Injection mold with jacket type mold core and forming method

Abstract

The injection mold comprises a transversely-arranged movable mold core, an inner mold core and a fixed mold core are arranged in a core cavity of the movable mold core, the inner mold core is located on the right side of the core cavity, the right side face of the inner mold core is flush with the right side face of the movable mold core, and the fixed mold core is located on the left side of the core cavity. One end of the fixed mold core extends out of the core cavity, the extending end of the fixed mold core is sleeved with a fixed mold core fixing plate, the left side of the fixed mold core fixing plate is sequentially connected with a material pushing plate and a fixed mold fixing plate, the left side face of the fixed mold fixing plate is connected with a positioning ring through a first screw, and a main runner lining communicated with a rubber position is installed in the positioning ring. The outer side of the movable mold core is sequentially sleeved with a mold cavity plate, an ejector plate and a mold core fixing plate from left to right, and the right side of the movable mold core is sequentially connected with a supporting plate, a cushion block and a movable mold fixing plate. The forming part of the large and small bracket mold adopts a unique jacket type mold core structure, so that the boundary dimension of the mold is successfully reduced.

Description

Technical Field

[0001] The invention relates to the technical field of plastic injection molding, in particular to an injection mold with a jacket-type core and a molding method. Background Art

[0002] The number of cavities in a plastic injection molding mold is determined based on the output and precision of the plastic parts, the manufacturing cost of the mold and the specific parameters of the selected injection molding machine.

[0003] When a set of molds needs to mold two products at the same time, the solution of arranging the cavities side by side is often adopted, such as Figure 7 As shown. For some plastic parts with light weight but large dimensions, it is not economical to use a large-sized injection molding machine for molding. However, although a small-sized injection molding machine can meet the molding requirements in terms of injection volume and clamping force, it is difficult to fit a mold with too large dimensions. In view of the above problems, an injection mold with a jacket-type core is provided. Summary of the invention

[0004] In view of the above technical problems in the related art, the present invention provides an injection mold with a jacket-type core and a molding method, which can solve the above problems.

[0005] To achieve the above technical objectives, the technical solution of the present invention is implemented as follows: An injection mold with a sleeve-type core comprises a transversely arranged dynamic mold core, wherein an inner core and a fixed mold core are arranged in a core cavity of the dynamic mold core, wherein the inner core is located on the right side of the core cavity, and the inner core is flush with the right side surface of the dynamic mold core, the fixed mold core is located on the left side of the core cavity, and one end of the fixed mold core extends out of the core cavity, the extended end of the fixed mold core is sleeved with a fixed mold core fixing plate, the left side of the fixed mold core fixing plate is sequentially connected with a push plate and a fixed mold fixing plate, the left side of the fixed mold fixing plate is connected with a positioning ring by a screw, a main flow channel bushing connected to the glue position is installed in the positioning ring, the outer side of the dynamic mold core is sleeved with a cavity plate, a push plate, and a core fixing plate from left to right, and the right side of the dynamic mold core is sequentially connected with a support plate, a cushion block, and a dynamic mold fixing plate.

[0006] Furthermore, cooling circulation water channels are respectively provided in the dynamic mold core and the cavity plate.

[0007] Furthermore, guide sleeves are transversely arranged in the pusher plate and the cavity plate, a guide column is inserted in the guide sleeve, and one end of the guide column is connected to the core fixing plate.

[0008] Furthermore, a pulling sleeve is transversely arranged inside the core fixing plate and the pushing plate, an expanding sleeve is arranged at the left end of the pulling sleeve, and a second screw is connected to the left end of the expanding sleeve.

[0009] Furthermore, a distance rod is laterally arranged in the push plate, the fixed mold core fixing plate and the cavity plate, one end of the distance rod extends into the step hole in the fixed mold fixing plate, and the other end is connected to the die, and the fixed mold core fixing plate and the cavity plate are connected by three screws.

[0010] Furthermore, a pulling rod is transversely arranged in the fixed mold fixing plate, the pushing plate and the cavity plate, one end of the pulling rod is connected to the fixed mold fixing plate, and the other end extends into the pulling rod hole of the cavity plate.

[0011] Furthermore, a retaining ring is connected inside the cavity plate via screw 4, and the retaining ring is coaxial with the pulling rod hole.

[0012] Furthermore, the core fixing plate, the supporting plate, the cushion block, and the movable mold fixing plate are connected by screw five, the cushion block is a circular ring structure, the left side of the movable mold fixing plate is connected with a push plate, and the left side of the push plate is connected with a push rod fixing plate by screw six, and a push rod is transversely provided in the inner core, the supporting plate, the inner space of the cushion block and the push rod fixing plate, one end of the push rod is connected to the push rod fixing plate, and the other end extends into the right side of the fixed mold core.

[0013] A molding method for an injection mold with a sleeve-type core, comprising the following steps: after the mold is opened, the expansion sleeve drives the cavity plate and the fixed mold core fixing plate to move right, and the injection mold performs the first parting from Ⅰ-Ⅰ until the bottom of the pull rod hole in the cavity plate contacts the retaining ring; under the continued drive of the expansion sleeve, the concave mold drives the distance rod so that the distance rod pushes the push plate to move right, and the injection mold performs the second parting from Ⅱ-Ⅱ, when the end shoulder of the distance rod contacts the step surface of the step hole in the fixed mold fixing plate, the push plate stops moving, and the casting system solidified material pushed out by the push plate is removed from The inner bracket and the outer bracket after molding are pushed out from the mold by the push rod and the push plate respectively; wherein Ⅰ-Ⅰ is the connection surface between the push plate and the fixed mold core fixing plate, Ⅱ-Ⅱ is the connection surface between the fixed mold fixing plate and the push plate, Ⅲ-Ⅲ is the connection surface between the push plate and the cavity plate, and Ⅳ-Ⅳ is the connection surface between the push plate and the core fixing plate.

[0014] Furthermore, the fixed mold core is used to mold the top surface, inner surface of the small bracket and the bottom surface of the large bracket; the cavity plate is used to mold the outer surface of the large bracket; the push plate is used to mold the top surface of the large bracket; the inner core is used to mold the bottom surface of the small bracket; and the dynamic mold core is used to simultaneously mold the outer surface of the small bracket and the inner surface of the large bracket.

[0015] Beneficial effects of the present invention: The molding part of the large and small bracket molds of the present application adopts a unique jacket-type core structure, which successfully reduces the outer dimensions of the mold. The mold operates smoothly and reliably during the mold trial process, and the molded parts have a flat and beautiful appearance and qualified dimensions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] The present invention is further described in detail below with reference to the accompanying drawings.

[0018] Figure 1 is a side view of an injection mold with a jacket-type core according to an embodiment of the present invention; Figure 2 yes Figure 1 Cross-sectional view of AA in the middle; Figure 3 yes Figure 2 Cross-section of the middle BB; Figure 4 is a cross-sectional view of the connection between the dynamic mold core, the inner mold core and the fixed mold core according to an embodiment of the present invention; Figure 5 is a cross-sectional view of a dynamic model core according to an embodiment of the present invention; Figure 6 is a schematic structural diagram of the large and small brackets according to an embodiment of the present invention; Figure 7 It is a schematic diagram of a mold with cavities arranged side by side.

[0019] In the figure: 1. Moving mold fixing plate; 2. Pad; 3. Push plate; 4. Push rod fixing plate; 5. Push rod; 6. Reset rod; 7. Support plate; 8. Core fixing plate; 9. Moving mold core; 10. Inner core; 11. Push plate; 12. Cavity plate; 13. Fixed mold core; 14. Water nozzle one; 15. Fixed mold core fixing plate; 16. Fixed mold fixing plate; 17. Push plate; 18. Pull rod; 19. Main channel bushing; 20. Positioning ring; 21. Screw one; 22. Water nozzle two; 23. Guide column; 24. Guide sleeve; 25. Water plug two; 26. Screw five; 27. Screw six; 28. Pull sleeve; 29. ​​Expansion sleeve; 30. Screw two; 31. Screw four; 32. Retaining ring; 33. Distance pull rod; 34. Screw three; 35. Large bracket; 36. Small bracket. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0021] like Figure 1-6 As shown, according to the present invention, an injection mold with a sleeve-type core is disclosed, comprising a horizontally arranged dynamic mold core 9, wherein an inner mold core 10 and a fixed mold core 13 are arranged in a core cavity of the dynamic mold core 9, wherein the inner mold core 10 is located on the right side of the core cavity, and the inner mold core 10 and the right side surface of the dynamic mold core 9 are flush, and the fixed mold core 13 is located on the left side of the core cavity, and one end of the fixed mold core 13 extends out of the core cavity, and the extended end of the fixed mold core 13 is sleeved with a fixed mold The core fixing plate 15, the left side of the fixed mold core fixing plate 15 is connected with a push plate 17 and a fixed mold fixing plate 16 in sequence, the left side of the fixed mold fixing plate 16 is connected to a positioning ring 20 by a screw 21, and a main flow channel bushing 19 connected to the glue position is installed in the positioning ring 20, the outer side of the movable mold core 9 is sequentially sleeved with a cavity plate 12, a push plate 11, and a core fixing plate 8 from left to right, and the right side of the movable mold core 9 is sequentially connected with a support plate 7, a cushion block 2, and a movable mold fixing plate 1.

[0022] Embodiment 1: like Figure 6 As described above, the plastic parts formed in the present application are a large bracket 35 and a small bracket 36, which have the same structure, except that their sizes are different. Figure 2 , Figure 4 , Figure 5As shown, the core cavity of the dynamic model core 9 includes two left and right mounting grooves, wherein a fixed model core 13 is installed in the left mounting groove, and an inner core 10 is installed in the right mounting groove, and the outer open ends of the left mounting groove and the right mounting groove are provided with step surfaces for positioning the fixed model core 13 and the inner core 10, and a cavity plate 12 and a push plate 11 are sleeved on the outer side of the dynamic model core 9 to form a jacket-type core structure, wherein the fixed model core 13 is used to form the top surface and inner surface of the small bracket 36 and the bottom surface of the large bracket 35, the cavity plate 12 is used to form the outer surface of the large bracket 35, the push plate 11 is used to form the top surface of the large bracket 35, the inner core 10 is used to form the bottom surface of the small bracket 36, and the dynamic model core 9 is used to simultaneously form the outer surface of the small bracket 36 and the inner surface of the large bracket 35. This unique jacket-type core structure is the core molding part for realizing the simultaneous molding of two inner and outer parts of this set of molds. Since each plate and core are relatively independent and the structure is not complicated, processing and manufacturing are relatively convenient. If the traditional cavity side-by-side arrangement is adopted, the maximum outer dimension of the mold is 560×450mm. It needs to be formed by an injection molding machine with an injection volume of not less than 500 grams. However, by adopting the structure of the present application, the outer dimension of the mold is reduced to 420×360mm, which can be directly installed on an injection molding machine with an injection volume between 300 grams and 350 grams.

[0023] Embodiment 2: In the present application, cooling circulation water circuits are respectively provided in the dynamic model core 9 and the cavity plate 12. The cooling circulation water circuits include water nozzles for water inlet and outlet and water plugs for water blocking at the ends. For example, the cooling circulation water circuit in the dynamic model core 9 includes water nozzle 22 (long water nozzle) and water plug 25, and the cooling circulation water circuit in the cavity plate 12 includes water nozzle 1 14 and water plug 1. The mold is cooled and cooled through the cooling circulation water circuit during molding.

[0024] Embodiment three: In the present application, a guide sleeve 24 is horizontally arranged in the push plate 11 and the cavity plate 12, and a guide column 23 is inserted in the guide sleeve 24. One end of the guide column 23 is connected to the core fixing plate 8. When performing III-III treatment and IV-IV treatment, the guide sleeve 24 and the guide column 23 can assist the guiding movement.

[0025] Implementation 4: In the present application, after the mold is opened, the expansion sleeve 29 drives the cavity plate 12 and the fixed mold core fixing plate 15 to move right, and the injection mold performs the first parting from Ⅰ-Ⅰ until the bottom of the pull rod hole in the cavity plate 12 contacts the retaining ring 32; under the continued drive of the expansion sleeve 29, the concave mold drives the distance rod 33 so that the distance rod 33 pushes the push plate 17 to move right, and the injection mold performs the second parting from Ⅱ-Ⅱ. When the end shoulder of the distance rod 33 contacts the step surface of the step hole in the fixed mold fixing plate 16, the push plate 17 stops moving, and the casting system solidified material pushed out by the push plate 17 is separated from the fixed mold fixing plate 16 and the fixed mold core The inner bracket and the outer bracket after molding are pushed out from the mold by the push rod 5 and the push plate 11 respectively; wherein Ⅰ-Ⅰ is the connection surface between the push plate 17 and the fixed mold core fixing plate 15, Ⅱ-Ⅱ is the connection surface between the fixed mold fixing plate 16 and the push plate 17, Ⅲ-Ⅲ is the connection surface between the push plate 11 and the cavity plate 12, and Ⅳ-Ⅳ is the connection surface between the push plate 11 and the core fixing plate 8.

[0026] The injection mold for the large and small brackets of this application adopts a point gate feeding method, and the gate is designed at the top of the side vertical plate of the plastic part. In order to reduce the labor intensity of workers and improve production efficiency, this mold adopts an automatic point gate form to achieve fully automatic production.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An injection mold with a jacket-type core, characterized in that: The invention comprises a horizontally arranged dynamic model core (9), wherein an inner mold core (10) and a fixed mold core (13) are arranged in a core cavity of the dynamic model core (9), wherein the inner mold core (10) is located on the right side of the core cavity, and the right side surfaces of the inner mold core (10) and the dynamic model core (9) are flush, and the fixed mold core (13) is located on the left side of the core cavity, and one end of the fixed mold core (13) protrudes out of the core cavity, and the protruding end of the fixed mold core (13) is sleeved with a fixed mold core fixing plate (15), and the fixed mold core fixing plate (15) is connected to the fixed mold core fixing plate (15). The left side of the movable mold core (9) is connected to a push plate (17) and a fixed mold fixing plate (16) in sequence, the left side of the fixed mold fixing plate (16) is connected to a positioning ring (20) by means of a screw (21), a main flow channel bushing (19) connected to the glue position is installed in the positioning ring (20), the outer side of the movable mold core (9) is sleeved with a cavity plate (12), a push plate (11), and a core fixing plate (8) in sequence from left to right, and the right side of the movable mold core (9) is connected to a support plate (7), a cushion block (2), and a movable mold fixing plate (1) in sequence.

2. The injection mold with a jacket-type core according to claim 1, characterized in that: The dynamic mold core (9) and the cavity plate (12) are respectively provided with cooling circulation water circuits.

3. The injection mold with a jacket-type core according to claim 1, characterized in that: A guide sleeve (24) is transversely arranged inside the pusher plate (11) and the cavity plate (12), a guide column (23) is inserted into the guide sleeve (24), and one end of the guide column (23) is connected to the core fixing plate (8).

4. The injection mold with a jacket-type core according to claim 1, characterized in that: A pull sleeve (28) is transversely arranged inside the core fixing plate (8) and the push plate (11), an expansion sleeve (29) is arranged at the left end of the pull sleeve (28), and a second screw (30) is connected to the left end of the expansion sleeve (29).

5. The injection mold with a jacket-type core according to claim 1, characterized in that: A spacing rod (33) is transversely arranged inside the push plate (17), the fixed mold core fixing plate (15) and the cavity plate (12); one end of the spacing rod (33) extends into a step hole in the fixed mold fixing plate (16), and the other end is connected to the die; the fixed mold core fixing plate (15) and the cavity plate (12) are connected by screw three (34).

6. The injection mold with a jacket-type core according to claim 1, characterized in that: A pulling rod (18) is transversely arranged inside the fixed mold fixing plate (16), the pushing plate (17) and the cavity plate (12); one end of the pulling rod (18) is connected to the fixed mold fixing plate (16), and the other end extends into the pulling rod hole of the cavity plate (12).

7. The injection mold with a jacket-type core according to claim 6, characterized in that: A retaining ring (32) is connected inside the cavity plate (12) via screw four (31), and the retaining ring (32) is coaxial with the drawing rod hole.

8. The injection mold with a jacket-type core according to claim 1, characterized in that: The core fixing plate (8), the support plate (7), the cushion block (2), and the movable mold fixing plate (1) are connected by screw five (26); the cushion block (2) is a circular ring structure; the left side of the movable mold fixing plate (1) is connected to a push plate (3); the left side of the push plate (3) is connected to a push rod fixing plate (4) by screw six (27); a push rod (5) is transversely arranged in the inner space of the inner core (10), the support plate (7), the cushion block (2), and the push rod fixing plate (4); one end of the push rod (5) is connected to the push rod fixing plate (4), and the other end extends into the right side of the fixed mold core (13).

9. A molding method of the injection mold according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: after the mold is opened, the expansion sleeve (29) drives the cavity plate (12) and the fixed mold core fixing plate (15) to move rightward, and the injection mold performs the first mold separation from position Ⅰ-Ⅰ until the bottom of the pull rod hole in the cavity plate (12) contacts the retaining ring (32); under the continued drive of the expansion sleeve (29), the die drives the distance rod (33) so that the distance rod (33) pushes the push plate (17) to move rightward, and the injection mold performs the second mold separation from position Ⅱ-Ⅱ. When the end shoulder of the distance rod (33) contacts the step surface of the step hole in the fixed mold fixing plate (16), the push plate (17) stops moving, and the casting system solidified material pushed out by the push plate (17) is ejected from the fixed mold fixing plate (16). 6) falls into the gap between the fixed mold core fixing plate (15); then, the injection mold is split for the third time from III-III, and the movable mold part is separated from the fixed mold part; finally, the injection machine is ejected, and the injection mold is split for the fourth time from IV-IV, and the molded inner bracket and outer bracket are pushed out of the injection mold by the push rod (5) and the push plate (11) respectively; wherein I-I is the connection surface between the push plate (17) and the fixed mold core fixing plate (15), II-II is the connection surface between the fixed mold fixing plate (16) and the push plate (17), III-III is the connection surface between the push plate (11) and the cavity plate (12), and IV-IV is the connection surface between the push plate (11) and the core fixing plate (8).

10. A molding method of an injection mold with a jacket-type core according to claim 9, characterized in that: The fixed mold core (13) is used to mold the top surface and inner surface of the small bracket and the bottom surface of the large bracket; the cavity plate (12) is used to mold the outer surface of the large bracket; the push plate (11) is used to mold the top surface of the large bracket; the inner mold core (10) is used to mold the bottom surface of the small bracket; and the movable mold core (9) is used to simultaneously mold the outer surface of the small bracket and the inner surface of the large bracket.

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