part of sleeve joint in the board spare outside and with base end body part fixed connection, the front end of front end body part is hollow, for the gas flow into exhaust pin, the multiple board spare between have exhaust gap. The utility model discloses through with base end body part and board spare inlaying connection, the installation and dismounting of board spare are convenient, and the cleaning of board spare, through setting up exhaust gap between the multiple board spare, the gas is convenient to board export. The utility model discloses simple structure is convenient to install and dismount, is convenient to clean, is not easy to hide dirt and filth, corresponding different injection material, and board spare can design different horizontal groove department and longitudinal groove department depth, and it is convenient for the quick export of gas.

Description

Technical Field

[0001] This utility model relates to the field of molding die technology, specifically to a venting pin for an injection molding die and an injection molding die having the venting pin. Background Technology

[0002] The venting system of an injection mold plays a crucial role in the entire injection molding process. Its main functions include venting air and vaporized plastic, ensuring product quality, improving production efficiency, and facilitating equipment maintenance. During the molding process, venting mechanisms are installed in the components to remove air or gases generated by the molten plastic inside the mold. For example, the columnar shape of the molded part (BOSS orifice) is the encapsulation and flow end of the molten material, and air and vaporized material in the mold are not easily vented from this area. Therefore, when designing the mold, it is necessary to install venting mechanisms such as pins at its front end, hereinafter referred to as "venting pins".

[0003] Existing exhaust pin technologies and their problems:

[0004] (1) Multiple exhaust fins are embedded into the groove and bonded together. Then, through welding and grinding, multiple slits are formed at the front end. After long-term use, the exhaust pin of this structure is prone to blockage due to the solidified components of the molten material, making it difficult to remove the blockage.

[0005] (2) A porous material is used to make the exhaust gap at the front end of the exhaust pin. Since the porous material is difficult to clean after it becomes clogged, the clogged front end of the exhaust pin eventually needs to be scrapped, resulting in a significant loss. Utility Model Content

[0006] This invention provides a venting pin for injection molding molds. The venting pin of this invention has a simple structure, is easy to disassemble and clean, and can be reused. Furthermore, this invention allows for the design of the optimal venting groove depth based on the type of material being injection molded.

[0007] Regarding the exhaust pin structure, the technical solution of this utility model is as follows:

[0008] The venting pin of the injection molding mold includes a base body, multiple plates fitted and connected to the base body, and a front body fitted onto the outside of the plates and fixedly connected to the base body. The front end of the front body is hollowed out to allow gas to flow into the venting pin. Each plate includes a first surface and a second surface. The first surface includes a transverse groove and multiple longitudinal grooves, with a first through hole provided in the transverse groove. The second surface is flat. The base body is fitted and connected to the plates, facilitating the installation, disassembly, and cleaning of the plates. The multiple longitudinal grooves on the plates increase the gas discharge volume. The transverse grooves intersect with the longitudinal grooves, guiding the gas discharged from the longitudinal grooves to the transverse grooves. The width of the transverse grooves is 2-5 times that of the longitudinal grooves. The transverse grooves are located near the front end of the plates for rapid gas discharge from the venting pin. A first through hole is provided in the transverse groove to facilitate gas flow. Multiple plates are arranged side by side, and the multiple first through holes form a first through hole space. The second side of the panel is flat, facilitating the close arrangement of multiple panels. Compared to perforated venting structures, the grooves facilitate ventilation and cleaning, preventing blockages.

[0009] Preferably, in the aforementioned venting pin of the injection molding mold, the depth of the transverse groove is greater than that of the longitudinal groove, which facilitates increasing the venting capacity of the transverse groove, so that the gas discharged from the longitudinal groove gathers in the transverse groove and is discharged smoothly.

[0010] Preferably, in the aforementioned venting pin of the injection molding mold, the plate part includes a hook-shaped profile portion, which includes a first narrow portion and a first wide portion; the base body portion includes a side hook-shaped profile portion, which includes a second narrow portion and a second wide portion; the first narrow portion of the plate part is opposite to the second wide portion of the base body portion, and the first wide portion of the plate part is opposite to the second narrow portion of the base body portion. This interlocking connection method facilitates the quick installation and disassembly of the plate parts, avoiding the cumbersome connection methods such as bolts and the problems of dirt accumulation and difficulty in cleaning.

[0011] Preferably, in the aforementioned venting pin of the injection molding mold, the front end body includes an outer peripheral annular groove and an outer peripheral longitudinal groove arranged in a cross shape. A second through hole is provided in the outer peripheral annular groove, and the second through hole corresponds to the first through hole. The correspondence between the second through hole and the first through hole facilitates the drainage of gas to the outer peripheral annular groove and the outer peripheral longitudinal groove, and further drainage of gas to the external space.

[0012] Preferably, in the aforementioned venting pin of the injection molding die, the base body and the front body are fixed by a retaining pin. The fixing methods for the base body and the front body are diverse, such as snap-fit, bolts, and interlocking connections. This application uses a retaining pin for easy and quick assembly and disassembly. The retaining pin is a metal key.

[0013] Preferably, in the aforementioned venting pins of the injection molding mold, the number of the plates is 2-10, preferably 8.

[0014] Preferably, in the aforementioned venting pin of the injection molding die, the depth of the transverse groove and the longitudinal groove is 0.005-0.03 mm.

[0015] Regarding the mold, the technical solution of this utility model is as follows:

[0016] The injection molding mold includes the aforementioned venting pin.

[0017] Preferably, in the aforementioned injection molding mold, the injection molding material includes polypropylene, polycarbonate, polyamide, and polybutylene terephthalate. When the injection molding material is polypropylene or polycarbonate, the depth of the transverse groove and the longitudinal groove is 0.02-0.03 mm; when the injection molding material is polyamide or polybutylene terephthalate, the depth of the transverse groove and the longitudinal groove is 0.005-0.015 mm.

[0018] In summary, compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial technical effects: (1) The structure is simple, which facilitates the installation and disassembly of the exhaust pin overall structure, especially the installation and disassembly of the plate. (2) It is easy to clean. The front body and the plate are easy to disassemble from the base body. The plate is fitted and connected to the base body. There is no extra structure, which makes it easy to clean. The groove structure of the plate has more holes and gaps, which makes it easier to clean. (3) For different injection molding materials, the plate can be designed with different transverse groove and longitudinal groove depths to facilitate the rapid discharge of gas. Attached Figure Description

[0019] Figure 1 This is a schematic cross-sectional view of a columnar shape example (BOSS part) of a molded part using the present application.

[0020] Figure 2 This is a three-dimensional structural diagram of the exhaust pin of this application.

[0021] Figure 3 This is a three-dimensional structural diagram of the exhaust pin in the exploded state of this application.

[0022] Figure 4 This is a three-dimensional structural diagram of the exhaust pin plate of this application.

[0023] Figure 5 This is a three-dimensional structural diagram of the front body of the exhaust pin of this application.

[0024] Figure 6 This is a three-dimensional structural diagram of the base body of the exhaust pin of this application.

[0025] Figure 7 This is a three-dimensional structural diagram of the assembled state of multiple plates and the base body of this application.

[0026] Figure 8 This is a three-dimensional structural diagram of a single plate and the base body assembly of this application.

[0027] Figure 9 This is a schematic diagram of gas flow in the exhaust pin plate of this application.

[0028] Figure 10 This is a rear view of the front end of the exhaust pin body of this application.

[0029] Figure 11 This is a rear view of the exhaust pin plate of this application.

[0030] The labels in the attached drawings are as follows: 1-plate; 11-longitudinal groove; 12-transverse groove; 13-first through hole; 14-hook-shaped profile; 15-first surface; 16-second surface; 17-first narrow section; 18-first wide section; 2-front end body; 21-outer circumferential groove; 22-outer longitudinal groove; 23-first mounting hole; 24-second through hole; 25-internal fitting hole; 26-third mounting hole; 3-base end body; 31-cylindrical section; 32-front end columnar section; 33-side hook-shaped profile; 34-second narrow section; 35-second wide section; 36-step section; 37-bottom; 38-second mounting hole; 4-fixing pin; 5-venting pin; 6-gas flow direction; 7-exemplary columnar shape (BOSS section). Detailed Implementation

[0031] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings, but this should not be construed as limiting the present utility model. Contents not described in detail in the following embodiments are all common knowledge in the art or can be implemented using conventional technical means in the art.

[0032] Implementation reference of this application Figure 1-11 .

[0033] The venting pin 5 of this application can be designed in any injection molding mold. The venting pin 5 of this application is mainly designed at the end of the columnar shape example (BOSS part) 7. The columnar shape example (BOSS part) 7 is the part where the molten material is encapsulated and the flow end. Air and vaporized material in the mold are not easily discharged from this part. The venting pin is designed in the columnar shape example (BOSS part) 7 to facilitate the discharge of the gas collected here from the mold.

[0034] like Figure 1 As shown, a schematic cross-sectional view of a columnar shape example (BOSS part) of the molded part applied in this application is shown. The exhaust pin 5 is connected to the end of the columnar shape example (BOSS part), and the gas flow direction 6 is as follows. Figure 1 As shown, the flow extends from the end of the columnar shape (BOSS part) to the exhaust pin 5.

[0035] The structure and connection relationship of the exhaust pin 5 in this application are as follows:

[0036] like Figure 2-11 As shown, exhaust pin 5, its front end is Figure 1 The illustrated columnar shape example (BOSS part) is a pin for a molding die. The venting pin 5 includes multiple plates 1, a front end body 2, a base end body 3, and a fixing pin 4. The multiple plates 1 are fitted and connected to the base end body 3, the front end body 2 is sleeved on the base end body 3, and the fixing pin 4 fixes the front end body 2 and the base end body 3. The fixing pin 4 is a metal key. The number of the multiple plates is 5-12; in this embodiment, there are 8.

[0037] like Figure 5 As shown, the front-end body 2 includes an outer annular groove 21, which is disposed on the outer peripheral surface of the front-end body 2 along the circumferential direction; an outer longitudinal groove 22 is disposed along the longitudinal direction of the front-end body 2, and the outer longitudinal groove 22 has the same depth as the outer annular groove 21. A first mounting hole 23 and a third mounting hole 26 are provided within the outer longitudinal groove 22. The first mounting hole 23 and the third mounting hole 26 are symmetrically arranged about the rotation axis of the front-end body 2 of the exhaust pin 5. Figure 6 The second mounting hole 38 of the base body 3 corresponds to the second mounting hole 38 for inserting the fixing pin 4. The first mounting hole 23 is the inlet hole for inserting the fixing pin 4, and the third mounting hole 26 is the outlet hole. A second through hole 24 is provided in the outer peripheral annular groove 21, that is, the second through hole 24 opens in the outer peripheral annular groove 21. The second through hole 24 and Figure 4 The first through hole 13 corresponds to the plate 1. The front body part 2 also includes an internal fitting hole 25, and the first mounting hole 23 passes through the outside of the front body part 2 of the exhaust pin 5 to the internal fitting hole 25.

[0038] like Figure 4 As shown, plate 1 is a metal plate component, which includes a first surface 15 and a second surface 16. The first surface 15 is the front shown in the figure, and the second surface 16 is the back shown in the figure. The second surface 16 is a plane, as shown in the figure. Figure 11As shown. A longitudinal groove 11 and a transverse groove 12 are provided on the first surface 15. The longitudinal groove 11 extends longitudinally along the plate 1 and connects to the transverse groove 12. The transverse groove 12 is located 5mm from the end of the plate 1 and extends along the width direction of the plate 1. The width of the transverse groove 12 is 5mm, and its depth is greater than that of the longitudinal groove 11. The plate 1 also includes a first through hole 13, which is located inside the transverse groove 12 and connects to it. The plate 1 also includes a hook-shaped profile 14, which includes a first narrow portion 17 and a first wide portion 18. When multiple plates 1 are assembled side-by-side, the longitudinal groove 11 forms an exhaust gap, and the longitudinal groove 11 connects to the transverse groove 12, the first through hole 13, and... Figure 5 The second through hole 24 of the front body part 2 forms an exhaust passage. By setting the width and depth of the longitudinal groove 12, different injection molding materials can be adapted to manufacture plates 1 with different exhaust permeability, thereby achieving the optimal exhaust effect under the corresponding injection molding material by selecting the plate 1.

[0039] like Figure 6 As shown, the base body part 3 includes a cylindrical part 31, a front columnar part 32, and a side hook-shaped contour part 33. The side hook-shaped contour part 33 includes a second narrow part 34 and a second wide part 35. A step part 36 is provided at the connection between the front columnar part 32 and the cylindrical part 31. The base body part 3 also includes a bottom 37 and a second mounting hole 38.

[0040] More specifically, the base body portion 3 includes a cylindrical portion 31 extending from the bottom 37 toward the front end, and a front columnar portion 32 extending from the cylindrical portion 31 toward the front end, with a side hook-shaped profile portion 33 formed at the front end of the front columnar portion 32. The side hook-shaped profile portion 33 includes a second narrow portion 34 and a second wide portion 35, and a step portion 36 is provided at the connection between the front columnar portion 32 and the cylindrical portion 31. In addition, a second mounting hole 38 corresponding to the fixing pin 4 is provided on the side of the front columnar portion 32. The distance from the step portion 36 to the second mounting hole 38 is the same as the distance from the base end of the front body portion 2 to the first mounting hole 23. The front columnar portion 32 is a rectangle with a cross-sectional profile consistent with that of the plate 1 in the width direction, and its shape and size match the internal fitting hole 25 of the front body portion 2.

[0041] The assembly method of the exhaust pin 5 in this application is as follows:

[0042] like Figure 2 , 3 As shown in Figures 7 and 8, the hook-shaped contour portion 14 of the plate 1 is fitted with the side hook-shaped contour portion 33 of the base body portion 3. Figure 8This is an assembly diagram of a single plate 1 and the base body 3. The first narrow portion 17 of plate 1 is opposite to the second wide portion 35 of the base body 3, and the first wide portion 18 of plate 1 is opposite to the second narrow portion 34 of the base body 3. Multiple plates 1 are arranged side by side and are fitted and snapped into the base body 3. The front end body 2 is fitted into the base body 3. The base end of the pin front end body 2 is attached to the stepped portion 36 of the base body 3. The first mounting hole 23, the second mounting hole 38, and the third mounting hole overlap, as do the first through hole 13 and the second through hole 24. The fixing pin 4 is inserted sequentially into the first mounting hole 23, the second mounting hole 38, and the third mounting hole from the direction of the first mounting hole 23, thus completing the assembly of the discharge pin 5 in this embodiment.

[0043] When disassembling the discharge pin 5 in this embodiment, the assembly steps described above can be performed in reverse order, which will not be repeated here.

[0044] Description of the gas discharge path of exhaust pin 5 in this application:

[0045] Structurally, such as Figure 1-11 As shown, multiple plates 1 form a first through-hole forming space in the thickness direction, consisting of a first through-hole 13. A longitudinal exhaust gap is formed between each plate 1 by a longitudinal groove 11, and a transverse exhaust gap is formed by a transverse groove 12. Thus, the longitudinal groove 11, the transverse groove 12, and the first through-hole 13 form a first exhaust flow path. The first through-hole 13 corresponds to the second through-hole 24. The front end body 2 is provided with a cross-shaped outer annular groove 21 and an outer longitudinal groove 22. The second through-hole 24 is disposed within the outer annular groove 21. Therefore, the space formed by the second through-hole 24, the outer annular groove 21, and the outer longitudinal groove 22 constitutes a second exhaust flow path. Gas flowing in from the front end of the front end body 2 is discharged through the first and second flow paths and then discharged through the exhaust pin.

[0046] Exhaust process: First, gas enters the exhaust pin 5 from the end of the columnar shape (BOSS part) 7 through the internal fitting hole 25. The gas entering the exhaust pin 5 first enters the longitudinal groove 11, then the transverse groove 12, and then the space formed by the first through hole 13. It then enters the second through hole 24 through the first through hole 13, and enters the space between the outer peripheral annular groove 21 and the outer peripheral longitudinal groove 22 from the side of the exhaust pin 5, and is finally discharged to the outside.

[0047] This application's venting pins can be designed with an optimal venting groove structure based on the type of material being injection molded. For high-viscosity materials such as PP (polypropylene) and PC (polycarbonate), the required venting groove gap can be set to 0.02–0.03 mm, i.e., the depth of the longitudinal groove 11 and the transverse groove 12 is set to 0.02–0.03 mm. For low-viscosity materials such as PBT (polybutylene terephthalate) and PA (polyamide), the venting groove depth can be set to 0.005–0.015 mm, i.e., the depth of the longitudinal groove 11 and the transverse groove 12 is set to 0.02–0.03 mm. In implementation, the final size and gap of the sheet metal can be determined based on the shape and quality requirements of the molded part, the molding process parameters, and the results of trial molding.

[0048] The discharge pin 5 in the embodiments of this application has been described above, but this application is not limited to the configuration of the above embodiments. For example, the discharge pin 5 in the above embodiments is described as a pin of a mold component with a columnar shape (BOSS part), but it is not limited to this and can also be applied to other pin examples, etc.

[0049] Furthermore, the dimensions and proportions of each part of the discharge pin 5 are not limited to the above embodiments. In the above embodiment, eight plates 1 were used in the discharge pin 5, but this is not a limitation. Alternatively, multiple plates 1 with completely different shapes can also be used.

[0050] The foregoing general description of the utility model and its specific embodiments should not be construed as limiting the technical solution of the utility model. Those skilled in the art, based on the disclosure of this application, can add, reduce, or combine the disclosed technical features in the foregoing general description and / or specific embodiments (including examples) without departing from the constituent elements of the utility model, to form other technical solutions within the protection scope of this utility model.

Claims

1. A venting pin for an injection molding die, characterized in that: The exhaust pin (5) includes a base body part (3), multiple plates (1) fitted and connected to the base body part (3), and a front end body part (2) sleeved on the outside of the plates (1) and fixedly connected to the base body part (3). The front end of the front end body part (2) is hollowed out for gas to flow into the exhaust pin (5). The plates (1) include a first surface (15) and a second surface (16). The first surface (15) includes a transverse groove (12) and multiple longitudinal grooves (11). A first through hole (13) is provided in the transverse groove (12). The second surface (16) is a plane.

2. The venting pin of the injection molding die according to claim 1, characterized in that: The depth of the transverse groove (12) is greater than that of the longitudinal groove (11).

3. The venting pin of the injection molding die according to claim 1, characterized in that: The plate (1) includes a hook-shaped profile portion (14), which includes a first narrow portion (17) and a first wide portion (18). The base body portion (3) includes a side hook-shaped profile portion (33), which includes a second narrow portion (34) and a second wide portion (35). The first narrow portion (17) of the plate (1) is opposite to the second wide portion (35) of the base body portion (3), and the first wide portion (18) of the plate (1) is opposite to the second narrow portion (34) of the base body portion (3).

4. The venting pin of the injection molding die according to claim 1, characterized in that: The front end body part (2) includes an outer peripheral annular groove part (21) and an outer peripheral longitudinal groove part (22) arranged in a cross shape. A second through hole (24) is provided in the outer peripheral annular groove part (21), and the second through hole (24) corresponds to the first through hole (13).

5. The venting pin of the injection molding die according to claim 1, characterized in that: The base body part (3) and the front body part (2) are fixed by a fixing pin (4).

6. The venting pin of the injection molding mold according to claim 1, characterized in that: The number of the plate (1) is 2-10.

7. The venting pin of the injection molding die according to claim 1, characterized in that: The depth of the transverse groove (12) and the longitudinal groove (11) is 0.005-0.03 mm.

8. An injection molding die, characterized in that: Includes the exhaust pin (5) as described in any one of claims 1-7.

9. The injection molding die according to claim 8, characterized in that: The injection molding material of the mold includes polypropylene, polycarbonate, polyamide, and polybutylene terephthalate. When the injection molding material is polypropylene or polycarbonate, the depth of the transverse groove (12) and the longitudinal groove (11) is 0.02-0.03 mm; when the injection molding material is polyamide or polybutylene terephthalate, the depth of the transverse groove (12) and the longitudinal groove (11) is 0.005-0.015 mm.

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