Positioning mechanism for preventing PIN from being damaged by dragging of mold
By embedding bronze auxiliary inserts into the mold, the problem of pin dragging was solved, enabling precise positioning and fixing of the pins, improving the yield and production efficiency of injection molded products, and reducing costs.
Patent Information
- Application Number
- CN202520452341.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-03-14
AI Technical Summary
During injection molding, friction between the PIN pin attachment and the front mold insert causes drag marks, affecting the product's appearance quality and reducing the yield rate. Traditional optimization design and high-precision machining are costly and have limited effectiveness.
A bronze auxiliary insert is inlaid in the front mold insert to reduce friction by utilizing its low hardness, and the structural design of the auxiliary insert enables precise positioning and fixation of the PIN pin.
Reduce the risk of pin dragging, improve yield, optimize structural design, reduce processing costs, ensure accurate pin positioning and fixation, and improve production efficiency and product quality.
Smart Images
Figure CN223802965U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of mould injection, especially to a positioning mechanism for preventing PIN pin from being dragged and damaged in mould. BACKGROUND
[0002] In the injection molding process, especially in the manufacturing process of products such as charger housings, it is necessary to synchronously inject PIN pin accessories (such as electrical plugs) into one end of the product housing. In order to achieve this process, a front mold insert is usually used to fix and position the PIN pin accessories, so that they can be accurately embedded into the injection molding cavity and finally molded on the product.
[0003] However, in the actual production process, due to factors such as the precision of the injection molding machine, the precision of the mold processing, the change of the mold temperature, and the pressure during injection and curing, a close-fitting state will be formed between the PIN pin accessories and the front mold insert. When the mold is opened, the contact surface between the front mold insert and the PIN pin will produce friction, which can easily cause the PIN pin to be dragged and scratched, affecting the appearance quality of the product and possibly reducing the yield of production.
[0004] In order to solve this problem, the traditional method is usually to optimize the design of the front mold insert or use a higher precision processing technology, but these methods are often costly and have limited effect. Therefore, an improved scheme is needed that can effectively reduce the dragging and scratching of PIN pins and improve the yield of products. INVENTION CONTENTS
[0005] The utility model aims to provide a technical scheme that can solve the above problems.
[0006] The utility model provides a positioning mechanism for preventing PIN pin from being dragged and damaged in mould, which comprises a mold core assembly and a mold core assembly that form an injection molding cavity by surrounding each other, the mold core assembly is provided with a front mold core and a rear mold core, the mold core assembly is provided with a side mold core and a rear mold core, two groups of side mold cores form the side of the injection molding cavity by surrounding each other, the front mold core is provided with a front mold insert, the front mold insert forms the top surface of the injection molding cavity, one end of the rear mold core passes through the rear mold core and is inserted into the injection molding cavity, cooperates with the side mold core and the front mold insert, and forms the internal cavity of the injection molded product; the front mold insert is provided with an accessory groove for placing and fixing the PIN pin accessory, so that one end of the PIN pin accessory is inserted into the injection molding cavity and is injection molded on one end of the injection molded product; an auxiliary insert is arranged in the accessory groove, the auxiliary insert is fixedly connected to the front mold insert, and an auxiliary through hole is arranged in the auxiliary insert for placing and fixing the PIN pin accessory.
[0007] Further, the material hardness of the auxiliary insert is lower than that of the PIN pin accessory.
[0008] Further, the auxiliary insert is made of bronze.
[0009] Further: the auxiliary insert is provided with a first insert and a second insert, and the middle parts of the first insert and the second insert along the long edge direction are respectively provided with sliding grooves, the width of the sliding grooves matches the PIN pin accessory, so that the PIN pin accessory can be inserted into the sliding groove.
[0010] Further: the side of the first insert and the second insert provided with the sliding groove is abutted and matched with each other, so that the sliding grooves of the two are matched to form an auxiliary through hole.
[0011] Further: the auxiliary insert is further provided with a third insert, one end of the third insert is inserted into the auxiliary through hole, and the third insert forms a limiting position for the PIN pin accessory.
[0012] Further: the third insert is embedded in the auxiliary through hole, and the two sides of the third insert are respectively abutted to the bottom surfaces of the sliding grooves of the first insert and the second insert, so that the first insert and the second insert are respectively abutted to the accessory groove of the front mold insert and form an interference fit.
[0013] Further: the third insert is provided in an inverted L shape, one end of the third insert inserted into the auxiliary through hole is provided as a positioning part, the other end of the third insert forms a bent part bent by a certain angle, and the first insert and the second insert are provided with notch steps corresponding to the positions of the bent part.
[0014] Compared with the prior art, the beneficial effects of the utility model are:
[0015] 1. Reduce the risk of PIN pin damage and improve the yield: by embedding the auxiliary insert of bronze material at the position of the front mold insert where the hardware PIN pin is placed, since the hardness of bronze is lower than that of metal iron or steel (the common material of PIN pin), the friction between the contact surface of the hardware PIN pin and the auxiliary insert of bronze material will not cause the PIN pin to be damaged, effectively improving the yield of product production.
[0016] 2. Optimize the structure design and reduce the friction contact: after increasing the bronze material positioning auxiliary insert, the accessory groove hole position of the front mold insert can be treated as empty, and the hardware PIN pin only contacts the auxiliary insert of bronze material when the mold is opened, compared with directly contacting the front mold insert, the risk of PIN pin damage is greatly reduced.
[0017] 3. Easy to process and cost control: bronze material is easy to cut, forge and process, and can be remelted and forged after long-term use and wear, reducing the use cost in the whole production process.
[0018] 4. Precise positioning of the PIN needle accessory: the auxiliary insert is provided as a first insert and a second insert, and the two inserts are respectively provided with a sliding groove matching the width of the PIN needle accessory at the middle part along the long side direction, the PIN needle accessory can be inserted into the sliding groove, which realizes the positioning of the PIN needle accessory and ensures that the PIN needle accessory can be normally separated during mold opening. The first insert and the second insert are abutted and fitted, and the sliding grooves cooperate to form an auxiliary through hole, which further precisely positions the PIN needle accessory.
[0019] 5. Stable installation of the auxiliary insert: the third insert added to the auxiliary insert has a thickness slightly thicker than the auxiliary through hole, and after being embedded in the auxiliary through hole, the first insert and the second insert are slightly expanded to the two sides, and an interference fit is formed with the accessory groove of the front mold insert, thereby stabilizing the installation of the auxiliary insert. The third insert is provided in an inverted L shape, the positioning part is inserted into the auxiliary through hole to limit the PIN needle accessory, and the bent part abuts the notch step of the first insert and the second insert, which determines the position of the third insert and accurately determines the depth of the PIN needle accessory inserted into the product shell, thereby ensuring that the production requirements are met.
[0020] Therefore, through the above improvements, the positioning mechanism for preventing the PIN needle from being damaged by the mold can be provided, the auxiliary insert made of bronze is added to the front mold insert, the low hardness of bronze is used to reduce the friction between the PIN needle and the insert, thereby avoiding the PIN needle surface from being damaged. At the same time, the design of the auxiliary insert also optimizes the positioning and fixing mode of the PIN needle, and further improves the production efficiency and product quality.
[0021] Additional aspects and advantages of the present application will be described in part in the following description, and some will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.
[0023] Figure 1 is a structure schematic view of the front mold insert, the auxiliary insert and the PIN needle accessory in a separated state;
[0024] Figure 2 is a structure schematic view of the third insert and the sliding groove of the present application;
[0025] Figure 3 is a structure schematic view of the auxiliary insert and the front mold insert in an assembled state;
[0026] Figure 4 is the sectional view of the front die and the front die insert of the utility model;
[0027] Figure 5 is the structural schematic view of the front die, the rear die and the side core of the utility model;
[0028] Figure 6 is the structural schematic view of the die insert assembly and the core assembly of the utility model;
[0029] Figure 7 is the structural schematic view of the die whole of the utility model.
[0030] The reference signs and names in the drawing are as follows:
[0031] 10 die insert assembly; 11 front die; 12 rear die; 20 front die insert; 21 accessory groove; 22 auxiliary insert; 23 auxiliary through hole; 30 first insert block; 31 second insert block; 32 sliding groove; 33 notch step; 40 third insert block; 41 positioning part; 42 bending part; 50 core assembly; 51 side core; 52 rear core; 60 product shell; 61 PIN needle accessory; 62 pouring system; 63 guiding system; 64 forming system; 65 core pulling system; 66 cooling system. DETAILED DESCRIPTION
[0032] The technical scheme in the embodiments of the utility model will be described clearly and completely below, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.
[0033] Please refer to Figures 1 to 7The utility model discloses a kind of positioning mechanisms for preventing PIN needle from being dragged in mould, including the moulding cavity that is formed by the moulding cavity of each other of moulding insert assembly 10 and core assembly 50, moulding insert assembly 10 is equipped with front moulding insert 11 and rear moulding insert 12, core assembly 50 is equipped with side core 51 and rear core 52, two groups of side core 51 are formed by the side of each other of moulding cavity, front moulding insert 11 is equipped with front mould insert 20, front mould insert 20 forms the top surface of moulding cavity, one end of rear core 52 passes through rear moulding insert 12 and inserts into moulding cavity, with side core 51 and front mould insert 20 each other cooperation, form the internal cavity of moulding product;Front mould insert 20 is equipped with accessory groove 21, for placing and fixed PIN needle accessory 61, so that one end of PIN needle accessory 61 is inserted into moulding cavity, to be injection molded in one end of moulding product;Auxiliary insert 22 is equipped in accessory groove 21, auxiliary insert 22 is fixedly connected to front mould insert 20, and auxiliary through-hole 23 is equipped in it, for placing and fixed PIN needle accessory 61.
[0034] Specifically, when the charger shell is injection molded, the electric plug of the charger, PIN needle accessory 61, is synchronously injection molded in one end of the charger shell, so in the in-mould injection process, one end of PIN needle accessory 61 needs to be positioned in the moulding cavity so that it can be normally injection molded on the product shell 60. Front mould insert 20 is usually used to fix and position PIN needle accessory 61, but due to the precision of the injection molding machine, the precision of the mould processing, the difference in mould temperature, and the pressure during injection molding, the PIN needle will be in close contact with front mould insert 20. Because front mould insert 20 is in close contact with the PIN needle, the contact surface of front mould insert 20 and the PIN needle will rub when the mould is opened, which can easily cause the metal surface of the PIN needle to be dragged, affecting the appearance of the product.
[0035] Therefore, bronze auxiliary insert 22 can be embedded in the position where the hardware PIN needle is placed in front mould insert 20. Because the hardness of bronze is lower than that of metal iron or steel, when the hardware PIN needle is in close contact with bronze auxiliary insert 22 and the mould is opened, the friction of the contact surface will not cause the hardware PIN needle to be dragged, thereby improving the yield of product production.
[0036] Secondly, after adding bronze positioning auxiliary insert 22, the hole position of accessory groove 21 of front mould insert 20 can be empty, and the hardware PIN needle only contacts bronze auxiliary insert 22 when the mould is opened. Because the hardness of bronze is lower than that of metal iron or steel, the risk of the hardware PIN needle being dragged is reduced. Moreover, auxiliary through-hole 23 can be arranged in the middle part of bronze auxiliary insert 22, and auxiliary through-hole 23 is used to position PIN needle accessory 61.
[0037] In another embodiment, the auxiliary insert 22 has a material hardness lower than that of the PIN needle accessory 61.
[0038] Specifically, in order to avoid the auxiliary insert 22 causing damage or scratches on the surface of the metal PIN needle, it is preferred that the material of the auxiliary insert 22 has a lower hardness, such as lower than that of the metal PIN needle, so that the auxiliary insert 22 will not cause damage or scratches on the surface of the PIN needle during relative friction.
[0039] In yet another embodiment, the auxiliary insert 22 is made of bronze material.
[0040] Specifically, in the selection of the material of the auxiliary insert 22, it is preferred to use bronze material, which has a lower hardness than the metal hardness of the PIN needle, and the bronze material is also easy to cut, forge and operate, making it more convenient to process. In addition, even if the bronze material is worn out during long-term use, it can be re-melted and re-forged, reducing the use cost of the entire production process.
[0041] As shown in Figures 1 to 3 , preferably, the auxiliary insert 22 is provided with a first insert block 30 and a second insert block 31, and the first insert block 30 and the second insert block 31 are respectively provided with a sliding groove 32 at the middle part along the long edge direction, and the width of the sliding groove 32 matches the width of the PIN needle accessory 61, so that the PIN needle accessory 61 can be inserted into the sliding groove 32.
[0042] Specifically, in order to place and position the PIN needle accessory 61, it is preferred that the width of the sliding groove 32 is matched with the width of the PIN needle accessory 61. When the PIN needle accessory 61 is inserted into the sliding groove 32, it will not fall off, and the PIN needle accessory 61 can be positioned, and the PIN needle accessory 61 can normally separate from the sliding groove 32 when the mold is opened.
[0043] As shown in Figure 1 and Figure 2 , preferably, one side of the first insert block 30 and the second insert block 31 provided with the sliding groove 32 are butted against each other, so that the sliding grooves 32 of the two are matched to form the auxiliary through hole 23.
[0044] Specifically, in order to facilitate installation and replacement, it is preferred that the auxiliary insert 22 is provided with the first insert block 30 and the second insert block 31 butted against each other, and the sliding grooves 32 are respectively arranged at the butted positions of the two, so that the sliding grooves 32 can form corresponding auxiliary through holes 23 to place and position the PIN needle accessory 61.
[0045] As shown in Figures 1 to 4As shown, preferably, the auxiliary insert 22 is further provided with a third insert 40, one end of the third insert 40 is inserted into the auxiliary through hole 23 and limits the PIN pin accessory 61. The third insert 40 is embedded into the auxiliary through hole 23, and the two sides thereof abut against the slide groove 32 bottom surface of the first insert 30 and the second insert 31 respectively, so that the first insert 30 and the second insert 31 abut against the accessory groove 21 of the front mold insert 20 respectively and form an interference fit.
[0046] Specifically, in order to fix the auxiliary insert 22 in the accessory groove 21 of the front mold insert 20, the thickness of the third insert 40 can be set slightly thicker than the auxiliary through hole 23 composed of the slide groove 32 of the first insert 30 and the second insert 31, so that the third insert 40 forms a wedge-shaped structure, is embedded into the auxiliary through hole 23, and makes the first insert 30 and the second insert 31 expand slightly to the two sides, and forms an interference fit with the accessory groove 21 of the front mold insert 20.
[0047] As shown in Figure 2 and Figure 4 Preferably, the third insert 40 is set as an inverted L shape, one end of the third insert 40 inserted into the auxiliary through hole 23 is set as a positioning portion 41, the other end thereof forms a bent portion 42 bent by a certain angle, and the first insert 30 and the second insert 31 are provided with a notch step 33 corresponding to the position of the bent portion 42.
[0048] Specifically, in order to determine the position of the third insert 40, the notch step 33 can also be provided at the end of the first insert 30 and the second insert 31 away from the PIN pin accessory 61, so that the bent portion 42 of the third insert 40 can abut against the notch step 33, thereby forming positioning of the third insert 40 itself. Moreover, when the bent portion 42 of the third insert 40 abuts against the notch step 33, the positioning portion 41 of the third insert 40 is just inserted into the auxiliary through hole 23 to limit and position the PIN pin accessory 61, thereby determining the depth of the PIN pin accessory 61 inserted into the product shell 60 and ensuring compliance with production requirements.
[0049] In addition, in order to form a complete injection mold, the existing mold systems such as a pouring system 62, a guide system 63, a forming system 64, a core-pulling system 65, an ejection system, a cooling system 66, etc. can also be provided.
[0050] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.
Claims
1. A positioning mechanism for preventing a pin from being damaged by a mold, characterized by, The application relates to a mold core assembly (50) and a mold pin assembly (10) which are combined to form an injection molding cavity, wherein the mold pin assembly (10) is provided with a front mold pin (11) and a rear mold pin (12), the mold core assembly (50) is provided with side mold cores (51) and a rear mold core (52), two groups of the side mold cores (51) are combined to form the side of the injection molding cavity, the front mold pin (11) is provided with a front mold insert (20) which forms the top of the injection molding cavity, one end of the rear mold core (52) penetrates through the rear mold pin (12) and is inserted into the injection molding cavity, cooperates with the side mold cores (51) and the front mold insert (20) to form the internal cavity of the injection molded product, the front mold insert (20) is provided with an accessory groove (21) for placing and fixing a PIN accessory (61), so that one end of the PIN accessory (61) penetrates into the injection molding cavity and is injection molded at one end of the injection molded product, the accessory groove (21) is provided with an auxiliary insert (22), the auxiliary insert (22) is fixed to the front mold insert (20) and is provided with an auxiliary through hole (23) in the front mold insert (20) for placing and fixing the PIN accessory (61).
2. The pin preventing mechanism according to claim 1, wherein The material hardness of the auxiliary insert (22) is lower than that of the PIN accessory (61).
3. The pin preventing mechanism according to claim 2, wherein The auxiliary insert (22) is made of bronze.
4. The pin preventing mechanism according to claim 1, wherein The auxiliary insert (22) is provided with a first insert block (30) and a second insert block (31), the middle parts of the first insert block (30) and the second insert block (31) along the long edge direction are respectively provided with sliding grooves (32), the width of the sliding grooves (32) matches that of the PIN accessory (61), so that the PIN accessory (61) can be inserted into the sliding grooves (32).
5. The pin preventing mechanism according to claim 4, wherein The sides of the first insert block (30) and the second insert block (31) provided with the sliding grooves (32) are abutted to each other, so that the sliding grooves (32) of the first insert block (30) and the second insert block (31) are matched to form the auxiliary through hole (23).
6. The pin preventing mechanism according to claim 5, wherein The auxiliary insert (22) is further provided with a third insert block (40), one end of the third insert block (40) is inserted into the auxiliary through hole (23) and limits the PIN accessory (61).
7. The pin preventing mechanism according to claim 6, wherein The third insert block (40) is embedded into the auxiliary through hole (23), and the two sides of the third insert block (40) are respectively abutted to the bottom surfaces of the sliding grooves (32) of the first insert block (30) and the second insert block (31), so that the first insert block (30) and the second insert block (31) are respectively abutted to the accessory groove (21) of the front mold insert (20) and form an interference fit.
8. The pin preventing mechanism according to claim 7, wherein The third insert block (40) is provided in an inverted L shape, one end of the third insert block (40) inserted into the auxiliary through hole (23) is provided as a positioning part (41), the other end of the third insert block (40) is provided as a bent part (42) which is bent by a certain angle, and the first insert block (30) and the second insert block (31) are provided with notch steps (33) corresponding to the positions of the bent part (42).