Mold core convenient for mold opening

Abstract

The utility model relates to the technical field of injection molds, and discloses a mold core convenient for mold opening, which comprises a fixed mold core and a movable mold core, at least one injection molding hole is formed in the fixed mold core; a plurality of air holes are formed in the movable mold core; when the fixed mold core and the movable mold core are closed, a mold cavity is defined by the fixed mold core and the movable mold core, the injection molding hole is communicated with the mold cavity and is used for injecting molten plastic into the mold cavity, an exhaust gap for communicating the air hole with the mold cavity is formed between one end of the air hole and the fixed mold core, and the other end of the air hole is communicated with the outside; when the fixed mold core and the movable mold core are opened, one end of the air hole is communicated with an external air source, and air enters the air hole so as to drive the movable mold core to move in the direction away from the fixed mold core. The mold core convenient to open the mold can solve the problem of how to improve the mold opening efficiency and the surface quality of a plastic product.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold technical field, concretely relates to a moulding core convenient to open mould. BACKGROUND

[0002] Moulding core, as the core component in injection mold, directly determines the shape, size and quality of the final product. However, in actual operation, the moulding core opening and closing process faces many technical problems, which not only affects the production efficiency, but also may lead to the decline of product quality.

[0003] Moulding core is usually composed of fixed moulding core and movable moulding core, which together enclose a closed cavity in the closed mould state, for filling and cooling solidification of molten plastic. In this process, molten plastic is injected into the cavity under high pressure to form the required product shape. However, there is often a lot of air in the cavity, if the air in the cavity cannot be discharged in time, it will cause the molten plastic to be unable to completely fill the cavity, thus forming defects such as air marks, air lines, shrinkage, fusion line on the surface of plastic products, affecting the forming quality of products.

[0004] In addition, the opening process also faces severe technical challenges. In the injection molding process, after the plastic in the cavity cools and solidifies, a negative pressure state will be formed inside the cavity, resulting in strong adsorption force between the fixed moulding core and the movable moulding core, making the opening process extremely difficult. In order to overcome this adsorption force, the movable moulding core driving mechanism often needs to exert a force far exceeding the normal requirement, which not only increases the opening time and energy consumption, but also may cause deformation, damage and other damage to the moulding core itself, and even may affect the forming quality and size accuracy of products, thus reducing the product qualification rate.

[0005] In view of the above problems, it is necessary to develop a moulding core convenient to open mould, which not only can effectively discharge the air in the cavity during injection molding, but also can realize the stable and rapid separation of the moulding core during the opening process. TECHNICAL CONTENT

[0006] (I) Technical problems solved

[0007] The utility model provides a moulding core convenient to open mould, at least can solve the technical problem: how to improve the opening efficiency and the surface quality of plastic product.

[0008] (II) Technical scheme

[0009] In order to solve the above technical problems, the utility model provides the following technical scheme: a moulding core convenient to open mould, comprising:

[0010] Fixed moulding core, at least one injection hole is arranged on the fixed moulding core;

[0011] The movable mold core is provided with a plurality of air holes;

[0012] When the fixed mold core and the movable mold core are closed, the fixed mold core and the movable mold core form a mold cavity, the injection hole is communicated with the mold cavity and is used for injecting molten plastic into the mold cavity, one end of the air hole and the fixed mold core form an exhaust gap for communicating the air hole and the mold cavity, and the other end is communicated with the outside world.

[0013] When the fixed mold core and the movable mold core are opened, one end of the air hole is communicated with the external gas source and air is introduced to drive the movable mold core to move away from the fixed mold core.

[0014] Further setting, the aforementioned mold core convenient for opening mold further includes a connecting valve, the connecting valve includes three connecting ends, the three connecting ends are communicated with the air hole, the external gas source and the outside world respectively, and the connecting valve is used for controlling the air hole to be communicated with the external gas source or the outside world.

[0015] Further setting, the aforementioned mold core convenient for opening mold further includes a flow distribution plate, which is fixed to the side of the movable mold core away from the fixed mold core, the flow distribution plate is provided with a connecting hole and a distribution groove which are communicated with each other, the distribution groove is communicated with one end of each air hole, and the connecting valve is arranged on the outer side of the flow distribution plate, one of the connecting ends of the connecting valve is communicated with the connecting hole, so as to be communicated with the air hole.

[0016] Further setting, the aforementioned movable mold core is provided with a mounting groove on the side away from the fixed mold core, the mounting groove is matched with the flow distribution plate in shape and size, is used for accommodating the flow distribution plate, and makes the outer side surface of the flow distribution plate flush with the side surface of the movable mold core away from the fixed mold core.

[0017] Further setting, the aforementioned fixed mold core and the movable mold core are provided with at least one guide structure, the guide structure is used for guiding the moving direction of the fixed mold core when the fixed mold core is opened and closed, and includes a guide convex part and a guide concave part which are matched with each other, the guide convex part and the guide concave part are arranged on the two sides of the fixed mold core and the movable mold core respectively.

[0018] Further setting, the aforementioned fixed mold core and the movable mold core are provided with a sealing structure, the sealing structure is located outside the mold cavity and is used for sealing the mold cavity in the closed state.

[0019] (Three) beneficial effects

[0020] Compared with the prior art, the mold core convenient for opening mold provided by the utility model has the following beneficial effects:

[0021] 1、The mold core provided by the utility model is communicated with the outside world when the mold core is closed, so that the air in the mold cavity can be discharged in time through the air hole and the exhaust gap during the injection process, so that the molten plastic can completely fill the mold cavity, thereby effectively improving the surface quality of the plastic product and greatly reducing the defective rate of the plastic product.

[0022] 2. The mold core provided by the utility model is communicated with external air source and takes in air when opening mold, and drives the movable mold core to move away from the fixed mold core together with the pneumatic auxiliary movable mold core driving mechanism, so as to open the mold cavity stably and quickly, effectively improves the opening mold efficiency, reduces the energy consumption of the movable mold core driving mechanism, and compared with the mechanical driving mode, can effectively avoid damaging the mold core and product, so as to ensure the integrity and precision of the mold core and product. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The three-dimensional view of the mold core for facilitating mold opening in the embodiment in the mold closing state;

[0024] Figure 2 The first position sectional view of the mold core for facilitating mold opening in the embodiment in the mold closing state;

[0025] Figure 3 The second position sectional view of the mold core for facilitating mold opening in the embodiment in the mold closing state;

[0026] Figure 4 The structural sectional view of the fixed mold core, the movable mold core and the flow distribution plate in the embodiment;

[0027] Figure 5 The three-dimensional view of the movable mold core in the embodiment.

[0028] REFERENCE NUMERALS:

[0029] 1. Fixed mold core; 11. Injection hole;

[0030] 2. Movable mold core; 21. Air hole; 22. Mounting groove; 23. Needle through hole;

[0031] 3. Mold cavity;

[0032] 4. Flow distribution plate; 41. Connection hole; 42. Distribution groove;

[0033] 5. Connection valve; 51. Connection end;

[0034] 6. Guide structure; 61. Guide convex part; 62. Guide concave part;

[0035] 7. Sealing groove; 8. Exhaust gap. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0037] The utility model provides a kind of moulding cavity convenient to open mould, to solve how to improve the efficiency of opening mould and the surface quality of plastic product problem.

[0038] Referring to Figure 1 、 Figure 2 And Figure 3 As shown in Figure 1 for the embodiment convenient to open mould of moulding cavity in the stereogram of moulding, Figure 2 for the embodiment convenient to open mould of moulding cavity in the first position section view of moulding, Figure 3 for the embodiment convenient to open mould of moulding cavity in the second position section view of moulding, the convenient to open mould of moulding cavity includes fixed moulding cavity 1 and movable moulding cavity 2.

[0039] Fixed moulding cavity 1 has at least one injection hole 11.

[0040] Movable moulding cavity 2 has several air holes 21.

[0041] Wherein, when fixed moulding cavity 1 and movable moulding cavity 2 are moulded, fixed moulding cavity 1 and movable moulding cavity 2 are enclosed to form moulding cavity 3.Injection hole 11 is communicated with moulding cavity 3, and is used to inject molten plastic into moulding cavity 3.The other end of air hole 21 and fixed moulding cavity 1 form exhaust gap 8, and exhaust gap 8 is used to communicate air hole 21 and moulding cavity 3.The other end of air hole 21 is communicated with the outside, to facilitate the gas discharge in moulding cavity 3.

[0042] When fixed moulding cavity 1 and movable moulding cavity 2 are opened, one end of air hole 21 is communicated with external gas source and admits air, to drive movable moulding cavity 2 to move away from fixed moulding cavity 1.

[0043] The moulding cavity provided by the above technical scheme can discharge air in moulding cavity 3 in time through air hole 21 and exhaust gap 8 during injection molding, so that molten plastic can completely fill moulding cavity 3, thereby effectively improving the surface quality of plastic product, greatly reducing the rejection rate of plastic product;When opening mould, the air admission mode of air hole 21 can drive movable moulding cavity 21 to move away from fixed moulding cavity 1 together with movable moulding cavity driving mechanism, so as to smoothly and quickly open moulding cavity 3, effectively improve the efficiency of opening mould, and reduce the energy consumption of movable moulding cavity driving mechanism, and compared with mechanical driving mode, the pneumatic mode can effectively avoid damage to moulding cavity and product, so as to ensure the integrity and precision of moulding cavity and plastic product.

[0044] The above external gas source can use any existing gas supply equipment to provide any clean gas.

[0045] The distribution position of the gas holes 21 on the movable die core 2 is relatively uniform, so that the gas holes 21 can uniformly and quickly exhaust the gas in the mold cavity 3 during the injection molding process, improving the surface quality of the plastic product. When the mold is opened, the gas holes 21 can generate uniform and sufficient air pressure difference to smoothly and quickly open the mold cavity 3.

[0046] The number and position of the injection holes 11 can be set according to the injection molding requirements of the mold cavity 3 to ensure that the molten plastic can uniformly and sufficiently fill the mold cavity 3 when the mold is closed.

[0047] The movable die core 2 also has a ejector pin hole 23 that communicates with the mold cavity 3 for the ejector pin to pass through to push the cooled and solidified plastic product out of the mold cavity 3.

[0048] The size of the exhaust gap 8 should not be designed too large, otherwise a large amount of molten plastic will flow into the exhaust gap 8, blocking the gas holes 21 after solidification, thereby affecting the mold opening.

[0049] Referring to Figure 4 As shown, Figure 4 For the structure sectional view of the fixed die core, the movable die core and the flow distribution plate in the embodiment, on the basis of the above embodiment, the mold core for facilitating mold opening further comprises a connecting valve 5. The connecting valve 5 comprises three connecting ends 51, which are respectively connected with the gas holes 21, the external gas source and the outside. The connecting valve 5 is used to control the communication of the gas holes 21 with the external gas source or the outside. In this way, during the injection molding process, the connecting valve 5 controls the communication of the gas holes 21 with the outside, so that the gas holes 21 can timely exhaust the air in the mold cavity 3; when the mold is opened, the connecting valve 5 controls the communication of the gas holes 21 with the external gas source, so that the gas holes 21 can intake air. It can be seen that the mold core for facilitating mold opening can flexibly switch between exhaust and intake through the connecting valve 5, which is convenient to operate.

[0050] The connecting valve 5 can use an existing three-way electromagnetic valve, which can be remotely controlled by an electric signal to switch the state of the connecting end 51, so as to cooperate with the mold opening and closing process of the mold core.

[0051] Referring to Figure 4As shown, on the basis of the above embodiment, the mold core convenient to open mold also includes a flow distribution plate 4. The flow distribution plate 4 is fixed to the side of the movable mold core 2 away from the fixed mold core 1 by screwing or bonding, etc. The flow distribution plate 4 has a connecting hole 41 and a distribution groove 42 which are in communication with each other. The distribution groove 42 is in communication with one end of each gas hole 21. The connecting valve 5 is installed on the outside of the flow distribution plate 4, and one of the connecting ends 51 is in communication with the connecting hole 41, thereby being in communication with the gas hole 21. In this way, when the mold is opened, the gas provided by the external gas source can be uniformly distributed to each gas hole 21 through the connecting hole 41 and the distribution groove 42 of the flow distribution plate 4. Thus, only one external gas source and one connecting valve 5 are needed to supply gas to multiple gas holes 21 and switch the gas inlet, thereby realizing uniform distribution and efficient transmission of the gas, and greatly saving the gas supply cost.

[0052] Referring to Figure 4 As shown, on the basis of any of the above embodiments, the side of the movable mold core 2 away from the fixed mold core 1 has a mounting groove 22. The shape and size of the mounting groove 22 match those of the flow distribution plate 4, which is used to accommodate the flow distribution plate 4 and make the outer side surface of the flow distribution plate 4 flush with the side surface of the movable mold core 2 away from the fixed mold core 1. In this way, the mounting groove 22 makes the flow distribution plate 4 not protrude from the movable mold core 2, which not only improves the aesthetics of the mold core, but also effectively avoids interference between the flow distribution plate 4 and the mounting part of the movable mold core 2 due to protrusion, thereby affecting the normal use of the mold core.

[0053] Referring to Figure 1 and Figure 5 As shown, Figure 5 The figure is a perspective view of the movable mold core 2 in the embodiment. On the basis of any of the above embodiments, the fixed mold core 1 and the movable mold core 2 have at least one guide structure 6. The guide structure 6 is used to guide the moving direction of the fixed mold core 1 when opening and closing the mold. The guide structure 6 includes a guide convex part 61 and a guide concave part 62 which match each other, and the guide convex part 61 and the guide concave part 62 are respectively located on the two sides of the fixed mold core 1 and the movable mold core 2 facing each other. In this way, the guide structure 6 can guide the smooth movement of the fixed mold core 1 in a predetermined direction during the closing and opening of the mold, thereby ensuring the opening and closing precision and stability of the mold core.

[0054] Referring to Figure 5 As shown, on the basis of any of the above embodiments, the fixed mold core 1 and the movable mold core 2 have a sealing structure, which is located outside the mold cavity 3 and is used to close the mold cavity 3 in the closed mold state. In this way, the sealing structure can ensure the sealing performance of the mold cavity 3 in the closed mold state, while allowing the existence of the exhaust gap 8 for gas discharge, effectively preventing the leakage of molten plastic from between the fixed mold core 1 and the movable mold core 2, and the sealing structure can also reduce the friction resistance between the fixed mold core 1 and the movable mold core 2 during the opening of the mold, thereby improving the service life and opening and closing efficiency of the mold.

[0055] The sealing structure can use a sealing member such as a rubber sealing ring, which is placed or adhered on the sealing groove 7 of the movable die core 2 and surrounds the mold cavity 3, so as to seal the mold cavity 3.

[0056] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A mold core facilitating mold opening, characterized by, The utility model relates to a convenient mold opening mold core which comprises: a fixed mold core provided with at least one injection hole; a movable mold core provided with a plurality of air holes; wherein, when the fixed mold core and the movable mold core are closed, the fixed mold core and the movable mold core form a mold cavity, the injection hole is communicated with the mold cavity and is used for injecting molten plastic into the mold cavity, one end of the air hole and the fixed mold core form an exhaust gap for communicating the air hole and the mold cavity, and the other end is communicated with the outside world; when the fixed mold core and the movable mold core are opened, one end of the air hole is communicated with an external air source and air is introduced to drive the movable mold core to move away from the fixed mold core.

2. The core for facilitating mold opening of claim 1, wherein, The mold core convenient for mold opening further comprises a connecting valve, the connecting valve comprises three connecting ends, the three connecting ends are respectively communicated with the air hole, the external air source and the outside world, and the connecting valve is used for controlling the air hole to be communicated with the external air source or the outside world.

3. The core for facilitating mold opening of claim 2, wherein, The mold core convenient for mold opening further comprises a flow distribution plate fixed to the side of the movable mold core away from the fixed mold core, the flow distribution plate is provided with a connecting hole and a distribution groove communicated with each other, the distribution groove is communicated with one end of each air hole, and the connecting valve is arranged on the outside of the flow distribution plate, one of the connecting ends is communicated with the connecting hole, so as to be communicated with the air hole.

4. The core for facilitating mold opening of claim 3, wherein, The side of the movable mold core away from the fixed mold core is provided with a mounting groove, the shape and size of the mounting groove are matched with the flow distribution plate, the mounting groove is used for accommodating the flow distribution plate, and the outside of the flow distribution plate is flush with the side of the movable mold core away from the fixed mold core.

5. The core for facilitating mold opening according to any one of claims 1 to 4, wherein At least one guide structure is arranged between the fixed mold core and the movable mold core, the guide structure is used for guiding the moving direction of the fixed mold core when the mold is opened and closed, and comprises a guide convex part and a guide concave part matched with each other, the guide convex part and the guide concave part are arranged on the two sides of the fixed mold core and the movable mold core respectively.

6. The core for facilitating mold opening according to any one of claims 1 to 4, wherein A sealing structure is arranged between the fixed mold core and the movable mold core, the sealing structure is located outside the mold cavity and is used for sealing the mold cavity in the closed state.

Images