Injection mold with in-mold sprue breaking function

Abstract

The utility model discloses an injection mold with an in-mold sprue breaking function, which comprises a first mold, a second mold, a third mold and a fourth mold, a casting mold groove is formed in the second mold; the third mold, the inner mold core and the casting mold groove jointly form a casting mold cavity; the injection molding part is inserted into the second mold and is provided with an injection molding opening; the sprue breaking mechanism comprises a cutter, an inner rod piece, an outer pipe piece and an ejector rod, the cutter is located on a connecting block at the end of the inner rod piece, the end of the cutter extends upwards to form a blade, the connecting block axially abuts against the inner wall of the first mold, an outer thread groove of the inner rod piece is in threaded connection with an inner thread of the outer pipe piece, and the second mold, the first mold, the outer pipe piece and the ejector rod are in butt joint with the driving device. When the injection mold is used, the injection pouring gate is in the mold and can be cut off before mold opening, so that the quality problems of deformation, abrasion and the like of an injection finished product due to the influence of the pouring gate during mold opening caused by a common processing mode of cutting off the pouring gate after mold opening are avoided, and the injection molding efficiency and quality are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, and specifically relates to an injection mold with an in-mold gate breakage mechanism. Background Art

[0002] When a common injection mold is in use, the injection gate is generally cut off after the mold is opened. This causes quality problems such as deformation and wear of the injection molded product during the mold opening period due to the adhesion of the gate formed together with it to the device, and the mold opening resistance is large, affecting the injection efficiency and quality. Summary of the Utility Model

[0003] The purpose of the utility model is to solve the problem that when a common injection mold is in use, the injection gate is generally cut off after the mold is opened, resulting in quality problems such as deformation and wear of the injection molded product during the mold opening period due to the adhesion of the gate formed together with it to the device, and the mold opening resistance is large, affecting the injection efficiency and quality. Therefore, an injection mold with an in-mold gate breakage mechanism is provided.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme: An injection mold with an in-mold gate breakage mechanism, comprising:

[0005] A first mold, with an inner mold core arranged on its top;

[0006] A second mold, with a casting mold groove opened on it;

[0007] A third mold, which is assembled on the first mold and the second mold, and together with the inner mold core and the casting mold groove forms a casting mold cavity;

[0008] An injection molded part, which is inserted on the second mold and is provided with an injection port, and the injection port communicates with the casting mold cavity;

[0009] A gate breakage mechanism, including a cutter located inside the inner mold core, an inner rod member and an outer pipe member inserted into the first movable cavity of the first mold, and a top rod inserted into the second movable cavity of the inner rod member and facing the cutter. The cutter is located on the connecting block at the end of the inner rod member, and a blade extends upward from its end. The connecting block axially abuts against the inner wall of the first mold. The external thread groove of the inner rod member is screwed with the internal thread in the third movable cavity of the outer pipe member. The second mold, the first mold, the outer pipe member, and the top rod are respectively docked with a driving platform and a driving device for driving their axial movement.

[0010] As a further description of the above technical solution:

[0011] One side of the injection port close to the casting mold cavity gradually converges outward.

[0012] As a further description of the above technical solution:

[0013] The first movable cavity is in an I-shaped structure, and a bearing is arranged therein. The bearing is sleeved on the inner rod member, and its end face abuts against the end of the inner rod member.

[0014] As a further description of the above technical solution:

[0015] A buffer member is sleeved outside the ejector rod, and the buffer member is inserted into the third movable cavity.

[0016] As a further description of the above technical solution:

[0017] A spring is arranged between the buffer member and the third movable cavity.

[0018] In summary, due to the adoption of the above technical solution, the present utility model has the following

[0019] beneficial effects compared with the prior art:

[0020] 1. When the injection mold is used, the injection gate can be cut off in the mold before mold opening, avoiding quality problems such as deformation and wear of the injection molded product caused by the influence of the gate during mold opening in the common processing method of cutting the gate after mold opening, and improving the injection efficiency and quality.

[0021] 2. The operation of cutting off the gate in the mold is specifically as follows: the ejector rod presses the cutter tightly, so that the blade presses the injection gate at the gap between the injection molded part and the connecting block, and drives the outer pipe member to move downward. During this period, the buffer member buffers it, axially guides it, and laterally limits it. In a screwed connection manner, the inner rod member is axially limited by the first die, rotates, and synchronously drives the cutter to rotate, so that the blade circumferentially cuts the gate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic structural diagram of an injection mold for cutting off the gate in the mold.

[0024] Figure 2 It is an exploded view of an injection mold for cutting off the gate in the mold.

[0025] Figure 3 It is a cross-sectional view of an injection mold for cutting off the gate in the mold.

[0026] Figure 4 It is Figure 3Enlarged view of part A

[0027] Legend:

[0028] 1. First mold; 11. Inner mold core; 12. Casting cavity; 13. First movable cavity; 14. Bearing; 2. Second mold; 21. Casting groove; 3. Third mold; 4. Injection molded part; 41. Injection port; 5. Cutting tool; 51. Blade; 6. Inner rod; 61. Connecting block; 62. External thread groove; 63. Second movable cavity; 7. Outer pipe fitting; 71. Third movable cavity; 72. Internal thread; 8. Ejector rod; 9. Buffer; 91. Spring. Specific implementation mode

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0031] Please refer to Figures 1-4 , the present invention provides a technical solution: an injection mold with in-mold gate breaking, including:

[0032] The first mold 1, with an inner mold core 11 provided at its top;

[0033] The second mold 2, with a casting groove 21 opened thereon;

[0034] The third mold 3, which is assembled on the first mold 1 and the second mold 2 and jointly forms a casting cavity 12 with the inner mold core 11 and the casting groove 21;

[0035] The injection molded part 4, which is inserted on the second mold 2, has an injection port 41 opened thereon, and the injection port 41 communicates with the casting cavity 12;

[0036] The gate-breaking mechanism includes a cutter 5 located inside the inner mold core 11, an inner rod member 6 and an outer pipe member 7 inserted into the first moving cavity 13 of the first mold 1, and a ejector rod 8 inserted into the second moving cavity 63 of the inner rod member 6 and facing the cutter 5. The cutter 5 is located on the connecting block 61 at the end of the inner rod member 6, and a blade 51 extends upward from its end. The connecting block 61 axially abuts against the inner wall of the first mold 1. The external thread groove 62 of the inner rod member 6 is screwed with the internal thread 72 in the third moving cavity 71 of the outer pipe member 7. The second mold 2, the first mold 1, the outer pipe member 7, and the ejector rod 8 are respectively butted with a driving platform and a driving device for driving their axial movement.

[0037] One side of the injection port 41 close to the casting mold cavity 12 gradually converges outward.

[0038] The first moving cavity 13 is of an I-shaped structure, and a bearing 14 is arranged therein. The bearing 14 is sleeved on the inner rod member 6, and its end face abuts against the end of the inner rod member 6.

[0039] A buffer member 9 is sleeved outside the ejector rod 8, and the buffer member 9 is inserted into the third moving cavity 71.

[0040] A spring 91 is arranged between the buffer member 9 and the third moving cavity 71.

[0041] The working principle of an in-mold gate-breaking injection mold in this embodiment includes: As Figure 3 shown, after injection molding is completed, when gate-breaking and mold opening are carried out, the ejector rod is driven, and the corresponding driving platform is driven to move upward by an external driving device cylinder. The ejector rod 8 presses the cutter 5 tightly, so that the blade 51 presses the injection gate at the gap between the injection molded part 4 and the connecting block 61. The outer pipe member 7 is driven to move downward. During this period, the buffer member 9 buffers it, axially guides it, and laterally limits it. In a screwed connection manner, the inner rod member 6 is axially limited by the first mold 1, rotates, and synchronously drives the cutter 5 to rotate, so that the blade 51 circumferentially cuts the gate, enabling the injection gate to be cut off in the mold before mold opening, avoiding quality problems such as deformation and wear of the injection molded product during mold opening caused by the common processing method of cutting the gate after mold opening, and improving the injection molding efficiency and quality. After the gate is cut off, the first mold 1 and the second mold 2 can be driven to move away from each other to complete the demolding of the injection molded product and take it out.

[0042] To sum up, due to the adoption of the above technical solutions, an in-mold gate-breaking injection mold in this embodiment has the following beneficial effects compared with the prior art:

[0043] 1. When this injection mold is in use, the injection gate can be cut off inside the mold before mold opening, avoiding quality problems such as deformation and wear of the injection molded product during mold opening caused by the common processing method of cutting the gate after mold opening, and improving the injection efficiency and quality.

[0044] 2. The specific operation of cutting off the gate in the mold is as follows: the ejector rod presses the cutter tightly, so that the blade presses the injection gate at the gap between the injection molded part and the connecting block. The outer pipe fitting is driven to move downward. During this period, the buffer part buffers it, guides it axially, and limits it laterally. In a screwed connection manner, the inner rod is axially limited by the first mold, rotates, and synchronously drives the cutter to rotate, so that the blade cuts the gate in a circular manner.

[0045] The above is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent replacements or changes, and should be covered within the protection scope of the present utility model.

Claims

1. An injection mold with an in-mold gate, characterized in that: include: The first mold has an inner mold core disposed on the top; A second mold having a mold groove formed therein; A third mold, which is assembled on the first mold and the second mold, and together with the inner mold core and the mold groove forms a mold cavity; An injection molded part, which is inserted into the second mold and has an injection port, the injection port being connected to the mold cavity; The gate-breaking mechanism comprises a cutter located on the inner side of the inner mold core, an inner rod and an outer tube penetrating the first movable cavity of the first mold, and a push rod penetrating the second movable cavity of the inner rod and facing the cutter. The cutter is located on a connecting block at the end of the inner rod, and a blade extends upward from the end of the inner rod. The connecting block is axially abutted against the inner wall of the first mold. The outer thread groove of the inner rod is screwed with the inner thread in the third movable cavity of the outer tube. The second mold, the first mold, the outer tube, and the push rod are respectively connected to a driving platform and a driving device that drive their axial movements.

2. The injection mold with an in-mold gate break gate according to claim 1, characterized in that: The side of the injection port close to the mold cavity gradually converges outwards.

3. The injection mold with an in-mold gate break gate according to claim 1, characterized in that: The first movable cavity is an I-shaped structure, in which a bearing is arranged. The bearing is sleeved on the inner rod, and the end surface of the bearing abuts against the end of the inner rod.

4. The injection mold with an in-mold gate break gate according to claim 1, characterized in that: A buffer is sleeved on the outer side of the push rod, and the buffer is inserted into the third active cavity.

5. The injection mold with an in-mold gate break gate according to claim 4, characterized in that: A spring is arranged between the buffer member and the third active chamber.

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