Injection mold with side edge limiting function

Abstract

The utility model discloses a side limit injection mold in the field of injection molds, which comprises an upper mold and a lower mold, the upper mold comprises an upper top plate and an upper bottom plate, the upper top plate and the upper bottom plate are connected through screws, and the lower mold comprises a lower bottom plate, a mold core plate and a limit plate. The lower bottom plate and the limiting plate are connected through screws, the mold core plate and the limiting plate are connected through screws, an upper mold box is arranged at one end of the upper bottom plate, and a lower mold box is arranged at one end of the mold core plate; according to the side edge limiting injection mold disclosed by the utility model, the positioning plate arranged on the surface of the mold core plate and the positioning blocks at the two ends of the positioning plate are stably connected with the mold core plate through long screws, so that the accurate positioning of the lower mold box in the mold closing process is ensured, and the limiting blocks on the positioning plate are used for further laterally limiting the lower mold box; and mold deviation caused by pressure in the injection molding process is effectively prevented, and the injection molding precision and stability are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold field, concretely is a kind of injection mold of side edge limiting. BACKGROUND

[0002] Injection mold is a tool for injection molding process, it can be injected into the mold cavity by the high temperature and high pressure of injection molding machine, and the plastic product of required shape and size is obtained after cooling and setting. Simply speaking, injection mold is like the "forming cradle" of plastic product, determines the final appearance, structure and performance of plastic product. The precision and quality of injection mold directly affect the dimensional accuracy, appearance quality and physical properties of plastic product. High-precision mold can produce quality-stable plastic products that meet design requirements. By designing and manufacturing injection molds of different shapes, structures and functions, the diversification and innovation of plastic products can be realized to meet the needs of different users.

[0003] The existing injection mold still has the following defects: first, the traditional mold relies on simple guide pillar guide sleeve to realize the alignment of upper and lower molds, but when high-pressure injection (usually the pressure reaches tens to hundreds of megapascals), the mold assembly bears a huge impact force. When the strength is insufficient or the connection stability is poor (such as loose screw fixation), the mold cavity between the mold plate and the mold cavity is connected only by ordinary screws, lacks lateral constraint, and the screw may loosen under high pressure, which easily causes the mold cavity and other key components on the mold plate to move slightly. The misalignment of the mold cavity can easily lead to uneven plastic filling, product wall thickness deviation or flash. Most molds rely only on vertical positioning, lacking lateral limiting structure. During the injection molding process, the lateral impact force generated by the high-speed injection of molten plastic into the cavity (especially for asymmetric structure products) can push the mold cavity on the mold plate to slide laterally. Secondly, the misalignment of the mold cavity, mold plate and other key components can cause the upper and lower molds to fail to align completely during mold closing. The mold cavity has an initial misalignment, and the initial misalignment is superimposed with the dynamic deviation during the injection molding process, which significantly reduces the product consistency. Under frequent high-pressure impact, the closed surface is prone to gap, leading to periodic size fluctuations in the product, which reduces the yield during batch production and easily reduces the precision of the injection-molded product. UTILITY MODEL CONTENTS

[0004] In order to overcome the deficiencies of the prior art, the utility model provides an injection mold with side edge limiting, which can effectively solve the technical problems of low injection precision of the existing injection mold and easy misalignment of the mold cavity during the injection molding process.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a side-limiting injection mold, including an upper mold and a lower mold. The upper mold includes an upper top plate and an upper bottom plate, which are connected by screws. The lower mold includes a lower bottom plate, a mold core plate, and a limiting plate, which are connected by screws. The mold core plate and the limiting plate are also connected by screws. An upper mold box is provided at one end of the upper bottom plate, and a lower mold box is provided at one end of the mold core plate. The interiors of the upper mold box and the lower mold box are hollow structures. The upper mold box and the lower mold box together form a mold cavity. Two positioning plates are provided on the surface of the mold core plate. Positioning blocks are provided at both ends of the positioning plates. Long screws are provided on the surface of the positioning blocks. The positioning blocks are connected to the mold core plate through the long screws. Limiting blocks for limiting the lower mold box are provided on the surface of the positioning plates. Several fixing plates are provided on the surface of the positioning plates through screws. Adjacent fixing plates are evenly distributed. A locking block is provided at one end of the fixing plate. The side of the locking block is connected to the surface of the lower mold box.

[0006] Furthermore, the surface of the lower base plate is provided with two push plates, each push plate is provided with several vertical push rods, the interior of the lower mold box is provided with several guide holes, one end of each push rod passes through the mold core plate and extends into the interior of the lower mold box, and the top of each push rod passes through the guide hole to achieve ejection.

[0007] Furthermore, an injection tube is provided on the surface of the upper top plate, and one end of the injection tube extends into the interior of the upper mold box.

[0008] Furthermore, the mold core plate is provided with a plurality of conductive metal tubes inside, one end of each metal tube extending to the outside of the mold core plate and having a liquid inlet at one end. The mold core plate is also provided with a horizontally placed heat-conducting pipe inside, one end of each metal tube communicating with the heat-conducting pipe and both ends of the heat-conducting pipe extending to the outside of the mold core plate.

[0009] Furthermore, the upper base plate is provided with several conductive connecting pipes inside, one end of each connecting pipe extends to the outside of the upper base plate, and one end of each connecting pipe is provided with an inlet. The upper base plate is provided with a horizontally placed fixing pipe inside, one end of each connecting pipe is connected to the fixing pipe, and both ends of the fixing pipe extend to the outside of the upper base plate.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: The side-limiting injection mold of this utility model has a positioning plate and positioning blocks at both ends of the positioning plate on the surface of the mold core plate. The positioning plate is firmly connected to the mold core plate by long screws, which ensures the accurate positioning of the lower mold box during the mold closing process. The limiting blocks on the positioning plate further limit the lower mold box laterally, effectively preventing the mold cavity from shifting due to pressure during the injection process, and improving the accuracy and stability of injection molding. Attached Figure Description

[0011] Fig. 1 This is a perspective view of an injection mold with side limiting according to the present invention;

[0012] Fig. 2 This is a schematic diagram of the internal structure of an injection mold with side limiting according to this utility model;

[0013] Fig. 3 This is a schematic diagram of the lower mold box of an injection mold with side limiting according to this utility model.

[0014] Numbering on the map:

[0015] 1-Top plate; 2-Top base plate; 3-Lower base plate; 4-Limiting plate; 5-Mold core plate; 6-Injection tube; 7-Inlet; 8-Fixing tube; 9-Liquid inlet; 10-Heat pipe; 11-Limiting block; 12-Push plate; 13-Push rod; 14-Upper mold box; 15-Lower mold box; 16-Mold cavity; 17-Positioning block; 18-Connecting tube; 19-Long screw; 20-Positioning plate; 21-Metal tube; 22-Fixing plate; 23-Clamping block; 24-Guide hole. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] The following is combined with Figs. 1-3 A detailed description of a side-limiting injection mold according to this utility model is provided:

[0018] A side-limiting injection mold includes an upper mold and a lower mold. The upper mold includes an upper top plate 1 and an upper bottom plate 2, which are connected by screws. The lower mold includes a lower bottom plate 3, a mold core plate 5, and a limiting plate 4, which are connected by screws. The mold core plate 5 and the limiting plate 4 are also connected by screws. An upper mold box 14 is provided at one end of the upper bottom plate 2, and a lower mold box 15 is provided at one end of the mold core plate 5. The upper mold box 14 and the lower mold box 15 have hollow interiors and together form a mold cavity. 16. Two positioning plates 20 are provided on the surface of the mold core plate 5. Positioning blocks 17 are provided at both ends of the positioning plates 20. Long screws 19 are provided on the surface of the positioning blocks 17. The positioning blocks 17 are connected to the mold core plate 5 through the long screws 19. Limiting blocks 11 for limiting the lower mold box 15 are provided on the surface of the positioning plates 20. Several fixing plates 22 are provided on the surface of the positioning plates 20 through screws. Adjacent fixing plates 22 are evenly distributed. A locking block 23 is provided at one end of the fixing plate 22. The side of the locking block 23 is connected to the surface of the lower mold box 15.

[0019] The surface of the lower base plate 3 is provided with two push plates 12, and the push plates 12 are provided with several vertical push rods 13. The interior of the lower mold box 15 is provided with several guide holes 24. One end of the push rod 13 passes through the mold core plate 5 and extends into the interior of the lower mold box 15. The top of the push rod 13 passes through the guide hole 24 to achieve ejection. The surface of the upper top plate 1 is provided with an injection tube 6, and one end of the injection tube 6 extends into the interior of the upper mold box 14.

[0020] The mold core plate 5 has several conductive metal tubes 21 inside, one end of each metal tube 21 extending to the outside of the mold core plate 5, and one end of each metal tube 21 having a liquid inlet 9. The mold core plate 5 also has a horizontally placed heat-conducting pipe 10 inside, one end of each metal tube 21 communicating with the heat-conducting pipe 10, and both ends of the heat-conducting pipe 10 extending to the outside of the mold core plate 5. The upper base plate 2 has several conductive connecting pipes 18 inside, one end of each connecting pipe 18 extending to the outside of the upper base plate 2, and one end of each connecting pipe 18 having an inlet 7. The upper base plate 2 also has a horizontally placed fixing pipe 8 inside, one end of each connecting pipe 18 communicating with the fixing pipe 8, and both ends of the fixing pipe 8 extending to the outside of the upper base plate 2.

[0021] In this embodiment, an injection tube 6 is provided on the surface of the upper top plate 1, extending into the interior of the upper mold box 14. A sealing ring is used to seal the injection tube 6 and the upper top plate 1 to prevent leakage of molten plastic during injection molding. The inner walls of the upper mold box 14 and the lower mold box 15 are machined with high precision to ensure the surface smoothness of the mold cavity 16 and reduce product defects after injection molding. The lower bottom plate 3 and the limiting plate 4, as well as the mold core plate 5 and the limiting plate 4, are connected by screws. The lower mold box 15 is precisely positioned and laterally limited by the positioning block 17 and the limiting block 11. The positioning block 17 is connected to the mold core plate 5 by long screws 19. The specifications and number of long screws 19 are selected according to the size and stress of the positioning block 17 to ensure its stability and reliability. The top of the push rod 13 passes through the guide hole 24 inside the lower mold box 15. The design of the guide hole 24 ensures that the push rod 13 can move linearly during ejection, improving ejection efficiency. Efficiency is achieved by installing a cylinder, hydraulic cylinder, or electric cylinder at the bottom of the push rod 13 to drive the push rod 13 and push plate 12 to move, quickly ejecting the injection molded product from the mold cavity 16. The cooling system adopts a circulating water cooling method, and the cooling water is evenly distributed to the inside of the mold core plate 5 through the metal pipe 21 and heat conduction pipe 10, which effectively reduces the mold temperature during the injection process and improves the quality and efficiency of injection molding. The cooling system of the upper base plate 2 is independent of the cooling system of the mold core plate 5, but they can be cooled by the same cooling equipment to improve cooling efficiency. During the injection process, the molten plastic enters the mold cavity 16 through the injection pipe 6 and cools and forms in the mold cavity 16. After forming, the push plate 12 ejects the formed product from the mold cavity 16 through the push rod 13, completing one injection cycle. The cooling system works continuously throughout the injection process to ensure that the mold temperature is stable within a suitable range, thereby improving the quality and efficiency of injection molding.

[0022] In this embodiment, a side-limiting injection mold has a positioning plate 20 and positioning blocks 17 at both ends provided on the surface of the mold core plate 5. These are securely connected to the mold core plate 5 by long screws 19, ensuring the accurate positioning of the lower mold box 15 during the mold closing process. The limiting blocks 11 on the positioning plate 20 further limit the lower mold box 15 laterally, effectively preventing the mold cavity 16 from shifting due to pressure during the injection molding process, and improving the accuracy and stability of injection molding.

[0023] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A side-limiting injection mold, comprising an upper mold and a lower mold, wherein the upper mold includes an upper top plate and an upper bottom plate, the upper top plate and the upper bottom plate being connected by screws; the lower mold includes a lower bottom plate, a mold core plate and a limiting plate, the lower bottom plate and the limiting plate being connected by screws; the mold core plate and the limiting plate being connected by screws; an upper mold box is provided at one end of the upper bottom plate; a lower mold box is provided at one end of the mold core plate; the upper mold box and the lower mold box have hollow interiors; the upper mold box and the lower mold box together constitute a mold cavity, characterized in that: The surface of the mold core plate is provided with two positioning plates, and each end of the positioning plate is provided with a positioning block. The surface of the positioning block is provided with a long screw, and the positioning block is connected to the mold core plate through the long screw. The surface of the positioning plate is provided with a limiting block for limiting the lower mold box. The surface of the positioning plate is provided with several fixing plates by screws, and adjacent fixing plates are arranged at equal intervals. One end of the fixing plate is provided with a locking block, and the side of the locking block is connected to the surface of the lower mold box.

2. The injection mold with side limiting according to claim 1, characterized in that: The surface of the lower base plate is provided with two push plates, each push plate is provided with several vertical push rods, and the interior of the lower mold box is provided with several guide holes. One end of each push rod passes through the mold core plate and extends into the interior of the lower mold box, and the top of each push rod passes through the guide hole to achieve ejection.

3. The injection mold with side limiting according to claim 1, characterized in that: The surface of the upper top plate is provided with an injection tube, one end of which extends into the interior of the upper mold box.

4. The injection mold with side limiting according to claim 1, characterized in that: The mold core plate has several conductive metal tubes inside, one end of each metal tube extending to the outside of the mold core plate and having a liquid inlet at one end. The mold core plate also has a horizontally placed heat-conducting pipe inside, with one end of each metal tube connected to the heat-conducting pipe and both ends of the heat-conducting pipe extending to the outside of the mold core plate.

5. A side-limiting injection mold according to any one of claims 1-4, characterized in that: The upper base plate has several conductive connecting pipes inside, one end of each connecting pipe extends to the outside of the upper base plate, and one end of each connecting pipe has an inlet. The upper base plate also has a horizontally placed fixing pipe inside, one end of each connecting pipe is connected to the fixing pipe, and both ends of the fixing pipe extend to the outside of the upper base plate.

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