Injection mold and punching mechanism in rear mold of injection mold
By setting up a punching mechanism on the injection mold core and using the cylinder to drive the tip rod to slide the core to pull the core, the welding wiring problem caused by the porous structure of the injection molded product is solved, and product quality and production efficiency are improved.
Patent Information
- Application Number
- CN202421607518.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-09
AI Technical Summary
During the injection molding process of plastic products, the porous or concave structure inside the product causes the welding wire to appear on the product surface, affecting the product quality.
An injection mold is designed, and a punching mechanism is provided on the core, including inserts, oil cylinders, core pulling sliders and top rods. The cylinder drives the tip rod to slide upward, driving the core pulling toward the core to achieve the core pulling punching function.
The molding of multiple holes inside the injection molded product is achieved, which improves production efficiency and avoids the occurrence of welded wires on the surface of the product, thereby improving product quality and reducing waste rate.
Smart Images
Figure CN222844656U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold and a punching mechanism in the back mold of the injection mold. Background Art
[0002] Injection molding is a method for producing industrial products. Products are usually made of rubber and plastic injection molding. The advantages of the injection molding method are fast production speed, high efficiency, automated operation, a wide variety of patterns and colors, shapes from simple to complex, sizes from large to small, and precise product size. The product is easy to update and can be made into complex-shaped parts. Injection molding is suitable for mass production and complex-shaped products and other molding processing fields.
[0003] In the injection molding of plastic products, some plastic product structures are usually provided with multiple holes or concave inside, so that weld lines will be generated on the surface of the product during molding, affecting the product quality. This requires the design of a special mechanism to solve this problem. Utility Model Content
[0004] In order to overcome the above-mentioned problems existing in the prior art, the present application provides an injection mold. The injection mold of the present application is provided with a punching mechanism on the core, including an insert and a cylinder fixed on the core, and a core-pulling slider and a push rod that can slide relative to the core, and a core-pulling slider is fixed with a core-pulling; after the product is injection molded, the push rod is driven by the cylinder to slide upward, driving the core-pulling to push up relative to the core, so as to realize the function of core-pulling punching, so that multiple holes are formed inside the injection molded product, the production efficiency is high, and no weld lines are generated on the surface of the product, thereby improving the product quality and reducing the scrap rate; in addition, the punching mechanism has few related parts and is easy to assemble, so that the overall structure of the injection mold is simplified and the manufacturing cost is low. Correspondingly, the present application also provides a punching mechanism in the back mold of the injection mold.
[0005] For the injection mold, the technical solution of this application is:
[0006] An injection mold comprises a front mold and a rear mold; the front mold comprises an upper composite plate, a hot runner plate and a cavity which are arranged in sequence; the rear mold comprises a core, a mold foot and a lower composite plate which are arranged in sequence; the core and the cavity are relatively distributed; a punching mechanism is provided on the core; the punching mechanism comprises an insert, a core-pulling slider, a push rod and a cylinder; the insert and the cylinder are fixed on the core; a group of core pulls are arranged at intervals on the core-pulling slider; the core pulls are inserted into the through holes on the insert to form a sliding pair; the push rod is arranged obliquely, with one end fixed on the core-pulling slider and the other end fixed on the connecting block; the connecting block is fixedly connected to the driving rod of the cylinder; after the product is injection molded, the cylinder is started to drive the push rod to slide upward, driving the core pull to push up relative to the core to complete the punching action.
[0007] Compared with the prior art, the injection mold of the present application is provided with a punching mechanism on the core, including an insert and a cylinder fixed on the core, and a core-pulling slider and a push rod that can slide relative to the core, and a core-pulling slider is fixed with a core-pulling core; after the product is injection molded, the push rod is driven by the cylinder to slide upward, driving the core-pulling core to push up relative to the core, thereby realizing the function of core-pulling punching, so that multiple holes are formed inside the injection molded product, the production efficiency is high, and no weld lines are generated on the product surface, thereby improving product quality and reducing scrap rate; in addition, the punching mechanism has few associated parts and is easy to assemble, so that the overall structure of the injection mold is simplified and the manufacturing cost is low.
[0008] As an optimization, in the aforementioned injection mold, a guide sleeve is installed in the hole through which the ejector pin passes on the core. The setting of the guide sleeve can, on the one hand, play a guiding role when the ejector pin slides, and support and position the ejector pin when it is reset, ensuring that the ejector pin will not deviate and ensuring the injection molding quality; on the other hand, it can also reduce the friction force when the ejector pin slides, reduce friction loss, and extend the service life of the ejector pin, and maintenance only requires replacing the guide sleeve.
[0009] As an optimization, in the aforementioned injection mold, a cylinder meson is fixed on the driving rod of the oil cylinder; the oil cylinder meson is fixed to the connecting block by snap-fit connection. In this case, the connection structure is simple, the assembly is convenient, and the connection is strong.
[0010] As an optimization, in the aforementioned injection mold, there are two push rods, which are symmetrically distributed on both sides of the cylinder drive rod. Thus, when the push rod slides upward, the force on the core-pulling slider can be made more uniform, so as to prevent the position of the core-pulling slider from shifting when sliding.
[0011] As an optimization, in the aforementioned injection mold, a limiting step is provided on the core, located on the inner side of the connecting block; the limiting step is used to limit the movement stroke of the oil cylinder drive rod. When the connecting block slides to contact the surface of the limiting step, it means that the punching action is completed; thereby, it can be avoided that the size of the hole formed inside the injection molded product is too large or too small.
[0012] For the punching mechanism, the technical solution of this application is:
[0013] The punching mechanism in the back mold of the injection mold includes an insert, a core-pulling slider, a push rod and a cylinder; the insert and the cylinder are fixed on the core; a group of core pulls are arranged at intervals on the core-pulling slider; the core pulls are inserted into the through holes on the insert to form a sliding pair; the push rod is tilted, one end of which is fixed on the core-pulling slider, and the other end is fixed on the connecting block; the connecting block is fixedly connected to the driving rod of the cylinder; after the product is injection molded, the cylinder is started to drive the push rod to slide upward, driving the core pull to push up relative to the core to complete the punching action.
[0014] Compared with the prior art, the rear in-mold punching mechanism of the injection mold of the present application includes an insert, a core-pulling slider, a push rod and a cylinder; wherein the insert and the cylinder are fixed on the core, the core-pulling slider and the push rod can slide relative to the core, and the core-pulling slider is fixed with the core-pulling slider; after the product is injection molded, the push rod is driven by the cylinder to slide upward, driving the core-pulling to push up relative to the core, thereby realizing the function of core-pulling punching, so that multiple holes are formed inside the injection molded product, the production efficiency is high, and no weld lines are generated on the product surface, thereby improving product quality and reducing scrap rate; in addition, the punching mechanism has few associated parts and is easy to assemble, and can also simplify the overall structure of the injection mold and reduce manufacturing costs.
[0015] As an optimization, in the aforementioned injection mold rear mold punching mechanism, the core pulling and the core pulling slider are detachably connected. Thus, the core pulling of the corresponding structure can be replaced according to the different types of internal holes of the injection molded product, which has good versatility and a wide range of applications.
[0016] As an optimization, in the aforementioned punching mechanism in the back mold of the injection mold, a group of guide blocks are arranged at intervals on the insert, and the core-pulling slider is sleeved on the guide blocks and can slide relative to the guide blocks. The guide blocks are arranged to play a guiding role when the core-pulling slider slides, thereby further preventing the core-pulling slider from shifting when sliding and affecting the punching effect.
[0017] Furthermore, there are two push rods, which are symmetrically distributed on both sides of the oil cylinder driving rod. Therefore, when the push rods slide upward, the force on the core-pulling slider can be made more uniform, so as to prevent the position of the core-pulling slider from shifting when sliding.
[0018] As an optimization, in the aforementioned punching mechanism in the back mold of the injection mold, a cylinder meson is fixed on the driving rod of the oil cylinder; the oil cylinder meson is fixed to the connecting block by snapping. In this case, the connection structure is simple, the assembly is convenient, and the connection is strong. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a structural schematic diagram of the injection mold of the present application;
[0020] Figure 2 yes Figure 1 An enlarged schematic diagram of the circle A in FIG.
[0021] Figure 3 It is a schematic diagram of the structure of the punching mechanism in this application;
[0022] Figure 4 It is a schematic diagram of the assembly of the insert and the core-pulling slider in this application;
[0023] Figure 5 It is a schematic diagram of the assembly of the core pulling slider and the core pulling in this application;
[0024] Figure 6 It is a structural schematic diagram of the injection mold of the present application when the mold is opened.
[0025] The markings in the attached drawings are: 1-upper plate; 2-lower plate; 3-hot runner plate; 4-cavity; 5-mold foot; 6-insert, 61-guide block; 7-core, 71-limiting step; 8-connecting block; 9-cylinder; 10-core pulling; 11-core pulling slider, 111-guide hole; 12-thrust rod; 13-guide sleeve; 14-cylinder meson. DETAILED DESCRIPTION
[0026] The present application is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present application.
[0027] Example (see Figure 1 to Figure 5 ):
[0028] The injection mold in this embodiment includes a front mold and a rear mold; the front mold includes an upper composite plate 1, a hot runner plate 3 and a cavity 4 arranged in sequence; the rear mold includes a core 7, a mold foot 5 and a lower composite plate 2 arranged in sequence; the core 7 and the cavity 4 are relatively distributed; a punching mechanism is provided on the core 7; the punching mechanism includes an insert 6, a core-pulling slider 11, a push rod 12 and a cylinder 9; the insert 6 and the cylinder 9 are fixed to the core 7 (fixed by bolt connection; the insert 6 is located inside the core 7, and the cylinder 9 is located outside the core 7); a group of core pulls 10 are arranged at intervals on the core-pulling slider 11; the core pulls 10 are inserted into the through hole on the insert 6 to form a sliding pair; the push rod 12 is arranged obliquely, one end of which is fixed on the core-pulling slider 11, and the other end is fixed on the connecting block 8 (fixed by bolts); the connecting block 8 is fixedly connected to the driving rod of the cylinder 9.
[0029] In this embodiment, a guide sleeve 13 is installed in the hole through which the ejector pin 12 passes on the core 7. The setting of the guide sleeve 13 can, on the one hand, play a guiding role when the ejector pin 12 slides, and support and position the ejector pin 12 when it is reset, ensuring that the ejector pin 12 will not deviate and ensuring the injection molding quality; on the other hand, it can also reduce the friction force when the ejector pin 12 slides, reduce friction loss, and extend the service life of the ejector pin 12, and only the guide sleeve 13 needs to be replaced during maintenance.
[0030] In this embodiment, the core pull 10 is fixed to the core pull slider 11 by bolt connection. At this time, the connection structure is simple and easy to implement, and the core pull 10 of the corresponding structure can be replaced according to the different types of internal holes of the injection molded product, which has good versatility and a wide range of applications.
[0031] In this embodiment, there are two push rods 12, which are symmetrically distributed on both sides of the driving rod of the oil cylinder 9. Therefore, when the push rod 12 slides upward, the force on the core-pulling slider 11 can be made more uniform to prevent the position of the core-pulling slider 11 from shifting when sliding.
[0032] In this embodiment, six guide blocks 61 are arranged at intervals on the insert 6, and the core-pulling slider 11 is located in the insert 6 and sleeved on the guide blocks 61 (six guide holes 111 are correspondingly arranged on the core-pulling slider 11), and can slide relative to the guide blocks 61. The guide blocks 61 are arranged to play a guiding role when the core-pulling slider 11 slides, thereby further preventing the core-pulling slider 11 from shifting when sliding and affecting the punching effect.
[0033] In this embodiment, a limiting step 71 is provided on the core 7, located inside the connecting block 8; the limiting step 71 is used to limit the movement stroke of the driving rod of the oil cylinder 9. When the connecting block 8 slides to contact the surface of the limiting step 71, it means that the punching action is completed; thereby, the hole size formed inside the injection molded product can be prevented from being too large or too small.
[0034] In this embodiment, a cylinder meson 14 is fixed on the driving rod of the oil cylinder 9; the oil cylinder meson 14 is T-shaped and is connected and fixed to the connecting block 8 by snapping. In this case, the connection structure is simple, the assembly is convenient, and the connection is strong.
[0035] After the plastic product is injection molded, the oil cylinder 9 is started, driving the push rod 12 to slide upward along the guide sleeve 13, driving the core puller 10 to push up relative to the core 7, and performing the punching action until the connecting block 8 slides to contact the limit step 71 and stops moving, completing the core puller punching action;
[0036] After the product is cooled, cavity 4 is opened upward (see Figure 6 ), the core puller 10 is driven by the oil cylinder 9 to return to its original position. The injection mold ejects the product, and when the product is completely ejected, demoulding is completed, and the product is taken away by the robot; then the injection mold reverses the above movement, resets, completes the mold closing, and starts the next injection.
[0037] The above general description of the utility model involved in this application and the description of its specific implementation method should not be understood as limiting the technical solution of the utility model. Based on the disclosure of this application, those skilled in the art can add, reduce or combine the disclosed technical features in the above general description or / and the specific implementation method (including examples) without violating the constituent elements of the utility model involved, to form other technical solutions within the scope of protection of this application.
Claims
1. An injection mold, comprising a front mold and a rear mold; the front mold comprises an upper composite plate (1), a hot runner plate (3) and a cavity (4) arranged in sequence; the rear mold comprises a core (7), a mold foot (5) and a lower composite plate (2) arranged in sequence; the core (7) and the cavity (4) are relatively distributed; characterized in that: The core (7) is provided with a punching mechanism; the punching mechanism comprises an insert (6), a core-pulling slider (11), a push rod (12) and a cylinder (9); the insert (6) and the cylinder (9) are fixed on the core (7); a group of core pulls (10) are arranged at intervals on the core-pulling slider (11); the core pulls (10) are inserted into the through holes on the insert (6) to form a sliding pair; the push rod (12) is tilted, one end of which is fixed on the core-pulling slider (11) and the other end is fixed on the connecting block (8); the connecting block (8) is fixedly connected to the driving rod of the cylinder (9); after the product is injection molded, the cylinder (9) is started to drive the push rod (12) to slide upward, driving the core pull (10) to push up relative to the core (7) to complete the punching action.
2. The injection mold according to claim 1, characterized in that: A guide sleeve (13) is installed in the hole on the core (7) through which the ejector rod (12) passes.
3. The injection mold according to claim 1, characterized in that: A cylinder meson (14) is fixed on the driving rod of the oil cylinder (9); the oil cylinder meson (14) is fixed to the connecting block (8) by means of a snap connection.
4. The injection mold according to claim 1, characterized in that: There are two push rods (12) which are symmetrically distributed on both sides of the driving rod of the oil cylinder (9).
5. The injection mold according to claim 1, characterized in that: A limiting step (71) is provided on the core (7) and located on the inner side of the connecting block (8); the limiting step (71) is used to limit the moving stroke of the driving rod of the oil cylinder (9).
6. The punching mechanism in the back mold of the injection mold is characterized by: The invention comprises an insert (6), a core-pulling slider (11), a push rod (12) and an oil cylinder (9); the insert (6) and the oil cylinder (9) are fixed on the core (7); a group of core pulls (10) are arranged at intervals on the core-pulling slider (11); the core pulls (10) are inserted into the through holes on the insert (6) to form a sliding pair; the push rod (12) is arranged obliquely, one end of which is fixed on the core-pulling slider (11) and the other end is fixed on the connecting block (8); the connecting block (8) is fixedly connected to the driving rod of the oil cylinder (9); after the product is injection molded, the oil cylinder (9) is started to drive the push rod (12) to slide upward, thereby driving the core pull (10) to push up relative to the core (7) to complete the punching action.
7. The back-mold punching mechanism of the injection mold according to claim 6, characterized in that: The core pulling device (10) is detachably connected to the core pulling slider (11).
8. The back punching mechanism of the injection mold according to claim 7, characterized in that: A group of guide blocks (61) are arranged at intervals on the insert (6), and the core-pulling slider (11) is sleeved on the guide block (61) and can slide relative to the guide block (61).
9. The back-mold punching mechanism of the injection mold according to claim 6, characterized in that: There are two push rods (12) which are symmetrically distributed on both sides of the driving rod of the oil cylinder (9).
10. The back-mold punching mechanism of the injection mold according to claim 6, characterized in that: A cylinder meson (14) is fixed on the driving rod of the oil cylinder (9); the oil cylinder meson (14) is fixed to the connecting block (8) by means of a snap connection.