Injection mold

Abstract

The utility model relates to the technical field of mold manufacturing, in particular to an injection mold which comprises a front mold set and a rear mold set, a positioning rod and a pressing block are additionally arranged on the rear mold set, the pressing block is installed on a bottom plate in a fastening mode, the positioning rod is installed on the positioning rod in a fastening mode, and a spring is sleeved on the positioning rod in a pre-compression mode and abuts against a movable mold plate. Under the condition that the ejection strokes are the same, the height of the square iron can be properly reduced, and the mold base cost is saved; after the height of the square iron is reduced, the lengths of the pitched roof, the ejector pin, the supporting head and the like can be reduced, and the material cost is saved; meanwhile, the height of the square iron is reduced, the size of the mold is reduced, and the requirement for the mold containing thickness is reduced, so that the mold can be matched with an injection molding machine with a smaller specification, the specification of the injection molding machine does not need to be increased, the injection molding cost is reduced, and economic benefits are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mold manufacturing, in particular to an injection mold. Background Art

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. Its advantages include high production speed, high efficiency, automated operation, a wide variety of designs and colors, shapes ranging from simple to complex, and sizes ranging from large to small. Furthermore, it produces precise product dimensions, is easily updated, and can produce complex shapes. Injection molding is suitable for mass production and the molding of complex products.

[0003] The key component of injection molding is the injection mold, which is usually composed of a front mold part and a back mold part. When the front and back mold parts are combined, a product cavity is formed. Liquid plastic is injected into the cavity and hardened. After the mold is opened and demolded, the corresponding product is obtained. In the existing technology, the back mold part generally includes a return pin and a spring. The return pin is mounted on the ejector plate, and the spring is pre-compressed and fitted on the return pin. When designing the injection mold, the assembly structure of the return pin and the spring is limited. If the ejection stroke is required to be increased, a longer return pin and spring are usually required. The square iron, inclined ejector, and support head all need to be increased, and the specifications of the injection molding machine must also be increased accordingly. The corresponding mold base and equipment costs are greatly increased, and the economic benefits are low.

[0004] Therefore, in order to solve the above technical problems, the present invention provides an injection mold with a new structure. When the ejection stroke is the same, there is no need to increase the specifications of the injection molding machine, so as to solve the problem of low economic efficiency of existing injection molds. Utility Model Content

[0005] In view of the above problems existing in the prior art, the present invention provides an injection mold, comprising:

[0006] A front mold assembly, comprising a panel, a fixed mold plate, and a front mold core, wherein the fixed mold plate is installed below the panel, the fixed mold plate is provided with a first accommodating cavity, the front mold core is accommodated in the first accommodating cavity, the panel is provided with an injection nozzle penetrating the fixed mold plate and the front mold core, the front mold core is formed with a groove, and the fixed mold plate is provided with a column sleeve;

[0007] A rear mold assembly, comprising a core, a rear mold core, a movable mold plate, a square iron, a guide column, a positioning rod, a spring, a pressure block, a return pin, an ejector pin, an ejector pin panel, an ejector pin bottom plate, and a bottom plate;

[0008] The movable platen is provided with a second accommodating cavity, the rear mold core is accommodated in the second accommodating cavity, the core is fastened to the rear mold core and faces the groove, the guide post is fastened to the movable platen and slidably engaged with the post sleeve, the ejector panel and the ejector base plate are fastened to clamp the ejector, and the ejector can slidably pass through the movable platen and the rear mold core;

[0009] The pressure block is fastened to the bottom plate, one end of the positioning rod passes through the ejector panel and the ejector bottom plate and is fastened to the pressure block, the other end of the positioning rod is fastened to the movable plate, and the spring is pre-compressed and sleeved on the positioning rod;

[0010] One end of the return pin is fixedly clamped on the ejector panel and the ejector bottom plate, and the other end of the return pin faces the movable plate, and the return pin can slide through the movable plate;

[0011] The square iron is fixedly installed between the movable template and the bottom plate.

[0012] Optionally, the base plate is provided with a first mounting groove, the first mounting groove is used to install the pressing block, and the pressing block is accommodated in the first mounting groove.

[0013] Optionally, the rear module further includes a limiting column, which is fastened to the ejector panel.

[0014] Optionally, the ejector pin includes a first ejector pin and a second ejector pin, the first ejector pin is slidably passed through the core, and the top end of the first ejector pin is flush with the top surface of the core;

[0015] The second ejector pin is arranged along the edge of the core, and the top end of the second ejector pin extends into the front mold core.

[0016] Optionally, a positioning ring is provided on the top of the panel, an opening of the positioning ring is installed facing the injection nozzle, and the positioning ring is connected to the injection nozzle.

[0017] Optionally, the pressing block is provided with a spring seat, and the spring is installed on the spring seat.

[0018] Optionally, after the front mold assembly and the rear mold are assembled, a cavity is formed on the front mold core and the rear mold core, and the injection nozzle is connected to the cavity.

[0019] Optionally, after the front module and the rear module are opened, the ejector base plate pushes the ejector to perform demoulding.

[0020] Optionally, the ejector further includes a third ejector, one end of the third ejector is clamped between the ejector panel and the ejector base plate, the other end of the third ejector faces the movable template, the third ejector can slide through the movable template and the rear mold core, and the upper end of the third ejector faces the injection nozzle.

[0021] Optionally, the bottom plate is provided with a demoulding hole, which passes through the bottom plate and faces the ejector bottom plate.

[0022] The technical solution of the utility model has the following advantages or beneficial effects:

[0023] The injection mold provided by the utility model includes a front module and a rear module. A positioning rod and a pressure block are additionally provided on the rear module. The pressure block is tightly mounted on the bottom plate, the positioning rod is tightly mounted on the positioning rod, and a spring is pre-compressed and sleeved on the positioning rod and abuts against the movable template. Under the condition of the same ejection stroke, the height of the square iron can be appropriately reduced, saving the cost of the mold base; and after reducing the height of the square iron, the length of the inclined ejector, ejector pin, support head, etc. can also be reduced, saving material cost; at the same time, by reducing the height of the square iron, the size of the mold becomes smaller, and the mold thickness requirement is reduced, so that smaller injection molding machines can also be adapted, that is, there is no need to increase the specifications of the injection molding machine, thereby reducing the injection molding cost and improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The embodiments of the present invention will be described more fully with reference to the accompanying drawings, which are for illustration and description only and are not intended to limit the scope of the present invention.

[0025] Figure 1 A schematic cross-sectional view of an injection mold of an existing structure;

[0026] Figure 2 This is a three-dimensional schematic diagram of the injection mold of the present invention;

[0027] Figure 3 Schematic cross-sectional view of the injection mold of the present invention;

[0028] Figure 4 This is an exploded schematic diagram of the front module of the present invention;

[0029] Figure 5 It is a three-dimensional schematic diagram of the rear module of the present invention;

[0030] Figure 6 This is an exploded schematic diagram of the rear module of the present invention;

[0031] Illustration:

[0032] 1. Locating ring; 2. Panel; 3. Fixed platen; 4. Front mold core; 5. Rear mold core; 6. Moving platen; 7. Square iron; 8. Return pin; 9. Spring; 10. Ejector panel; 11. Ejector base plate; 12. Base plate;

[0033] 13. First accommodating cavity; 14. Injection nozzle; 15. Groove; 16. Core; 17. Cavity; 18. Injection runner; 19. Pillar sleeve; 20. Guide pillar; 21. Positioning rod; 22. Press block; 23. Ejector pin;

[0034] 24. Second accommodating cavity; 25. First mounting groove; 26. Limiting column; 27. First ejector pin; 28. Second ejector pin; 29. ​​Third ejector pin; 30. Demolding hole; 31. Spring seat. DETAILED DESCRIPTION

[0035] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many other forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0037] In the description of this utility model, unless otherwise defined, all technical and scientific terms used in this utility model have the same meaning as commonly understood by those skilled in the art to which this utility model belongs. The terms used in this specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items.

[0038] In the description of this utility model, technical terms such as "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly indicate the number, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0039] Figure 1 A schematic cross-sectional view of an injection mold of conventional structure is shown in FIG. Figure 1As shown, a conventional injection mold generally includes a positioning ring 1, a panel 2, a fixed platen 3, a front mold core 4, a rear mold core 5, a movable platen 6, a square iron 7, a return pin 8, a spring 9, an ejector platen 10, an ejector base plate 11, and a base plate 12. One end of the return pin 8 is fixedly mounted on the ejector platen 10, and the other end extends toward and is slidably connected to the movable platen 6. The spring 9 is pre-compressed and fits over the return pin 8. The bottom of the spring 9 abuts the upper surface of the ejector platen 10, and the upper portion of the spring 9 extends into the interior of the movable platen 6.

[0040] like Figure 2-6 As shown, the injection mold of the present invention includes a front mold group and a rear mold group. Specifically, the front mold group includes a panel 2, a fixed mold plate 3 and a front mold core 4, all of which are made of steel. The fixed mold plate 3 is fastened to the lower surface of the panel 2. The lower surface of the fixed mold plate 3 is provided with a first accommodating cavity 13. The lower surface of the first accommodating cavity 13 is open. The shape of each accommodating cavity is adapted to the shape of the front mold core 4. The front mold core 4 is accommodated in the first accommodating cavity 13 and fastened. An injection nozzle 14 for injecting liquid plastic is provided at the center of the panel 2. The injection nozzle 14 passes through the fixed mold plate 3 and the front mold core 4. Two symmetrical grooves 15 are formed on the lower surface of the front mold core 4. The inner surface shape of the groove 15 is adapted to the outer surface shape of the product. The groove 15 is used to respectively accommodate cores 16 to form two product cavities 17. An injection channel 18 is formed on the front mold core 4, where it connects to the injection nozzle 14. This channel 18 communicates with both cavities 17. Liquid plastic flows from the injection nozzle 14 through the channel 18 into the cavities 17 for injection molding, resulting in two products in a single injection molding operation. Multiple column sleeves 19 are evenly arranged near the edge of the lower surface of the fixed mold plate 3. These column sleeves 19 are used to slidably connect to the rear mold assembly and provide a certain degree of guidance.

[0041] Furthermore, in this embodiment, the rear mold assembly includes a core 16, a rear mold core 5, a movable mold plate 6, a square iron 7, a guide column 20, a positioning rod 21, a spring 9, a pressure block 22, a return pin 8, an ejector pin 23, an ejector panel 10, an ejector base plate 11 and a base plate 12, all of which are made of steel. A second accommodating cavity 24 is provided on the upper surface of the movable mold plate 6. The upper surface of the second accommodating cavity 24 is open. The shape of the second accommodating cavity 24 is adapted to the shape of the rear mold core 5. The rear mold core 5 is accommodated in the second accommodating cavity 24 and is securely installed. The two cores 16 are respectively and correspondingly secured to the rear mold core 5 and face the groove 15. The outer surface shape of the core 16 is adapted to the inner surface shape of the product. When the front mold assembly and the rear mold are assembled, the core 16 extends into the groove 15 to form a cavity 17. The cavity 17 is connected to the injection runner 18 and the injection nozzle 14. The upper surface of the movable platen 6 is provided with a plurality of guide posts 20 corresponding to the column sleeves 19. The guide posts 20 are fixedly mounted on the movable platen 6 and slidably connected to the column sleeves 19. The guide posts 20 allow the rear mold assembly to slide away from the front mold assembly without disengaging when the mold is opened, and can be smoothly closed under the guidance of the column sleeves 19 when the rear mold is assembled. Two square irons 7 are symmetrically fixedly mounted between the movable platen 6 and the bottom plate 12 and are located on both sides of the bottom plate 12. The ejector panel 10 and the ejector bottom plate 11 are movably arranged between the movable platen 6 and the bottom plate 12 and are located in the middle of the bottom plate 12. The ejector panel 10 and the ejector bottom plate 11 are fixedly clamped with one end of the ejector 23, and the other end of the ejector 23 can slide through the movable platen 6 and the rear mold core 5. There are several ejector pins 23, which are used to eject the product when the mold is opened to complete the demolding of the product.

[0042] Furthermore, in this embodiment, two pressure blocks 22 are securely mounted on the upper surface of the base plate 12. The lower ends of two positioning rods 21 pass through the ejector panel 10 and the ejector base plate 11 and are securely connected to the corresponding pressure blocks 22. The upper ends of the positioning rods 21 extend toward and securely connect to the movable platen 6. Two springs 9 are pre-compressed and fitted onto the two positioning rods 21. The lower ends of the springs 9 pass through the ejector panel 10 and the ejector base plate 11 and are relatively independent. The upper ends of the springs 9 extend into the interior of the movable platen 6 or abut the lower surface of the movable platen 6. One end of a return pin 8 is securely clamped to the ejector panel 10 and the ejector base plate 11, while the other end faces the movable platen 6. The return pin 8 slidably passes through the movable platen 6. In the closed mold state, the upper end surface of the return pin 8 does not extend beyond the upper surface of the movable platen 6. There are at least two return pins 8, symmetrically arranged, and they serve to guide the movement of the ejector panel 10 and the ejector base plate 11 between the movable platen 6 and the base plate 12 and provide support.

[0043] Furthermore, in this embodiment, to effectively reduce the thickness of the injection mold, a first mounting groove 25 is provided on the upper surface of the base plate 12. The first mounting groove 25 is recessed toward the bottom surface of the base plate 12 and is used to mount the pressure block 22. The pressure block 22 is accommodated in the first mounting groove 25 and securely mounted. The pressure block 22 is provided with a spring seat 31. The spring seat 31 is recessed toward the bottom surface of the pressure block 22 from the upper surface. The lower end of the spring 9 is mounted on the spring seat 31. In this way, while maintaining the same ejection stroke, the thickness of the mold can be appropriately reduced. Specifically, the height of the square iron 7, return pin 8, ejector pin 23, inclined ejector, and support head can be reduced, thereby saving the manufacturing material cost of the mold.

[0044] Furthermore, in this embodiment, in order to prevent the ejector panel 10 from being over-ejected when the mold is opened, the rear mold assembly is also provided with a limit column 26. Specifically, the limit column 26 is fastened to the upper surface of the ejector panel 10, and the limit column 26 protrudes toward the movable mold plate 6. The height of the limit column 26 can be appropriately designed according to the total length of the spring 9 after compression to ensure sufficient ejection stroke.

[0045] Furthermore, in this embodiment, ejector pins 23 include a first ejector pin 27 and a second ejector pin 28. First ejector pins 27 are slidably disposed through core 16 and are evenly distributed on core 16, with their tops flush with the top surface of core 16. Second ejector pins 28 are evenly distributed along the edge of core 16, with their tops extending into and abutting against front mold core 4. Ejector pins 23 also include a third ejector pin 29. One end of third ejector pin 29 is clamped between ejector plate 10 and ejector base plate 11, with the other end facing toward movable mold plate 6. Third ejector pin 29 slidably penetrates movable mold plate 6 and rear mold core 5, with its top facing injection nozzle 14. First ejector pins 27 and second ejector pins 28 are used for product demolding, while third ejector pin 29 is used to remove molding residue from injection nozzle 14 and injection runner 18.

[0046] Furthermore, in this embodiment, a positioning ring 1 is provided on the top of the panel 2. The opening of the positioning ring 1 is installed facing the injection nozzle 14. The positioning ring 1 is connected to the injection nozzle 14 and is used to connect to the injection molding machine for injection molding operations.

[0047] Furthermore, in this embodiment, a demolding hole 30 is provided at the midpoint of the base plate 12. The demolding hole 30 passes through the base plate 12 and faces the ejector base plate 11. After the front mold group and the rear mold group are opened, the ejector rod on the injection molding machine acts on the ejector base plate 11 and pushes the ejector 23 to demold, thereby completing the product demolding.

[0048] In order to better illustrate the injection mold of the present invention, a detailed description is now given of the mold design with an ejection stroke of 80mm. Specifically, the maximum external dimensions of the mold are designed according to the specifications of the injection molding machine. For example, taking the Haitian 120T injection molding machine as an example, the tie rod spacing is 410*410mm, and the maximum thickness of the mold is 430mm; then the length and width dimensions of the mold design must not exceed 410*410mm to be assembled, and the maximum thickness of the mold design must not exceed 430mm to be assembled. For another example, taking the Haitian 160T injection molding machine as an example, the tie rod spacing is 455*455mm, and the maximum thickness of the mold is 500mm; then the length and width dimensions of the mold design must not exceed 455*455mm to be assembled, and the maximum thickness of the mold design must not exceed 500mm to be assembled.

[0049] Furthermore, a mold with an ejection stroke L of 80mm is designed. When the mold structure is designed using conventional technology, the length and width of the mold are designed to be 300*250mm, and the thickness D1 of the mold is designed to be 441mm. The length and width of the mold can both be adapted to Haitian 120T and 160T injection molding machines, but because 500mm>441mm>430mm, the mold thickness can only be adapted to Haitian 160T injection molding machines, and cannot be assembled on Haitian 120T injection molding machines. When the mold structure of the present invention is used to design a mold, the length and width dimensions of the mold design are also 300*250mm, and the mold design thickness D2 is 421mm; the length and width dimensions of the mold can both adapt to Haitian 120T and 160T injection molding machines, and 500mm>430mm>421mm, so the mold thickness can also adapt to Haitian 120T and 160T injection molding machines. Then, during production, Haitian 120T injection molding machines can be selected. The injection mold with the new structure actively reduces the compatible injection molding machine by one specification, greatly reducing the equipment cost, thereby reducing the injection molding cost and improving the economic benefit.

[0050] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. Injection mold, characterized in that, include: A front mold assembly, comprising a panel, a fixed mold plate, and a front mold core, wherein the fixed mold plate is installed below the panel, the fixed mold plate is provided with a first accommodating cavity, the front mold core is accommodated in the first accommodating cavity, the panel is provided with an injection nozzle penetrating the fixed mold plate and the front mold core, the front mold core is formed with a groove, and the fixed mold plate is provided with a column sleeve; A rear mold assembly, comprising a core, a rear mold core, a movable mold plate, a square iron, a guide column, a positioning rod, a spring, a pressure block, a return pin, an ejector pin, an ejector pin panel, an ejector pin bottom plate, and a bottom plate; The movable platen is provided with a second accommodating cavity, the rear mold core is accommodated in the second accommodating cavity, the core is fastened to the rear mold core and faces the groove, the guide post is fastened to the movable platen and slidably engaged with the post sleeve, the ejector panel and the ejector base plate are fastened to clamp the ejector, and the ejector can slidably pass through the movable platen and the rear mold core; The pressure block is fastened to the bottom plate, one end of the positioning rod passes through the ejector panel and the ejector bottom plate and is fastened to the pressure block, the other end of the positioning rod is fastened to the movable plate, and the spring is pre-compressed and sleeved on the positioning rod; One end of the return pin is fixedly clamped on the ejector panel and the ejector bottom plate, and the other end of the return pin faces the movable plate, and the return pin can slide through the movable plate; The square iron is fixedly installed between the movable template and the bottom plate.

2. The injection mold according to claim 1, wherein The bottom plate is provided with a first mounting groove, and the first mounting groove is used for mounting the pressing block, and the pressing block is accommodated in the first mounting groove.

3. The injection mold according to claim 2, wherein: The rear module further includes a limiting column, which is fastened to the ejector panel.

4. The injection mold according to claim 3, wherein: The ejector pin includes a first ejector pin and a second ejector pin, wherein the first ejector pin is slidably passed through the core, and the top end of the first ejector pin is flush with the top surface of the core; The second ejector pin is arranged along the edge of the core, and the top end of the second ejector pin extends into the front mold core.

5. The injection mold according to claim 1, wherein A positioning ring is provided on the panel, an opening of the positioning ring is installed facing the injection nozzle, and the positioning ring is connected to the injection nozzle.

6. The injection mold according to claim 2, wherein: The pressing block is provided with a spring seat, and the spring is installed on the spring seat.

7. The injection mold according to claim 1, wherein: After the front mold assembly and the rear mold are assembled, a cavity is formed on the front mold core and the rear mold core, and the injection nozzle is connected to the cavity.

8. The injection mold according to claim 7, wherein: After the front mold and the rear mold are opened, the ejector base pushes the ejector to perform demoulding.

9. The injection mold according to claim 4, wherein: The ejector further includes a third ejector, one end of which is clamped between the ejector panel and the ejector bottom plate, and the other end of which faces the movable mold plate. The third ejector can slide through the movable mold plate and the rear mold core, and the upper end of the third ejector faces the injection nozzle.

10. The injection mold according to claim 1, wherein: The bottom plate is provided with a demoulding hole, which passes through the bottom plate and faces the ejector bottom plate.

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