A molding die and a die-casting die having an automatic ejection function

Abstract

A molding die with automatic ejection function, comprising: a movable die, the movable die comprising a back die core; a fixed die, the fixed die comprising a front back plate, a front blank plate and a front die core, the front back plate being used for mounting on an injection molding device, the front blank plate being movable relative to the front back plate, the front die core being fixedly connected to the front blank plate, a molding cavity being formed between the front die core and the back die core, a communication channel being provided on the front die core, one end of the communication channel being communicated with the molding cavity; an ejection assembly, the ejection assembly comprising an inner ejection insert and an inner ejector pin, the inner ejection insert being fixedly connected to the front blank plate, in the process of opening the front die core and the back die core, the inner ejection insert and the inner ejector pin are in abutting fit so as to drive the inner ejector pin to move in the direction of the communication channel. The application also provides a die casting die using the above molding die. Compared with the prior art, the molding die of the application realizes the automatic ejection function of the ejection assembly by using the movement of the front blank plate relative to the front back plate, and has the advantages of simple structure, compactness and being conducive to reducing the design and manufacturing cost of the die.

Description

Technical Field

[0001] This invention relates to the field of molding die technology, and specifically to a molding die and a die-casting die with an automatic ejection function. Background Technology

[0002] A molding die is a process equipment used to shape (form) materials into products or parts with specific shapes and sizes.

[0003] After cooling within the mold, product and slag pockets form inside. When the fixed and moving molds separate, the product or slag pockets are ejected by an ejection mechanism, such as an ejector pin, to allow for the next injection molding cycle. However, existing demolding structures are complex, and the design and manufacturing costs of the molds are high. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a molding die with an automatic slag bag breaking function.

[0005] To achieve the above objectives, this invention discloses a molding die with an automatic ejection function, comprising:

[0006] The moving mold includes a rear mold core;

[0007] The fixed mold includes a front back plate, a front preform plate, and a front mold core. The front back plate is used to be mounted on an injection molding machine. The front preform plate is movable relative to the front back plate. The front mold core is fixed to the front preform plate. A cavity is formed between the front mold core and the rear mold core. A connecting channel is provided on the front mold core, and one end of the connecting channel is connected to the cavity.

[0008] The ejector assembly includes an inner ejector insert and an inner ejector pin. The inner ejector insert is fixed to the front mold plate. During the opening of the front mold core and the rear mold core, the inner ejector insert and the inner ejector pin press against each other, thereby driving the inner ejector pin to move in the direction of the connecting channel.

[0009] Preferably, the front blank plate is provided with a through groove, and the front back plate is fixedly connected with a mounting seat. The mounting seat is disposed in the through groove and has an assembly cavity. At least one side of the assembly cavity has an opening, and the length of the opening along the moving direction of the inner ejector pin is greater than the length of the inner ejector insert in that direction.

[0010] Preferably, the inner ejector pin is provided with a boss, and the boss is in a pressing fit with the inner ejector insert.

[0011] Preferably, the ejection assembly further includes a reset member, the two ends of which cooperate with the mounting base and the inner ejector pin respectively, thereby driving the inner ejector pin to move to the initial position when the preform plate moves to the initial position.

[0012] The present invention also discloses a die-casting mold that uses the above-described molding mold.

[0013] A die-casting mold includes a forming mold and a locking element as described in any of the preceding claims, the locking element being used to open the front back plate and the front blank plate before the front mold core and the rear mold core during the mold opening process;

[0014] The mounting base has a slag bag cavity at the other end relative to the assembly cavity, which communicates with the assembly cavity. The opening edge of the slag bag cavity is pressed against the front mold core.

[0015] Preferably, the slag cavity is provided with a drawing groove.

[0016] Preferably, the inner top insert is provided with a sliding hole, and the end of the inner ejector pin near the inner top insert is slidably disposed in the sliding hole.

[0017] More preferably, the sliding hole is a through hole that extends through both ends.

[0018] Preferably, the mounting base has a partition, and the partition has a guide sealing hole. The guide sealing hole connects the assembly cavity and the slag bag cavity and slides and engages with the inner ejector pin.

[0019] Preferably, the length of the inner ejector pin is equal to the distance between the bottom surface of the slag bag cavity and the end face of the front back plate near the mounting base.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: In the molding die with automatic ejection function of the present invention, during mold opening, the inner ejector insert moves synchronously with the front blank plate and presses against the inner ejector pin. Thus, the inner ejector insert drives the inner ejector pin to move towards the connecting channel, ultimately achieving automatic ejection during the mold opening process. In the above molding die opening process, the automatic ejection function of the ejection component is achieved by utilizing the movement of the front blank plate relative to the front back plate. The structure is simple and compact, which helps to reduce the design and manufacturing costs of the mold. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the die-casting mold in Example 1;

[0022] Figure 2 for Figure 1 Cross-sectional view of a die-casting mold;

[0023] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0024] Figure 4 for Figure 3 A magnified view of a portion of point B in the middle;

[0025] Figure 5This is a three-dimensional structural diagram of the mounting base;

[0026] Figure 6 A three-dimensional structural diagram of the mounting base and ejector assembly in their disassembled state;

[0027] Fixed mold 1; front back plate 11; front mold core pad 12; front blank plate 13; front mold core 14; connecting channel 141; cavity channel 1411; buffer channel 1412; annular groove 142;

[0028] Moving mold 2; back plate 21; block 22; ejection system 23; rear blank 24; rear mold core 25;

[0029] Locking component 3;

[0030] Mounting base 4; slag bag cavity 41; drawing groove 411; assembly cavity 42; sliding groove 421; mounting groove 422; partition 43; guide sealing hole 431;

[0031] Ejector assembly 5; inner ejector insert 51; sliding hole 511; inner ejector pin 52; boss 521; reset component 53. Detailed Implementation

[0032] In the description of this invention, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of the different embodiments or examples, without contradiction.

[0035] The following is in conjunction with the appendix Figure 1-6 The technical solution of the present invention will be further described below.

[0036] Example 1

[0037] A die-casting mold, see Figure 1-4The die casting equipment includes a fixed mold 1, a movable mold 2, and a locking element 3. The fixed mold 1 includes a front back plate 11, a mounting base 4, and a front mold core 14 arranged sequentially. The front back plate 11 is mounted on the die casting equipment and remains stationary during use. The mounting base 4 is detachably fixed to the front back plate 11, and a slag cavity 41 is provided at the end of the mounting base 4 away from the front back plate 11. The front mold core 14 is movable relative to the front back plate 11 and has a connecting channel 141, one end of which communicates with the slag cavity 41. The movable mold 2 includes a rear mold core 25, forming a cavity between the front mold core 14 and the rear mold core 25. The other end of the connecting channel 141 communicates with the cavity. The locking element 3 is used to open the front back plate 11 and the front mold core 14 before the front mold core 14 and the rear mold core 25 during mold opening, thereby breaking the slag cavity before the cavity opens.

[0038] In use, with the mold closed, the front mold core 14 and the rear mold core 25 form a cavity, and the slag-filled cavity 41 is connected to the cavity through the connecting channel 141. During injection, cold material, air, and molten adhesive in the cavity flow into the slag-filled cavity 41 through the connecting channel 141. This effectively alleviates the problem of insufficient material and loose material in the die-casting raw material in the cavity, and improves the strength, density, and quality of the molded product.

[0039] After cooling, a slag bag forms inside the slag bag cavity 41. Upon mold opening, under the action of the locking element 3, the front mold core 14 and the moving mold 2, as a single unit (hereinafter referred to as the "integrated structure"), first separate from the front back plate 11 (the separation distance is hereinafter referred to as the "first distance"), i.e., the slag bag cavity 41 separates from the connecting channel 141. Utilizing the adhesive force between the slag bag and the wall of the slag bag cavity 41, as well as the force generated during the separation of the integrated structure from the front back plate 11, the slag bag inside the slag bag cavity 41 is pulled apart from the product inside the connecting channel 141, thus achieving automatic separation of the slag bag and the product. By setting the mounting base 4 and utilizing the adhesive force between the slag bag and the wall of the slag bag cavity 41, and the force generated during the separation of the integrated structure from the front back plate 11 to pull apart the slag bag, the function of automatically pulling apart the slag bag is achieved. The structure is simple and compact.

[0040] After the overall structure separates from the front back plate 11 by a certain distance, the front mold core 14 separates from the moving mold 2, the cavity opens, and the product can be removed.

[0041] In this embodiment, the fixed mold 1 further includes a front blank plate 13 and a front mold core pad 12. The front blank plate 13 is movable relative to the front back plate 11. The front mold core pad 12 is fixed to the front blank plate 13, and the aforementioned front mold core 14 is fixed to the front mold core pad 12. The moving mold 2 further includes a rear back plate 21, a block 22 fixed to the rear back plate 21, an ejection system 23, and a rear blank plate 24 fixed to the block 22. The aforementioned rear mold core 25 is fixed to the rear blank plate 24. One end of the locking member 3 is connected to the front blank plate 13, and the other end is connected to the rear blank plate 24, thereby enabling the front back plate 11 and the front blank plate 13 to open before the front blank plate 13 and the rear blank plate 24. The specific structure of the aforementioned front blank plate 13, front mold core pad 12, and fixed mold 1 is a common structure in existing die-casting molds, and its specific structure will not be described in detail here.

[0042] In this embodiment, the locking element 3 is preferably an opener / closer. In actual manufacturing, the type of opener / closer can be selected according to actual needs.

[0043] In this embodiment, the end face of the mounting base 4 away from the front back plate 11 presses against the front mold core 14, thereby achieving a sealed connection between the slag cavity 41 and the connecting channel 141.

[0044] In this embodiment, see Figures 3-5 The slag bag cavity 41 is provided with a drawing groove 411, which is arranged along the axial direction of the slag bag cavity 41. This direction is consistent with the ejection direction of the ejection assembly 5, which will be described below. The drawing groove 411 in the slag bag cavity 41 increases the bonding area between the molten adhesive and the drawing groove 411, while also increasing the demolding resistance of the slag bag, further ensuring that the slag bag can be pulled apart. Furthermore, the axial direction of the drawing groove 411 ensures that it does not obstruct the movement of the slag bag when the front blank 13 and the rear blank 24 separate, allowing the ejection assembly 5 to smoothly eject the slag bag and ensuring automatic ejection of the slag bag during mold opening.

[0045] In this embodiment, see Figures 3-4 The connecting channel 141 includes a cavity channel 1411 and a buffer channel 1412 that are connected and sequentially adjacent to the slag-filled cavity 41. The end of the cavity channel 1411 away from the buffer channel 1412 is connected to the cavity. During the die casting process, the cavity channel 1411 functions the same as the cavity and is also used to form the product. The end of the buffer channel 1412 away from the cavity is connected to the slag-filled cavity 41. The above connection is not only used to connect the cavity and the slag-filled cavity 41 to avoid the problem of saturation and looseness of the product in the cavity, but also, during the separation of the preform plate 13 and the overall structure, the slag-filled cavity and the product can be broken in the buffer channel 1412, avoiding the product being broken in the cavity channel 1411 and thus scrapped.

[0046] In this embodiment, the length of the buffer channel 1412 is 10-50 mm, which ensures that the slag bag and the product can be pulled apart in the buffer channel 1412. As a further improvement, the buffer channel 1412 is shaped like a frustum of a cone, and its diameter gradually decreases in the direction from the cavity to the slag bag cavity 41. In this way, the size of the connecting structure in the buffer channel 1412 is small, making it easier to be pulled apart.

[0047] See Figure 4 An annular groove 142 is provided on the front mold core 14. The outer contour of the annular groove 142 connects with the side wall of the slag bag cavity 41. In this way, there is basically no corner structure between the slag bag cavity 41 and the front blank plate 13. When the back plate 11 separates from the overall structure, the slag bag can be smoothly separated from the front blank plate 13. In a further improvement, the buffer channel 1412 is connected to the bottom of the annular groove 142. In this way, the molten glue flows in from the bottom of the space formed by the slag bag cavity 41 and the annular groove 142. After the molten glue cools, the slag bag formed is a whole piece of slag bag. The whole piece of slag bag is easy to be ejected by the ejection component 5, avoiding the slag bag remaining in the slag bag cavity 41. In addition, when the back plate 11 separates from the overall structure, under the action of the tensile force and torque of the product on the slag bag, the slag bag and the product are more likely to break, so that the slag bag separates from the product.

[0048] In this embodiment, the front blank plate 13 is provided with a through groove, and the mounting base 4 passes through the through groove so that its end face presses against the front mold core 14, thereby sealing and communicating the slag cavity 41 with the communicating channel 141. The through groove on the front blank plate 13 not only realizes the communication between the slag cavity 41 and the communicating channel 141, but also makes the overall structure of the upper mold more compact.

[0049] In this embodiment, the mounting base 4 is provided with an ejector assembly 5, which includes an inner ejector insert 51 and an inner ejector pin 52. The inner ejector insert 51 is fixed to the front blank plate 13. After the front back plate 11 separates from the overall structure by a first distance, the front back plate 11 separates further from the overall structure. At the same time (i.e., during the process of further separation of the front back plate 11 from the overall structure), the front blank plate 13 separates from the rear blank plate 24, and the front mold core 14 and the rear mold core 25 open. During this process, the inner ejector insert 51 and the inner ejector pin 52 press against each other, thereby driving the inner ejector pin 52 to move into the slag bag cavity 41, thereby ejecting the slag bag and realizing the function of automatically ejecting the slag bag.

[0050] See Figure 3The mounting base 4 has an assembly cavity 42, and the ejector assembly 5 is installed in the assembly cavity 42, which makes the overall structure more compact. The mounting base 4 has a partition 43, and the partition 43 has a guide sealing hole 431. The guide sealing hole 431 connects the assembly cavity 42 and the slag bag cavity 41. The end of the inner ejector pin 52 near the guide sealing hole 431 is located in the hole and slides and seals with it. By setting a sealing guide hole and making the inner ejector pin 52 slide and seal with the hole, it is possible to ensure that the inner ejector pin 52 can extend into the slag bag cavity 41 to eject the slag bag, and at the same time improve the stability of the movement of the inner ejector pin 52. In addition, the sliding and sealing cooperation between the inner ejector pin 52 and the hole prevents the molten glue in the slag bag cavity 41 from leaking into the guide sealing hole 431 and the mounting cavity.

[0051] To further confine the molten adhesive within the slag cavity 41, see [link / reference]. Figures 2-3 The length of the inner ejector pin 52 is equal to the distance between the bottom surface of the slag chamber 41 and the end face of the front back plate 11 near the mounting base 4. Therefore, the end face of the inner ejector pin 52 near the slag chamber 41 is flush with the bottom of the slag chamber 41, preventing molten adhesive from flowing into the guide seal cavity and mounting cavity. Furthermore, during the adhesive injection process, because the end face of the inner ejector pin 52 near the front back plate 11 abuts against the front back plate 11, the relatively high pressure within the front back plate 11 will not cause the inner ejector pin 52 to move, thus ensuring that the inner ejector pin 52 remains flush with the bottom of the slag chamber 41 at all times during adhesive injection.

[0052] During the initial separation of the front backplate 11 from the overall structure, to ensure the slag bag can be pulled apart, it should remain adhered within the slag bag cavity 41 and not be ejected. However, during this process, the inner top insert 51 moves towards the slag bag cavity 41 along with the front blank plate 13. To prevent the inner top insert 51 from pressing against the inner ejector pin 52 during movement, which would cause the inner ejector pin 52 to eject the slag bag and prevent it from being pulled apart, see [reference needed]. Figures 3-5 The assembly cavity 42 has an opening on at least one side. In this embodiment, the assembly cavity 42 has openings on both opposite sides and on the end face near the front back plate 11. The length of the opening along the moving direction of the inner ejector pin 52 is greater than the length of the inner top insert 51 in that direction. Thus, the inner top insert 51 has a movable distance within the opening. Therefore, during the separation process of the front back plate 11 from the overall structure, the inner top insert 51 can move a first distance relative to the inner ejector pin 52 without driving the inner ejector pin 52 to move, avoiding the slag bag being ejected during the breaking of the slag bag, which would prevent the slag bag from being broken. When the inner top insert 51 moves further with the front blank plate 13, the inner top insert 51 then presses against the inner ejector pin 52 to drive the inner ejector pin 52 to move, thereby realizing the function of automatically ejecting the slag bag.

[0053] Referring to 2-3, the inner ejector pin 52 is provided with a boss 521. In the mold-closed state, the distance between the end face of the boss 521 near the front back plate 11 and the end face of the inner ejector insert 51 near the slag cavity 41 is the first distance. When the inner ejector insert 51 moves the first distance with the front blank plate 13, the inner ejector insert 51 abuts against the boss 521. When the inner ejector insert 51 moves further with the front blank plate 13, the inner ejector insert 51 presses against the boss 521, and the inner ejector pin 52 extends into the slag cavity 41, thereby ejecting the slag.

[0054] See Figure 6 The inner top insert 51 is provided with a sliding hole 511, and the inner ejector pin 52 is slidably disposed in the sliding hole 511 near the end of the inner top insert 51. In this embodiment, the sliding hole 511 is a through hole with both ends connected. When the front back plate 11 is separated from the overall structure, the end of the inner ejector pin 52 near the front back plate 11 can extend out of the sliding hole 511, so that the inner top insert 51 can slide relative to the inner ejector pin 52 without pressing against the inner ejector pin 52.

[0055] See Figure 6 The ejector assembly 5 also includes a reset member 53. In this embodiment, the reset member 53 is a spring. The two ends of the reset member 53 cooperate with the mounting base 4 and the boss 521 respectively, thereby driving the inner ejector pin 52 to move to the initial position when the front blank plate 13 moves to the initial position.

[0056] See Figures 5-6 The assembly cavity 42 includes a sliding groove 421 and a mounting groove 422 located at the bottom of the sliding groove 421. The sliding groove 421 has the aforementioned opening. The bottom of the mounting groove 422 communicates with the guide sealing hole 431. The aforementioned reset member 53 is provided in the mounting groove 422. One end of the reset member 53 abuts against the bottom of the mounting groove 422, and the other end abuts against the protrusion. When the back plate 11 is separated from the overall structure and during the mold opening process, the reset member 53 is compressed. When it returns to the mold closing state, the inner ejector pin 52 moves to the initial position under the action of the reset member 53.

[0057] In this embodiment, a guide post is provided between the fixed mold 1 and the moving mold 2, thereby improving the stability of the fixed mold 1 and the moving mold 2 during the movement process.

[0058] Example 2

[0059] When the structure of the molded product is relatively complex, the product can be demolded by combining the existing ejection mechanism (the structure of ejector pins and ejector plates) with the ejection assembly as in Example 1.

[0060] Based on this, this embodiment discloses a molding die with an automatic ejection function. The difference between this molding die and Embodiment 1 is that the ejection assembly is used to automatically eject the product during the mold opening process, thereby achieving automatic demolding. Correspondingly, to achieve product demolding, the inner ejector pin can extend into the cavity to avoid directly ejecting the product during the mold opening process.

[0061] The above-mentioned molding die with automatic ejection function realizes the automatic ejection function of the ejection component by utilizing the movement of the front blank plate relative to the front back plate. The structure is simple and compact, which helps to reduce the design and manufacturing cost of the die.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A die-casting mold, characterized in that: Including molding dies and locking components, The molding die includes: The moving mold includes a rear mold core; The fixed mold includes a front back plate, a front blank plate, and a front mold core. The front back plate is used to be installed on the die-casting equipment. The front blank plate is movable relative to the front back plate. The front mold core is fixed to the front blank plate. A cavity is formed between the front mold core and the rear mold core. A communicating channel is provided on the front mold core. One end of the communicating channel is connected to the cavity. An ejector assembly, comprising an inner ejector insert and an inner ejector pin, wherein the inner ejector insert is fixed to the front blank plate, and during the opening of the front mold core and the rear mold core, the inner ejector insert and the inner ejector pin press against each other to drive the inner ejector pin to move in the direction of the connecting channel; The front blank plate is provided with a through groove, and the front back plate is fixedly connected with a mounting seat. The mounting seat is located in the through groove and has an assembly cavity. At least one side of the assembly cavity has an opening, and the length of the opening along the moving direction of the inner ejector pin is greater than the length of the inner ejector insert in that direction. The inner ejector pin is provided with a boss, which abuts against the inner ejector insert. The mounting base has a slag bag cavity communicating with the assembly cavity at the other end relative to the assembly cavity, and the opening edge of the slag bag cavity is pressed and engaged with the front mold core. In the mold-closed state, the distance between the end face of the boss near the front back plate and the end face of the inner top insert near the slag bag cavity is equal to the first distance that the front mold core and the rear mold core move together relative to the front back plate during the mold opening process, within the first distance the slag bag is pulled off. The locking element is used to allow the front back plate and the front blank plate to open before the front mold core and the rear mold core during the mold opening process; The mounting base is provided with a partition, and the partition is provided with a guide sealing hole. The guide sealing hole connects the assembly cavity and the slag bag cavity and slides and cooperates with the inner ejector pin. The length of the inner ejector pin is equal to the distance between the bottom surface of the slag bag cavity and the end face of the front back plate near the mounting base.

2. The die-casting mold according to claim 1, characterized in that: The ejection assembly also includes a reset member, the two ends of which cooperate with the mounting base and the inner ejector pin respectively, thereby driving the inner ejector pin to move to the initial position when the preform plate moves to the initial position.

3. The die-casting mold according to claim 1, characterized in that: The slag bag cavity is provided with a drawing groove.

4. The die-casting mold according to claim 1, characterized in that: The inner top insert is provided with a sliding hole, and the end of the inner ejector pin near the inner top insert is slidably disposed in the sliding hole.

5. The die-casting mold according to claim 4, characterized in that: The sliding hole is a through hole that extends from both ends.

Images