Core pulling mechanism
By increasing the number of cores and improving the structure in the mold core-pulling mechanism, the problem of insufficient core-pulling avoidance caused by insufficient core quantity was solved, thus improving the product qualification rate.
Patent Information
- Application Number
- CN202423285321.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2034-12-30
AI Technical Summary
The existing mold core-pulling mechanism has an insufficient number of cores, resulting in inadequate core-pulling avoidance in the undercut area. This makes the product easily damaged or deformed, leading to a low pass rate.
The number of cores in the core-pulling mechanism is increased by setting at least four movable cores (first core, second core, third core, and fourth core) to improve the core-pulling avoidance capability. This includes a moving mold assembly, a first mold assembly, a fixed mold assembly, and multiple movable cores. The movement and limiting of the cores are achieved using springs and limit bolts.
By increasing the number of cores and improving the structure, more thorough core-pulling avoidance was achieved, thus improving the product qualification rate.
Smart Images
Figure CN223802998U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of molds, in particular to a core pulling mechanism. BACKGROUND
[0002] The core pulling in a mold refers to a structure for processing a position (for example, a position where a reverse buckle is located) that cannot be demolded on a product parting surface, and is used for ensuring smooth demolding of a product.
[0003] Because the fixed mold and the movable mold each have only one core, the number of cores is small, so that the core pulling mechanism cannot fully avoid the reverse buckle demolding position, causing the product to be easily damaged or deformed when the core pulling mechanism is used to demold the reverse buckle area, so that the precise size of the reverse buckle area of the product cannot be within the tolerance or the product is deformed and distorted, thereby reducing the qualification rate of the product. CONTENT OF THE UTILITY MODEL
[0004] The application aims to provide a core pulling mechanism that can fully avoid the core pulling mechanism, comprising a movable mold assembly, a first mold assembly, a first core, a second core, a fixed mold assembly, a second mold assembly, a third core and a fourth core. The first mold assembly and the movable mold assembly are in abutment. The first core is connected to the movable mold assembly, and the first core is movably arranged in the first mold assembly. The second core is connected to the movable mold assembly, and the second core is movably arranged in the first mold assembly, and the first core and the second core are arranged apart from each other.
[0005] The second mold assembly and the fixed mold assembly are in abutment. The third core is connected to the fixed mold assembly, and the third core is movably arranged in the second mold assembly. The fourth core is connected to the fixed mold assembly, and the fourth core is movably arranged in the second mold assembly, and the third core and the fourth core are arranged apart from each other. The first mold assembly, the first core, the second core, the second mold assembly, the third core and the fourth core are used to form a cavity of a product, and the first core, the second core, the third core and the fourth core are also used to form a reverse buckle area of the cavity.
[0006] Optionally, the movable die assembly comprises a movable plate, a first movable plate and a first spring. The first movable plate abuts against the movable plate, and the first core and the second core are clamped to the first movable plate. One end of the first spring abuts against the first movable plate, and the first spring is configured to drive the first movable plate away from the first die assembly.
[0007] Optionally, the movable die assembly further comprises a first limiting bolt and a second movable plate. The first limiting bolt is arranged in the first movable plate, and the first limiting bolt is configured to prevent the first movable plate from continuously moving after the first movable plate moves a predetermined distance. The second movable plate abuts against one end of the first spring away from the first movable plate, and the first core and the second core are arranged in the second movable plate. The first limiting bolt is fixed to the second movable plate.
[0008] Optionally, the first die assembly comprises a first die body and a second spring. The second movable plate is embedded in the first die body and is slidable relative to the first die body. The first core and the second core are arranged in the first die body and are movable relative to the first die body. The first die body, the first core, the second core, the second die assembly, the third core and the fourth core are configured to form the cavity. Two ends of the second spring abut against the movable plate and the first die body respectively, and the second spring is configured to drive the first die body away from the second movable plate.
[0009] Optionally, the first die body comprises a lower die and a fifth core. The fifth core is connected to the second movable plate. The first core, the second core and the fifth core are arranged in the lower die. The lower die, the first core, the second core, the second die assembly, the third core, the fourth core and the fifth core are configured to form the cavity. The fifth core is further configured to form an undercut region of the cavity.
[0010] Optionally, the fixed die assembly comprises a fixed plate assembly, a third movable plate and a third spring. The third movable plate abuts against the fixed plate assembly, and the third core and the fourth core are clamped to the third movable plate. One end of the third spring abuts against the third movable plate, and the third spring is configured to drive the third movable plate away from the second die assembly.
[0011] Optionally, the fixed die assembly further comprises a second limiting bolt and a fourth movable plate. The second limiting bolt is arranged in the third movable plate, and the second limiting bolt is used to prevent the third movable plate from continuing to move after the third movable plate moves a predetermined distance. The fourth movable plate is arranged at one end of the third spring away from the third movable plate, the third core and the fourth core are arranged in the fourth movable plate, and the second limiting bolt is fixed to the fourth movable plate.
[0012] Optionally, the second die assembly comprises a second die body and a fourth spring. The fourth movable plate is embedded in the second die body and is slidable relative to the second die body. The third core and the fourth core are arranged in the second die body and are movable relative to the second die body. The first die assembly, the first core, the second core, the second die body, the third core, and the fourth core are used to form the cavity. The two ends of the fourth spring are arranged against the fixed plate assembly and the second die body respectively, and the fourth spring is used to drive the second die body away from the fourth movable plate.
[0013] Optionally, the second die body comprises an upper die and a sixth core, the sixth core is connected with the fourth movable plate, the third core, the fourth core and the sixth core are arranged in the upper die, the first die assembly, the first core, the second core, the upper die, the third core, the fourth core and the sixth core are used to form the cavity, and the sixth core is also used to form the undercut area of the cavity.
[0014] Optionally, the first die assembly comprises a fifth core, the fifth core is used to form the undercut area of the cavity, and the fifth core and the sixth core are arranged apart from each other.
[0015] The beneficial effects of the present application are as follows: by arranging the movable die assembly, the first die assembly, the first core, the second core, the fixed die assembly, the second die assembly, the third core and the fourth core, the first die assembly and the movable die assembly are abutted. The first core is connected with the movable die assembly, the first core is arranged in the first die assembly and is movable relative to the first die assembly. The second core is connected with the movable die assembly, the second core is arranged in the first die assembly and is movable relative to the first die assembly, and the first core and the second core are arranged apart from each other.
[0016] Since at least four cores, i.e., the first core, the second core, the third core and the fourth core, are arranged in the core-pulling mechanism, the number of cores is increased, the core-pulling avoidance capability in the undercut area is improved, the core-pulling avoidance of the core-pulling mechanism is more sufficient, and thus the qualified rate of products is improved.
[0017] The above description is only a summary of the technical scheme of the present application. In order to make the technical means of the present application clearer and to enable the present application to be implemented according to the content of the description, the present application is described in detail below with reference to the preferred embodiments of the present application and in conjunction with the drawings. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 is a perspective view of the core pulling mechanism (the core pulling mechanism is in the state of not pulling the core and not opening the mold) in an embodiment of the present application;
[0019] Figure 2 is a semi-partial view of the core pulling mechanism (the partial of the moving plate and the second body are omitted, the core pulling mechanism is in the state of not pulling the core and not opening the mold, the cutting plane and the central axis of each core are coplanar) in an embodiment of the present application;
[0020] Figure 3 is a semi-partial view of the core pulling mechanism (the first core, the second core, the third core and the fourth core are in the state of completing the core pulling, the fifth core and the sixth core are in the state of not being pulled, the core pulling mechanism is in the state of not opening the mold, the cutting plane and the central axis of each core are coplanar) in an embodiment of the present application;
[0021] Figure 4 is a stepped partial view of the core pulling mechanism (each core is in the state of completing the core pulling, the cutting plane and the central axis of each core are coplanar, and the cutting plane and the central axis of the first spring and the central axis of the third spring are coplanar, the core pulling mechanism is in the state of not opening the mold) in an embodiment of the present application;
[0022] Figure 5 is a partial exploded view of the core pulling mechanism in an embodiment of the present application;
[0023] Figure 6 is a partial exploded view of the core pulling mechanism in an embodiment of the present application;
[0024] Figure 7 is a partial exploded view of the core pulling mechanism in an embodiment of the present application, Figure 3 is a partial enlarged view of A1 direction and A2 direction of the core pulling mechanism;
[0025] Figure 8 is a partial enlarged view of B1 direction and B2 direction of the core pulling mechanism; Figure 4
[0026] Figure 9 is a stepped partial view of the core pulling mechanism (each core is in the state of completing the core pulling, the cutting plane and the central axis of each core are coplanar, and the cutting plane and the central axis of the first spring and the central axis of the third spring are coplanar, the core pulling mechanism is in the state of not opening the mold) in an embodiment of the present application.
[0027] In the drawings, the reference signs are as follows:
[0028] 101 moving die assembly
[0029] 1010 moving plate
[0030] 1011 first moving plate
[0031] 1012 first spring
[0032] 1013 first stop bolt
[0033] 1014 second moving plate
[0034] 102 first die assembly
[0035] 1020 first die body
[0036] 10200 lower die
[0037] 10201 first body
[0038] 1021 second spring
[0039] 1031 first core
[0040] 1032 second core
[0041] 1033 third core
[0042] 1034 fourth core
[0043] 1035 fifth core
[0044] 1036 sixth core
[0045] 104 fixed die assembly
[0046] 1040 third moving plate
[0047] 1041 third spring
[0048] 1042 second stop bolt
[0049] 1043 fourth moving plate
[0050] 105 second die assembly
[0051] 1050 second die body
[0052] 10500 upper die
[0053] 10501 second body
[0054] 1051 fourth spring
[0055] 106 fixed plate assembly
[0056] 1060 middle fixed plate
[0057] 1061 fixed plate body
[0058] 1062 lower movable plate
[0059] 1063 support column
[0060] 1070 top needle
[0061] 108 product DETAILED DESCRIPTION
[0062] The present application is explained by specific embodiments, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present specification.
[0063] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. In order to enable those skilled in the art to better understand the present application scheme, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.
[0064] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to include only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to the process, method, product or device.
[0065] It should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0066] For the convenience of description, a rectangular coordinate system O-XYZ is established in some of the drawings. Let the X axis be parallel to the length direction of the core-pulling mechanism, let the Y axis be parallel to the width direction of the core-pulling mechanism, and let the Z axis be parallel to the height direction of the core-pulling mechanism. The positive direction of the X axis, the positive direction of the Y axis, and the positive direction of the Z axis remain the same in each drawing with a coordinate system.
[0067] Please refer to Figure 1 and Figure 2 In this embodiment, a core-pulling mechanism is provided, which includes a movable die assembly 101, a first die assembly 102, a first core 1031, a second core 1032, a fixed die assembly 104, a second die assembly 105, a third core 1033, and a fourth core 1034. The first die assembly 102 and the movable die assembly 101 abut. The first core 1031 and the movable die assembly 101 are connected, and the first core 1031 is arranged through the first die assembly 102 and is movable relative to the first die assembly 102. The second core 1032 and the movable die assembly 101 are connected, and the second core 1032 is arranged through the first die assembly 102 and is movable relative to the first die assembly 102. The first core 1031 and the second core 1032 are arranged apart from each other. The second die assembly 105 and the fixed die assembly 104 abut.
[0068] Please refer to Figure 1 and Figure 2 The third core 1033 and the fixed die assembly 104 are connected, and the third core 1033 is arranged through the second die assembly 105 and is movable relative to the second die assembly 105. The fourth core 1034 and the fixed die assembly 104 are connected, and the fourth core 1034 is arranged through the second die assembly 105 and is movable relative to the second die assembly 105. The third core 1033 and the fourth core 1034 are arranged apart from each other. The first die assembly 102, the first core 1031, the second core 1032, the second die assembly 105, the third core 1033, and the fourth core 1034 are used to form a cavity of a product 108 (the product 108 is described with reference to Figure 3 ).
[0069] As shown in Figure 2 , because at least four cores, i.e., the first core 1031, the second core 1032, the third core 1033, and the fourth core 1034, are arranged in the core-pulling mechanism, the number of cores is increased, the core-pulling avoidance capability in the undercut area is improved, the core-pulling avoidance of the core-pulling mechanism is more sufficient, and thus the pass rate of the product 108 (the product 108 is described with reference to Figure 3 ) is improved.
[0070] Please refer to Figure 1 and Figure 2The top end of the first core 1031 and the top end of the second core 1032 can be clamped to the movable die assembly 101. The bottom end of the third core 1033 and the bottom end of the fourth core 1034 can be clamped to the fixed die assembly 104. The length direction of the first core 1031, the length direction of the second core 1032, the length direction of the third core 1033, and the length direction of the fourth core 1034 can be arranged parallel to each other (for example, parallel to the Z axis). The movable die assembly 101, the first mold assembly 102, the second mold assembly 105, and the fixed die assembly 104 can be sequentially abutted from top to bottom. The first core 1031 can be arranged outside the second core 1032, and the third core 1033 can be arranged outside the fourth core 1034.
[0071] Please refer to Figure 3 and Figure 4 , optionally, the movable die assembly 101 (the movable die assembly 101 please refer to Figure 1 ) includes a movable plate 1010, a first movable plate 1011, and a first spring 1012. The first movable plate 1011 abuts against the movable plate 1010, and the first core 1031 and the second core 1032 are clamped to the first movable plate 1011. One end of the first spring 1012 abuts against the first movable plate 1011, and the first spring 1012 is used to drive the first movable plate 1011 away from the first mold assembly 102 (the first mold assembly 102 please refer to Figure 1 ). In this way, the first movable plate 1011 can drive each first core 1031 and each second core 1032 to move simultaneously to simultaneously realize the core pulling of each first core 1031 and each second core 1032.
[0072] As shown in Figure 3 , the top surface of the movable plate 1010 can be connected with the mold closing device of the injection molding machine. The mold closing device can drive the movable plate 1010 to move upward (for example, move upward in a direction parallel to the Z axis). The movable plate 1010 can be arranged above the first movable plate 1011. The top surface of the first movable plate 1011 can abut against the bottom surface of the movable plate 1010. The movable plate 1010 and the first movable plate 1011 can be cuboids. The first movable plate 1011 can move up and down relative to the movable plate 1010.
[0073] As shown in Figure 3As shown, the top ends of the first core 1031 and the second core 1032 can be engaged with the first movable plate 1011. For example, the diameter of the top end of the first core 1031 is larger than the diameter of the rod portion of the first core 1031. The first movable plate 1011 is provided with a hole of the same diameter as the rod portion of the first core 1031 for the rod portion of the first core 1031 to pass through, thereby enabling the first core 1031 to be engaged with the first movable plate 1011. Similarly, the diameter of the top end of the second core 1032 is larger than the diameter of the rod portion of the second core 1032. The first movable plate 1011 is provided with a hole of the same diameter as the rod portion of the second core 1032 for the rod portion of the second core 1032 to pass through.
[0074] like Figure 4 As shown, the upper end of the first spring 1012 can abut against the first movable plate 1011. The first spring 1012 can drive the first movable plate 1011 away from the second movable plate 1014. For example, the upper end of the first spring 1012 can abut against the first movable plate 1011, and the lower end of the first spring 1012 can abut against the second movable plate 1014. The number of first springs 1012 can be four, with two located on the left and the remaining two on the right. In this embodiment, the product 108 is formed by a four-cavity mold, meaning that four identical products 108 are injection molded in one operation.
[0075] Please also refer to Figure 3 , Figure 5 , Figure 6 and Figure 7 Optional, moving mold assembly 101 (please refer to the moving mold assembly 101) Figure 1 The system also includes a first limiting bolt 1013 and a second movable plate 1014. The first limiting bolt 1013 passes through the first movable plate 1011 and is used to prevent the first movable plate 1011 from moving further after it has moved a predetermined distance d1. The second movable plate 1014 abuts against the end of the first spring 1012 away from the first movable plate 1011. The first core 1031 and the second core 1032 pass through the second movable plate 1014, and the first limiting bolt 1013 is fixed to the second movable plate 1014. With this configuration, after the first core 1031 and the second core 1032 are pulled into place, the second movable plate 1014 can prevent the first movable plate 1011 from being bounced upward by the first spring 1012 by the first limiting bolt 1013.
[0076] Please also refer to Figures 5 to 7, the rod portion of the first limiting bolt 1013 can be screwed with the top surface of the second movable plate 1014, and the head portion of the first limiting bolt 1013 can abut against the top surface of the first movable plate 1011 when limiting. The rod portion of the first limiting bolt 1013 can be arranged in the first movable plate 1011. The distance between the bottom surface of the head portion of the first limiting bolt 1013 and the top surface of the second movable plate 1014 minus the thickness of the first movable plate 1011 is the predetermined distance d1 that the first movable plate 1011 can move. After the first movable plate 1011 moves the predetermined distance d1, each first core 1031 and each second core 1032 can be extracted, so that each first core 1031 and each second core 1032 are separated from the formed product 108 (the product 108 is described with reference to Figure 9 ) and are not in contact.
[0077] Please refer to Figure 3 and Figure 5 , the top surface of the second movable plate 1014 can abut against the lower end of the first spring 1012. Each first core 1031 and each second core 1032 can slide up and down relative to the second movable plate 1014 (for example, each first core 1031 and each second core 1032 can slide up and down along a direction parallel to the Z axis).
[0078] Please refer to Figure 1 and Figure 2 , optionally, the first mold assembly 102 includes a first mold body 1020 and a second spring 1021. The second movable plate 1014 is embedded in the first mold body 1020 and is slidable relative to the first mold body 1020, and the first core 1031 and the second core 1032 are arranged in the first mold body 1020 and are movable relative to the first mold body 1020, the first mold body 1020, the first core 1031, the second core 1032, the second mold assembly 105, the third core 1033 and the fourth core 1034 are used to form a cavity. The two ends of the second spring 1021 abut against the movable plate 1010 and the first mold body 1020 respectively, and the second spring 1021 is used to drive the first mold body 1020 away from the second movable plate 1014.
[0079] As shown in Figure 2 , in this way, the radial offset (for example, offset in a direction perpendicular to the Z axis) of the second movable plate 1014 during sliding can be prevented, and a radial force can be applied to the first core 1031 and the second core 1032, avoiding the bending of the first core 1031 or the second core 1032 by the second movable plate 1014, which can cause the failure of the first core 1031 or the second core 1032.
[0080] As shown in Figure 2As shown, the first mold body 1020 can be a cuboid. The first mold body 1020 can include a first cuboid hole in the middle, and the cross section of the second movable plate 1014 and the cross section of the first cuboid hole can be substantially the same in size and shape, i.e., the second movable plate 1014 can be embedded in the first cuboid hole. The second movable plate 1014 can slide up and down in the first cuboid hole (e.g., the second movable plate 1014 can slide up and down in a direction parallel to the Z axis). The top end and the bottom end of the second spring 1021 can abut against the movable plate 1010 and the first mold body 1020, respectively.
[0081] As shown, Figure 2 the number of the second spring 1021 can be 4, two of which are arranged on the left side and the remaining two are arranged on the right side. After the first core 1031 and the second core 1032 are extracted, the first movable plate 1011 is blocked by the first limiting bolt 1013 (the first limiting bolt 1013 is described in detail below with reference to Figure 5 ), at this time, the second spring 1021 can push the first mold body 1020 to move downward in a direction away from the second movable plate 1014, so as to allow the fifth core 1035 to move relative to the lower mold 10200 to complete the extraction of the fifth core 1035.
[0082] Please refer to Figure 2 and Figure 8 , the movement distance d3 (d3 is described in detail below with reference to Figure 8 ) of the first mold body 1020 relative to the second movable plate 1014 is the minimum distance required for the fifth core 1035 to complete the core extraction. That is, the fifth core 1035 can complete the core extraction after moving a distance d3 relative to the first body 10201.
[0083] Please refer to Figure 1 and Figure 2 , optionally, the first mold body 1020 includes the lower mold 10200 and the fifth core 1035, the fifth core 1035 is connected to the second movable plate 1014, the first core 1031, the second core 1032, and the fifth core 1035 are arranged in the lower mold 10200, the lower mold 10200, the first core 1031, the second core 1032, the second mold assembly 105, the third core 1033, the fourth core 1034, and the fifth core 1035 are used to form a cavity, wherein the fifth core 1035 is also used to form a undercut area of the cavity.
[0084] As shown, Figure 4As shown, the arrangement can further increase the number of cores, so that the core-pulling mechanism can pull the cores more fully, thereby improving the yield of the product 108. Since the second movable plate 1014 does not undergo radial displacement (e.g., displacement in a direction perpendicular to the Z-axis), the second movable plate 1014 does not cause the fifth core 1035 to displace when the second movable plate 1014 slides, thereby preventing the fifth core 1035 from damaging the product 108 when the fifth core 1035 is pulled out. The fifth core 1035 can be disposed inside the second core 1032.
[0085] As shown in Figure 5 , the first mold body 1020 (see Figure 2 for details of the first mold body 1020) further includes a first body 10201. The second movable plate 1014 is embedded in the first body 10201 and can slide up and down relative to the first body 10201. The lower mold 10200 is embedded in the lower end of the first body 10201 and is fixed to the first body 10201.
[0086] As shown in Figure 5 , the upper and lower ends of the second spring 1021 can abut against the movable plate 1010 and the first body 10201, respectively. The top end of the fifth core 1035 can be connected to the bottom of the second movable plate 1014 by clamping or screwing. The first core 1031, the second core 1032, and the fifth core 1035 are disposed apart from each other. The lower mold 10200, the first core 1031, the second core 1032, and the fifth core 1035 can be used to form the upper part of the cavity.
[0087] Please refer to Figure 1 and Figure 4 , optionally, the fixed mold assembly 104 includes a fixed plate assembly 106, a third movable plate 1040, and a third spring 1041. The third movable plate 1040 abuts against the fixed plate assembly 106, and the third core 1033 and the fourth core 1034 are clamped to the third movable plate 1040. One end of the third spring 1041 abuts against the third movable plate 1040, and the third spring 1041 is used to drive the third movable plate 1040 away from the second mold assembly 105. In this way, the third movable plate 1040 can drive each third core 1033 and each fourth core 1034 to move simultaneously to achieve the core-pulling of each third core 1033 and each fourth core 1034.
[0088] Please refer to Figure 1 and Figure 4The fixed plate assembly 106 can be fixed to the injection molding machine. The fixed plate assembly 106 may include an intermediate fixed plate 1060, a fixed plate body 1061, a lower movable plate 1062, and a support column 1063. The second mold assembly 105, the third movable plate 1040, the intermediate fixed plate 1061, the lower movable plate 1062, and the fixed plate body 1061 can be arranged sequentially from top to bottom. The third movable plate 1040, the intermediate fixed plate 1060, the lower movable plate 1062, and the fixed plate body 1061 can be cuboid in shape. The third movable plate 1040 can move up and down relative to the intermediate fixed plate 1060.
[0089] like Figure 4 As shown, the intermediate fixed plate 1060 can be fixed by the support column 1063, that is, the upper and lower ends of the support column 1063 are fixed to the intermediate fixed plate 1060 and the fixed plate body 1061 respectively. The bottom end of the third movable plate 1040 can abut against the top end of the intermediate fixed plate 1060.
[0090] like Figure 4 As shown, the upper and lower ends of the third spring 1041 can respectively abut against the fourth movable plate 1043 and the third movable plate 1040. The bottom ends of the third core 1033 and the fourth core 1034 can be engaged with the third movable plate 1040. For example, the diameter of the bottom end of the third core 1033 can be larger than the diameter of the rod portion of the third core 1033. The third movable plate 1040 is provided with a hole with the same diameter as the rod portion of the third core 1033 for the rod portion of the third core 1033 to pass through, thereby enabling the third core 1033 to be engaged with the third movable plate 1040.
[0091] like Figure 4 As shown, similarly, the diameter of the bottom end of the fourth core 1034 can be larger than the diameter of the rod portion of the fourth core 1034. The third movable plate 1040 is provided with a hole with the same diameter as the rod portion of the fourth core 1034 for the rod portion of the fourth core 1034 to pass through.
[0092] like Figure 4 As shown, there can be four third springs 1041, with two on the left and the remaining two on the right. The lower movable plate 1062 is connected to the ejector pin 1070. The lower movable plate 1062 can move up and down relative to the fixed plate body 1061. The ejector pin 1070 passes through the intermediate fixed plate 1060 and the second mold assembly 105 (please refer to the second mold assembly 105). Figure 1 The top surface of the lower movable plate 1062 abuts against the bottom of the fourth spring 1051. The bottom surface of the lower movable plate 1062 can abut against the upper surface of the fixed plate body 1061. When the lower movable plate 1062 moves upward, it can drive the ejector pin 1070 to push the product 108 upward. Each of the fourth springs 1051 passes through the intermediate fixed plate 1060.
[0093] Please refer to 4, Figure 6 and Figure 7 Optionally, the fixed mold assembly 104 (please refer to Figure 1 ) further comprises a second limiting bolt 1042 and a fourth movable plate 1043. The second limiting bolt 1042 is arranged through the third movable plate 1040, and the second limiting bolt 1042 is used to prevent the third movable plate 1040 from continuing to move after the third movable plate 1040 moves a predetermined distance d2. The fourth movable plate 1043 is arranged against one end of the third spring 1041 away from the third movable plate 1040, the third core 1033 and the fourth core 1034 are arranged through the fourth movable plate 1043, and the second limiting bolt 1042 is fixed to the fourth movable plate 1043.
[0094] Please refer to Figure 4 , Figure 6 and Figure 7 , in this way, after the third core 1033 and the fourth core 1034 are extracted to the position, the fourth movable plate 1043 can prevent the third movable plate 1040 from being continuously pushed downward by the third spring 1041 through the second limiting bolt 1042.
[0095] Please refer to Figure 4 , Figure 6 and Figure 7 , the head of the second limiting bolt 1042 can be arranged against the bottom surface of the third movable plate 1040 when limiting, and the rod of the second limiting bolt 1042 can pass through the third movable plate 1040. The distance from the bottom surface of the head of the second limiting bolt 1042 to the bottom surface of the fourth movable plate 1043 minus the thickness of the third movable plate 1040 is the predetermined distance d2 that the third movable plate 1040 can move.
[0096] Please refer to Figure 4 , Figure 6 and Figure 7 , after the third movable plate 1040 moves the predetermined distance d2, the third core 1033 and the fourth core 1034 can be extracted, so that the third core 1033 and the fourth core 1034 are separated from the product 108 after forming. The rod of the second limiting bolt 1042 can be screwed to the fourth movable plate 1043. The bottom surface of the fourth movable plate 1043 can be arranged against the top of the third spring 1041. The third core 1033 and the fourth core 1034 can slide up and down relative to the fourth movable plate 1043 (for example, the third core 1033 and the fourth core 1034 can slide up and down in the direction parallel to the Z axis).
[0097] Please refer to Figure 1 and Figure 2Optionally, the second mold assembly 105 includes a second mold body 1050 and a fourth spring 1051. The fourth movable plate 1043 is embedded in the second mold body 1050 and is slidable relative to the second mold body 1050. The third core 1033 and the fourth core 1034 are disposed in the second mold body 1050 and are movable relative to the second mold body 1050. The first mold assembly 102, the first core 1031, the second core 1032, the second mold body 1050, the third core 1033, and the fourth core 1034 are used to form a cavity.
[0098] Please refer to Figure 1 and Figure 2 , two ends of the fourth spring 1051 abut against the fixed plate assembly 106 and the second mold body 1050 respectively. The fourth spring 1051 is used to drive the second mold body 1050 away from the fourth movable plate 1043.
[0099] As shown in Figure 4 , in this way, the fourth movable plate 1043 can be prevented from being radially offset (e.g., offset perpendicular to the Z-axis) during sliding and exerting a radial force on the third core 1033 and the fourth core 1034, thereby avoiding the fourth movable plate 1043 bending the third core 1033 or the fourth core 1034 and causing the third core 1033 or the fourth core 1034 to fail.
[0100] As shown in Figure 2 , the second mold body 1050 can have a cuboid shape. The second mold body 1050 can include a second cuboid-shaped hole in the middle. The fourth movable plate 1043 can be embedded in the second cuboid-shaped hole and is slidable up and down relative to the second cuboid-shaped hole (e.g., up and down along a direction parallel to the Z-axis). The fourth movable plate 1043 can have a cross-sectional shape and size that are substantially the same as those of the second cuboid-shaped hole.
[0101] As shown in Figure 2 , the upper and lower ends of the fourth spring 1051 can abut against the second mold body 1050 and the lower movable plate 1062 respectively. The fourth spring 1051 can have four springs, two of which are disposed on the left side and the other two of which are disposed on the right side.
[0102] Please refer to Figure 4 , Figure 6 and Figure 8After the third core 1033 and the fourth core 1034 are extracted, the third movable plate 1040 is blocked by the second limiting bolt 1042, and at this time, the fourth spring 1051 can push the second mold body 1050 to move upward in the direction away from the fourth movable plate 1043. The moving distance d4 of the second mold body 1050 relative to the fourth movable plate 1043 is the distance that the sixth core 1036 needs to move to complete the core extraction, that is, after the sixth core 1036 moves the distance d4 relative to the second body 10501, the core extraction of the sixth core 1036 can be completed. At this time, the sixth core 1036 is moved relative to the upper mold 10500 to be out of contact with the product 108, and the core extraction of the sixth core 1036 is realized. The distance d1, the distance d2, the distance d3 and the distance d4 can be designed in advance according to actual needs.
[0103] As shown in Figure 9 , optionally, the second mold body 1050 (the second mold body 1050 is referred to Figure 2 ) includes the upper mold 10500 and the sixth core 1036, the sixth core 1036 is connected with the fourth movable plate 1043, the third core 1033, the fourth core 1034 and the sixth core 1036 are arranged in the upper mold 10500, the first mold assembly 102 (the first mold assembly 102 is referred to Figure 1 ), the first core 1031, the second core 1032, the upper mold 10500, the third core 1033, the fourth core 1034 and the sixth core 1036 are used to form a cavity, and the sixth core 1036 is further used to form an undercut area of the cavity.
[0104] As shown in Figure 9 , in this way, the number of cores can be further increased, the core extraction of the core extraction mechanism can be more sufficient, and the qualified rate of the product 108 is improved. Since the fourth movable plate 1043 does not have a radial offset (for example, an offset perpendicular to the Z axis), the fourth movable plate 1043 does not cause the sixth core 1036 to be offset when sliding, and the sixth core 1036 is prevented from damaging the product 108 when the core extraction is performed.
[0105] As shown in Figure 9 , the second mold body 1050 (the second mold body 1050 is referred to Figure 2 ) can include the second body 10501. The upper mold 10500 and the fourth movable plate 1043 can be embedded in the second body 10501. The fourth movable plate 1043 can slide up and down relative to the second body 10501. The upper mold 10500 can be fixed to the top end of the second body 10501. The upper end of the fourth spring 1051 can abut against the second body 10501.
[0106] As shown in Figure 9As shown, the bottom end of the sixth core 1036 can be fixed to the fourth movable plate 1043 by screwing or snapping. The third core 1033, the fourth core 1034, and the sixth core 1036 are arranged alternately. The upper mold 10500, the third core 1033, the fourth core 1034, and the sixth core 1036 can be used to form the lower part of the cavity.
[0107] like Figure 9 As shown, optionally, the first mold assembly 102 (please refer to the first mold assembly 102) Figure 1 This includes a fifth core 1035, which forms the undercut area of the cavity. The fifth core 1035 and the sixth core 1036 are spaced apart. This arrangement allows the fifth core 1035 and the sixth core 1036 to be pulled out from different undercut areas of the product 108 after the first core 1031, second core 1032, third core 1033, and fourth core 1034 have been pulled out first. This ensures a more even distribution of force from the fifth core 1035 and the sixth core 1036 during the pulling process, preventing damage to the product 108 due to excessive proximity between the fifth core 1035 and the sixth core 1036.
[0108] like Figure 9 As shown, the first core 1031, the second core 1032, the third core 1033, the fourth core 1034, the fifth core 1035, and the sixth core 1036 can be straight rods made of steel. The lengths of each core (i.e., the first core 1031, the second core 1032, the third core 1033, the fourth core 1034, the fifth core 1035, and the sixth core 1036) can be parallel to each other, and each core corresponds to a different undercut area of the cavity. When there are multiple cavities, in the same cavity, the first core 1031 can be located directly above the third core 1033 and the sixth core 1036. When there are multiple cavities, in the same cavity, the second core 1032 and the fifth core 1035 can be located directly above the fourth core 1034.
[0109] like Figure 9 As shown, the upper mold 10500 and the lower mold 10200 can form four cavities (i.e., one mold with four cavities), and each cavity can be used to mold one product 108. Each cavity corresponds to one first core 1031, one second core 1032, one third core 1033, one fourth core 1034, one fifth core 1035, and one sixth core 1036. That is, the number of first cores 1031, second cores 1032, third cores 1033, fourth cores 1034, fifth cores 1035, and sixth cores 1036 can each be four.
[0110] Please refer to Figure 2 and Figure 9 At the injection stage of the product 108, the first spring 1012, the second spring 1021, the third spring 1041 and the fourth spring 1051 are compressed by the clamping device of the injection molding machine and are in the compressed state. The outer diameter of the second spring 1021 is greater than the outer diameter of the first spring 1012. The outer diameter of the fourth spring 1051 is greater than the outer diameter of the second spring 1021. The outer diameter of the fourth spring 1051 is greater than the outer diameter of the third spring 1041.
[0111] As shown in Figure 9 , at the mold opening time, the first spring 1012, the second spring 1021, the third spring 1041 and the fourth spring 1051 jointly act to realize the core pulling of the first core 1031, the second core 1032, the third core 1033, the fourth core 1034, the fifth core 1035 and the sixth core 1036.
[0112] The working process of the core pulling mechanism is as follows:
[0113] Please refer to Figures 2 to 4 , after the product 108 is injected and before the mold is opened, the moving plate 1010 is connected with the clamping device of the injection molding machine, and the fixed plate body 1061 is fixed to the injection molding machine. At the mold opening time, the clamping device drives the moving plate 1010 to move upward. At this time, the first spring 1012, the second spring 1021, the third spring 1041 and the fourth spring 1051 are gradually released, the first spring 1012 can push the first movable plate 1011 to move upward, and the first movable plate 1011 drives each first core 1031 and each second core 1032 to move upward. The third spring 1041 can push the third movable plate 1040 to move downward, and the third movable plate 1040 drives each third core 1033 and each fourth core 1034 to move downward.
[0114] Please refer to Figure 2 , Figure 3 and Figure 7 When the first movable plate 1011 is blocked by the first limiting bolt 1013 (at this time, the first movable plate 1011 moves upward by a distance d1, and the moving direction of the first movable plate 1011 is shown by the linear arrow on the left side of the figure in Figure 3 ), the first movable plate 1011 no longer moves upward, and each first core 1031 is separated from each second core 1032 and the product 108 in the cavity.
[0115] Please refer to Figure 2 , Figure 3 and Figure 7When the third movable plate 1040 is blocked by the second limiting bolt 1042 (at this time, the third movable plate 1040 moves downward by a distance d2, and the direction of movement of the third movable plate 1040 is as follows...), Figure 3 (As shown by the downward linear arrow on the left side of the middle diagram), the third movable plate 1040 no longer moves downward, and the third core 1033 disengages from the fourth core 1034 and the product 108 in the cavity.
[0116] Please also refer to Figure 3 , Figure 4 and Figure 8 At this time, the second spring 1021 pushes the first mold body 1020 to move downward relative to the fifth core 1035 (at this time, the first mold body 1020 moves downward by a distance d3, and the direction of movement of the first mold body 1020 is as follows). Figure 4 (As shown by the downward linear arrow on the left), this causes the fifth core 1035 to disengage from the product 108 in the cavity.
[0117] Please also refer to Figure 3 , Figure 4 and Figure 8 The fourth spring 1051 pushes the second mold body 1050 to move upward relative to the sixth core 1036 (at this time, the second mold body 1050 moves upward by a distance d4, and the direction of movement of the second mold body 1050 is as follows). Figure 4 (As shown by the upward linear arrow on the left), this causes the sixth core 1036 to disengage from the product 108 in the cavity. That is, both the moving mold and the fixed mold have completed two core-pulling operations. After mold opening, as shown... Figure 9 As shown, after the core-pulling mechanism is opened, the product 108 can be pushed upwards using the ejector pin 1070.
[0118] The core-pulling mechanism provided in the embodiments of this application has been described in detail above. For those skilled in the art, based on the ideas of the embodiments of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be construed as a limitation of this application. All equivalent modifications or changes made in accordance with the spirit and technical concept of this application should still be covered by the claims of this application.
Claims
1. A core-drawing mechanism, characterized by, The application relates to a mold assembly. The mold assembly comprises: a movable mold assembly; a first mold assembly abutting against the movable mold assembly; a first core connected with the movable mold assembly, the first core being arranged in the first mold assembly and being movable relative to the first mold assembly; a second core connected with the movable mold assembly, the second core being arranged in the first mold assembly and being movable relative to the first mold assembly, the first core and the second core being arranged apart from each other; a fixed mold assembly; a second mold assembly abutting against the fixed mold assembly; a third core connected with the fixed mold assembly, the third core being arranged in the second mold assembly and being movable relative to the second mold assembly; a fourth core connected with the fixed mold assembly, the fourth core being arranged in the second mold assembly and being movable relative to the second mold assembly, the third core and the fourth core being arranged apart from each other, the first mold assembly, the first core, the second core, the second mold assembly, the third core and the fourth core being used for forming a cavity of a product, wherein the first core, the second core, the third core and the fourth core are also used for forming an undercut area of the cavity.
2. The core-drawing mechanism of claim 1, wherein The movable mold assembly comprises: a movable plate; a first movable plate abutting against the movable plate, the first core and the second core being clamped on the first movable plate; and a first spring having one end abutting against the first movable plate, the first spring being used for driving the first movable plate to move away from the first mold assembly.
3. A core-drawing mechanism according to claim 2, wherein The movable mold assembly further comprises: a first limiting bolt arranged in the first movable plate, the first limiting bolt being used for preventing the first movable plate from continuously moving after the first movable plate moves a predetermined distance; and a second movable plate having one end abutting against the first spring away from the first movable plate, the first core and the second core being arranged in the second movable plate, the first limiting bolt being fixed on the second movable plate.
4. A core-drawing mechanism according to claim 3, wherein The first mold assembly comprises: a first mold body, the second movable plate being embedded in the first mold body and being slidable relative to the first mold body, the first core and the second core being arranged in the first mold body and being movable relative to the first mold body, the first mold body, the first core, the second core, the second mold assembly, the third core and the fourth core being used for forming the cavity; and a second spring having two ends respectively abutting against the movable plate and the first mold body, the second spring being used for driving the first mold body to move away from the second movable plate.
5. A core-drawing mechanism according to claim 4, wherein The first mold body comprises a lower mold and a fifth core, the fifth core being connected with the second movable plate, the first core, the second core and the fifth core being arranged in the lower mold, the lower mold, the first core, the second core, the second mold assembly, the third core, the fourth core and the fifth core being used for forming the cavity, wherein the fifth core is also used for forming the undercut area of the cavity.
6. The core-drawing mechanism of claim 1, wherein The fixed mold assembly comprises: a fixed plate assembly; a third movable plate abutting against the fixed plate assembly, the third core and the fourth core being clamped to the third movable plate; and a third spring having one end abutting against the third movable plate, the third spring being configured to drive the third movable plate away from the second mold assembly.
7. A core-drawing mechanism according to claim 6, wherein The fixed mold assembly further comprises: a second limiting bolt passing through the third movable plate, the second limiting bolt being configured to stop the third movable plate from moving continuously after the third movable plate moves a predetermined distance; and a fourth movable plate having one end abutting against the other end of the third spring away from the third movable plate, the third core and the fourth core passing through the fourth movable plate, and the second limiting bolt being fixed to the fourth movable plate.
8. A core-drawing mechanism according to claim 7, wherein The second mold assembly comprises: a second mold body, the fourth movable plate being embedded in the second mold body and being slidable relative to the second mold body, the third core and the fourth core passing through the second mold body and being movable relative to the second mold body, the first mold assembly, the first core, the second core, the second mold body, the third core and the fourth core being configured to form the cavity; and a fourth spring having two ends abutting against the fixed plate assembly and the second mold body respectively, the fourth spring being configured to drive the second mold body away from the fourth movable plate.
9. A core-drawing mechanism according to claim 8, wherein The second mold body comprises an upper mold and a sixth core, the sixth core being connected to the fourth movable plate, the third core, the fourth core and the sixth core passing through the upper mold, the first mold assembly, the first core, the second core, the upper mold, the third core, the fourth core and the sixth core being configured to form the cavity, wherein the sixth core is further configured to form an undercut region of the cavity.
10. A core-drawing mechanism according to claim 9, wherein The first mold assembly comprises a fifth core, the fifth core being configured to form the undercut region of the cavity, the fifth core being spaced apart from the sixth core.