Injection mold
By designing a detachable cold material well structure, the problems of poor cold material collection and difficult demolding were solved, achieving efficient collection of cold material and easy demolding, reducing part wear, and simplifying the processing and maintenance process.
Patent Information
- Application Number
- CN202423273320.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-28
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2034-12-28
AI Technical Summary
Existing cold slug well structures for injection molds suffer from problems such as poor cold slug collection, difficulty in demolding, and high processing and maintenance costs.
An injection mold was designed with a cold slug well structure in which the ejector pin and insert are detachably connected. The cold slug well is formed by the first groove on the ejector pin and the second groove on the insert. The slider drives the insert to move along the second direction to detach from the cold slug, thus avoiding the cold slug from exerting a pulling force on the product. Combined with the inclined surface design, stress is reduced. The ejector pin and insert can be disassembled separately for easy processing and maintenance.
It achieves efficient collection of cold material and easy demolding, reduces part wear, extends service life, and simplifies processing and maintenance.
Smart Images
Figure CN223802984U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of injection mold, and in particular to an injection mold. BACKGROUND
[0002] The precise injection mold is a key tool for injection molding, and the quality and performance of the mold directly affect the quality and production efficiency of the plastic products. With the wide application of plastic products in the fields of automobile, electronics, medical treatment, aerospace, etc., the requirements for the injection mold are also increasingly high.
[0003] The cold material well is an important component of the injection mold, and mainly functions to collect the low-temperature cold material in the front stage during the injection molding process, so as to prevent the cold material from entering the cavity, thereby avoiding the surface defects and performance degradation of the products. In the related technology, the cold material well structure has many limitations, such as poor cold material collection effect, difficult demolding, high processing and maintenance cost, etc. CONTENT OF THE INVENTION
[0004] Therefore, the present application provides an injection mold to solve the above problems.
[0005] The present application provides an injection mold, which comprises a substrate, a first mold plate, a second mold plate, an ejector rod and a cold material well assembly. The first mold plate is located on the substrate. The first mold plate is located between the second mold plate and the substrate, and a cavity is formed between the first mold plate and the second mold plate. The direction from the first mold plate to the second mold plate is the first direction. The ejector rod comprises a first end and a second end arranged oppositely. The first end is fixed to the substrate, and the second end is used to penetrate through the second mold plate and extend into the cavity. The second end has a first groove. The cold material well assembly is located in the cavity. The cold material well assembly comprises a sliding block and an insert connected with the sliding block. The insert has a second groove with an opening facing the second mold plate. The sliding block, the first mold plate and the second mold plate form a cavity for forming a product. The insert is installed on the second end. When the first mold plate and the second mold plate are closed, the first groove and the second groove form a cold material well with an opening facing the second mold plate. The cold material well is in communication with the cavity. When the first mold plate and the substrate are separated, the first mold plate drives the second mold plate to move along the first direction. When the first mold plate and the second mold plate are separated, the sliding block drives the insert to move along the second direction away from the cavity, so that the ejector rod and the insert are separated.
[0006] In some embodiments, the second end has a gap, the insert comprises an insert block, the second groove is located on the insert block, the insert block has a side surface in communication with the second groove, and the gap has a side wall. The side surface and the side wall fit to form the cold material well.
[0007] In some embodiments, the side surface and the side wall are both inclined surfaces, the gap has a bottom wall, and the bottom wall is used to fit with the bottom surface of the insert block. In the first direction, the side wall is inclined away from the bottom wall.
[0008] In some embodiments, the top surface of the insert block further has a boss arranged along the edge of the second groove, and a communication cavity is arranged between the cold sprue and the cavity, and the boss, the second mold plate and the slide block enclose the communication cavity.
[0009] In some embodiments, the insert further comprises a mounting block connected to the insert block, the mounting block is fixedly connected to the slide block, and the injection mold further comprises a pull block connected to the slide block, the pull block is used to drive the slide block to move along the second direction when the pull block moves along the first direction.
[0010] In some embodiments, the injection mold further comprises a third mold plate between the first mold plate and the second mold plate, the third mold plate has a first through hole, the ejector rod is arranged in the first through hole, the slide block is arranged on the third mold plate, and an elastic member is arranged between the third mold plate and the slide block, the elastic member is used to drive the slide block to move away from the third mold plate when the first mold plate and the second mold plate are separated.
[0011] In some embodiments, the slide block comprises a first block and a second block connected to the first block, the insert is fixedly connected to the first block, in the first direction, the second block protrudes from the first block, the elastic member is arranged between the side surface of the second block and the third mold plate, the first block has a first protrusion on one side surface, a gap is left between the first protrusion and the first block, the pull block has a second protrusion arranged in the gap, and the surface of the first protrusion facing the second block is an inclined surface, so that the first protrusion is driven to move along the second direction when the pull block moves along the first direction.
[0012] In some embodiments, the cold sprue has a cylindrical profile.
[0013] In some embodiments, the slide block has a receiving groove, and the insert is fixed to the slide block by a locking member.
[0014] In some embodiments, the second mold plate further has a hot runner plate arranged thereon, and the hot runner plate is used to deliver molten raw material into the cavity.
[0015] In the injection mold of this application, the cold slug well is formed by a first groove on the ejector pin and a second groove on the insert, and the ejector pin and the insert are detachably connected. Under the action of external force, when the first template and the substrate separate, the first template drives the second template and the cold slug well assembly to move away from the substrate. At this time, neither the cold material nor the product in the cold slug well is subjected to force, and it is not easy to deform. At this time, the second end of the ejector pin detaches from the cold material and separates from the insert. When the first and second templates separate, the slider drives the insert to move along the second direction and detach from the cold material. At this time, the cold material completely detaches from the ejector pin and the insert. At this time, the product is not subjected to the tension brought by the cold material. The product is then ejected. Therefore, in this process, the product will not be damaged due to the tension caused by the imbalance of forces between the cold material and the product. Meanwhile, during this process, cold material can be collected in the cold slug well, and the product will not be deformed when the cold material and the product are demolded, making demolding easier; on the other hand, the cold slug well formed by the combination of ejector pins and inserts has a gap at the connection between the first and second grooves of the ejector pins, which is conducive to venting and also helps to reduce the impact force of the hot melt plastic front end under high temperature molten state, which is conducive to cold material collection and reduces wear on parts, extending the service life of parts; the ejector pins and inserts that make up the cold slug well can be disassembled separately, which is convenient for processing and maintenance. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of the injection mold provided in the embodiments of this application.
[0017] Figure 2 for Figure 1 The diagram shows a partial exploded view of the injection mold.
[0018] Figure 3 for Figure 2 The diagram shows the structure of the injection mold after the second template has been removed.
[0019] Figure 4 for Figure 2 The injection mold shown is a cross-sectional view along IV-IV.
[0020] Figure 5 for Figure 4 The enlarged structural diagram of the first and second templates when they are joined together in part B is shown.
[0021] Figure 6 for Figure 4 The enlarged structural diagram of part B when the second template is removed is shown.
[0022] Figure 7 for Figure 3 An exploded view of the push rod and insert in the cold slug well assembly shown.
[0023] Figure 8 for Figure 3The cold material well assembly is shown in the structure diagram of the combination of the ejector rod and the insert.
[0024] Figure 9 For Figure 4 The first template is separated from the substrate when the second template is removed in the B part shown in the enlarged structural diagram.
[0025] Figure 10 For Figure 4 The first template is separated from the substrate and the insert moves along the second direction after the second template is removed in the B part shown in the enlarged structural diagram.
[0026] Figure 11 For Figure 3 The cold material well assembly is shown in the structure diagram of the combination of the ejector rod and the insert.
[0027] Figure 12 For Figure 3 The cold material well assembly is shown in the structure diagram of the combination of the ejector rod and the insert.
[0028] Main element symbol explanation
[0029] Injection mold 100, first fixed plate 11, second fixed plate 12, hot runner plate 20, second template 30, first template 40, second through hole 41, substrate 50, ejector rod plate 60, ejector rod 70, first end 71, second end 72, first recess 73, notch 74, side wall 741, bottom wall 742, cold material well assembly 80, sliding block 81, first block 811, second block 812, first protrusion 813, gap 814, mounting groove 815, accommodating groove 816, insert 82, insert block 821, side surface 8211, second recess 8212, boss 822, mounting block 823, pull block 91, second protrusion 92, third template 93, first through hole 931, elastic member 94, cavity 95, cold material well 96, communication cavity 97, cavity body 98, first direction X, second direction Y, product 200, cold material 210.
[0030] The following specific embodiments will be combined with the above-mentioned drawings Figures 1-12 Further illustrate the present application. Specific embodiments
[0031] The technical solutions in the embodiments of the present application will be described clearly and completely in the following combined with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all.
[0032] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. Where, when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or intervening elements can also be present. Where an element is referred to as being "provided on" another element, it can be directly provided on the other element or intervening elements can also be present.
[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
[0034] In order to further clarify the technical means and effects adopted by the present application to achieve the predetermined purpose, the following will be described in detail in conjunction with the drawings and embodiments.
[0035] The present application provides an injection mold, comprising a substrate, a first mold plate, a second mold plate, an ejector pin and a cold well assembly, the first mold plate is located on the substrate; the first mold plate is located between the second mold plate and the substrate, a cavity is formed between the first mold plate and the second mold plate, and the direction from the first mold plate to the second mold plate is the first direction; the ejector pin comprises a first end and a second end arranged oppositely, the first end is fixed on the substrate, the second end is used to penetrate the second mold plate and extend into the cavity, and the second end has a first groove; the cold well assembly is located in the cavity, the cold well assembly comprises a slider and an insert connected with the slider, the insert has a second groove with an opening facing the second mold plate, a mold cavity for forming a product is formed between the slider, the first mold plate and the second mold plate, the insert is installed on the second end, when the first mold plate and the second mold plate are closed, the first groove and the second groove form a cold well with an opening facing the second mold plate, and the cold well is in communication with the mold cavity; when the first mold plate and the substrate are separated, the first mold plate drives the second mold plate to move along the first direction; when the first mold plate and the second mold plate are separated, the slider is used to drive the insert to move along the second direction away from the mold cavity, so that the ejector pin and the insert are separated.
[0036] Please refer to Figure 1 , Figure 2 and Figure 3 , the present application provides an injection mold 100, comprising a first fixed plate 11, a hot runner plate 20, a second mold plate 30, a first mold plate 40, a substrate 50, a pin plate 60 and a second fixed plate 12 arranged in sequence, the first fixed plate 11 and the second fixed plate 12 are arranged oppositely, and the injection mold 100 is fixed on a machine table (not shown in the figure) or other equipment through the first fixed plate 11 and the second fixed plate 12.
[0037] Please refer to Figure 5The hot runner plate 20 is used to guide the molten plastic into the cavity 95 of the mold to form the product 200. The ejector plate 60 is used to eject the product 200 out of the cavity 95 after the injection molding is completed.
[0038] Referring to Figure 4 , Figure 5 and Figure 6 , the injection mold 100 further comprises an ejector pin 70 and a cold slug well assembly 80. A cavity 98 is formed between the first mold plate 40 and the second mold plate 30, and the direction from the first mold plate 40 to the second mold plate 30 is the first direction X. The flow channel in the hot runner plate 20 is in communication with the cavity 98. The ejector pin 70 comprises a first end 71 and a second end 72 oppositely arranged, the first end 71 is fixed to the base plate 50, and the second end 72 is used to extend into the cavity 98 through the second mold plate 30, and the second end 72 has a first recess 73 (see Figure 7 ). The cold slug well assembly 80 is located in the cavity 98, and the cold slug well assembly 80 comprises a slider 81 and an insert 82 connected with the slider 81, the insert 82 has a second recess 8212 (see Figure 7 ) with an opening facing the second mold plate 30, the slider 81, the first mold plate 40 and the second mold plate 30 form the cavity 95 for forming the product 200, and the insert 82 is installed on the second end 72. When the first mold plate 40 and the second mold plate 30 are closed, the first recess 73 and the second recess 8212 form a cold slug well 96 with an opening facing the second mold plate 30, as Figure 5 , the cold slug well 96 is in communication with the cavity 95.
[0039] Referring to Figure 5 , Figure 9 and Figure 10 , when the first mold plate 40 is separated from the base plate 50, the first mold plate 40 drives the second mold plate 30 to move along the first direction X, and when the first mold plate 40 and the second mold plate 30 are separated, the slider 81 is used to drive the insert 82 to move along the second direction Y away from the cavity 95, and the second direction Y is perpendicular to the first direction X, so that the ejector pin 70 and the insert 82 are separated.
[0040] In the injection mold 100 of the present application, the cold material well 96 is formed by the first groove 73 on the ejector pin 70 and the second groove 8212 on the insert 82, and the ejector pin 70 and the insert 82 are detachably connected. When the first mold plate 40 and the base plate 50 are separated, under the action of an external force (such as an opener), the first mold plate 40 drives the second mold plate 30 and the cold material well assembly 80 to move away from the base plate 50. At this time, the cold material 210 in the cold material well 96 and the product 200 are not subjected to external forces between the first mold plate 40 and the second mold plate 30, and are not easy to deform. At this time, the second end 72 of the ejector pin 70 is separated from the cold material 210, and is separated from the insert 82. When the first mold plate 40 and the second mold plate 30 are separated, the slider 81 drives the insert 82 to move in the second direction Y and separate from the cold material 210. At this time, the cold material 210 is completely separated from the ejector pin 70 and the insert 82. At this time, the product 200 is not subjected to the pulling force caused by the cold material 210. Then, the product 200 is ejected. Therefore, in this demolding process, the product 200 will not be subjected to the pulling force caused by the unbalanced force between the cold material 210 (which needs a larger force during demolding) and the product 200. In the present application, the cold material 210 can be collected in the cold material well 96, and the product 200 will not be deformed by the cold material 210 during demolding of the cold material 210 and the product 200, and is easier to demold. On the other hand, the cold material well 96 formed by the combination of the ejector pin 70 and the insert 82 has a gap 814 at the connection between the first groove 73 and the second groove 8212 of the ejector pin 70, which is beneficial for exhaust and also for reducing the impact force of the hot molten plastic at the front end in the high-temperature molten state, which is beneficial for collecting the cold material 210 and reducing the wear of the parts, thereby prolonging the service life of the parts. At the same time, the ejector pin 70 and the insert 82 that constitute the cold material well 96 can be separately disassembled, which is convenient for processing and maintenance.
[0041] Referring to Figure 7 and Figure 8 In some embodiments, the second end 72 has a notch 74, and the notch 74 has a side wall 741 at the notch 74. The notch 74 is arranged in the second direction Y towards the insert 82. The first groove 73 communicates with the notch 74 through the side wall 741. The insert 82 includes an insert block 821, and the second groove 8212 is located on the insert block 821. The insert block 821 has a side surface 8211 that communicates with the second groove 8212. The side surface 8211 is located on the surface of the insert block 821 close to the ejector pin 70 in the second direction Y, and the insert block 821 is located on the notch 74. The side surface 8211 and the side wall 741 are in close contact, and the first groove 73 and the second groove 8212 form the cold material well 96. The insert block 821 is arranged at the notch 74, realizing the detachable connection of the insert block 821 and the ejector pin 70, and enabling the first groove 73 and the second groove 8212 to combine to form the cold material well 96. Such a structure is simple, occupies a small space, and when the cold material 210 is demolded, the demolding can be quickly realized by the separation of the ejector pin 70 and the insert block 821, and the product 200 will not be subjected to a pulling force during demolding.
[0042] Compared with the structure that the cold material well 96 is integrally arranged on the insert 821, the cold material 210 in the cold material well 96 is subjected to the greatest plastic impact force and pressure in the high-temperature molten state, so that the required force for ejecting the product 200 is greater, and the problem of imbalance between the product 200 and the cold material 210 is prone to occur during the ejection of the product 200, which causes the cold material 210 to pull the product 200 and causes the product 200 to be deformed. However, in the embodiment, the cold material well 96 is a split structure, so that the cold material well 96 is separated when the product 200 is ejected, and the cold material 210 is separated and does not generate a pulling force to deform the product 200. In some embodiments, the cold material well 96 is in a cylindrical shape, which facilitates rapid demolding.
[0043] Referring to Figure 7 and Figure 8 In some embodiments, the side surface 8211 and the side wall 741 are both inclined surfaces, and the gap 74 has a bottom wall 742 for abutting the bottom surface of the insert 821. In the first direction X, the side wall 741 is inclined away from the bottom wall 742. By arranging the side surface 8211 of the insert 821 and the side wall 741 of the ejector pin 70 as inclined surfaces, the cold material 210 can be quickly separated from the ejector pin 70 when the first mold plate 40 and the second mold plate 30 are moved away from the base plate 50 in the first direction X during demolding, and the stress generated when the side surface 8211 and the side wall 741 abut or separate is reduced.
[0044] In combination Figure 5 In some embodiments, the insert 821 further has a boss 822 on the top surface thereof, the boss 822 is arranged along the edge of the second groove 8212, and the cold material well 96 and the cavity 95 further have a communication cavity 97, and the boss 822, the second mold plate 30, and the sliding block 81 enclose the communication cavity 97. The cold material well 96 and the cavity 95 are communicated through the communication cavity 97, so that the plastic injected into the cavity 95 through the communication cavity 97 to obtain the product 200.
[0045] Referring to Figure 7 and Figure 8In some embodiments, the insert 82 further comprises a mounting block 823 connected to the insert block 821, the mounting block 823 is connected to the slide block 81 by fasteners, facilitating removable maintenance. The injection mold 100 further comprises a pull block 91 connected to the slide block 81, the pull block 91 is used to drive the slide block 81 to move along the second direction Y when the pull block 91 moves along the first direction X. The pull block 91 is fixedly connected to the second mold plate 30, when the first mold plate 40 and the second mold plate 30 are separated, the pull block 91 moves along the first direction X away from the first mold plate 40, the pull block 91 drives the slide block 81 to move along the second direction Y, thereby driving the insert block 821 to move along the second direction Y, so that the insert block 821 and the cold material 210 are separated. When the first mold plate 40 and the second mold plate 30 are closed, the pull block 91 and the slide block 81 are connected, and the slide block 81 is driven to move along the second direction Y, and the insert block 821 cooperates with the ejector rod 70, so that the first recess 73 and the second recess 8212 combine to form the cold material well 96.
[0046] Referring to Figure 12 In some embodiments, the first block 811 has a receiving groove 816, the insert 82 is arranged in the receiving groove 816 and is fixed in the receiving groove 816 by fasteners.
[0047] Referring to Figure 6 , Figure 9 and Figure 10 In some embodiments, the injection mold 100 further comprises a third mold plate 93 located between the first mold plate 40 and the second mold plate 30. The third mold plate 93 has a first through hole 931, the first mold plate 40 has a second through hole 41, and the ejector rod 70 is sequentially arranged in the second through hole 41 and the first through hole 931 and extends into the cavity 98. The slide block 81 is arranged on the third mold plate 93, and an elastic member 94 is arranged between the third mold plate 93 and the slide block 81. The elastic member 94 is used to drive the slide block 81 to move away from the third mold plate 93 when the pull block 91 moves along the first direction X when the first mold plate 40 and the second mold plate 30 are separated. In some embodiments, the third mold plate 93 is a male mold core. The central axis of the elastic member 94 is arranged along the second direction Y. When the first mold plate 40 and the second mold plate 30 are closed, the elastic member 94 is compressed between the slide block 81 and the third mold plate 93. When the first mold plate 40 and the second mold plate 30 are separated, the pull block 91 moves along the first direction X, the length of the compressed elastic member 94 gradually increases, and the slide block 81 is driven to move, thereby driving the insert block 821 to move away from the cold material 210.
[0048] Referring to Figure 10 and Figure 11In some embodiments, the sliding block 81 comprises a first block 811 and a second block 812 connected with the first block 811, the insert 82 is fixedly connected with the first block 811, and in the first direction X, the second block 812 is protruded from the first block 811, and the elastic member 94 is abutted between the side surface 8211 of the second block 812 and the third mold plate 93.
[0049] The first block 811 is provided with a mounting groove 815 on the side away from the ejector rod 70, the mounting groove 815 penetrates the first block 811 in the first direction X, and an opening of the mounting groove 815 is arranged towards the pull block 91. The mounting groove 815 is substantially in the shape of “U”, and a first protruding block 813 is further protruded on an inner wall of the mounting groove 815, and a gap 814 is left between the first protruding block 813 and the first block 811. The pull block 91 is provided with a second protruding block 92, the second protruding block 92 is arranged in the gap 814, and a surface of the first protruding block 813 facing the second block 812 is in the shape of an inclined surface, so as to drive the first protruding block 813 to move along the second direction Y when the pull block 91 moves along the first direction X. In some embodiments, the side surface 8211 of the sliding block 81 and the inner wall of the mounting groove 815 facing the pull block 91 are both arranged in the shape of an inclined surface, so as to facilitate the installation of the pull block 91 in the mounting groove 815.
[0050] In some embodiments, two first protruding blocks 813 are protruded on the two opposite inner walls of the mounting groove 815, and the pull block 91 is correspondingly provided with two second protruding blocks 92, the two second protruding blocks 92 are arranged at the two end portions of the pull block 91, and the arrangement of the two first protruding blocks 813 facilitates the stability of the sliding block 81 moving along the second direction Y.
[0051] In the injection mold 100 of the present application, the cold material well 96 is formed by the first groove 73 on the ejector rod 70 and the second groove 8212 on the insert 82, and the ejector rod 70 and the insert 82 are detachably connected. Under the action of external force, when the first mold plate 40 and the base plate 50 are separated, at this time the first mold plate 40 drives the second mold plate 30 and the cold material well assembly 80 to move away from the base plate 50, the cold material 210 in the cold material well 96 and the product 200 are not affected by external force, and are not easy to deform, at this time the second end 72 of the ejector rod 70 is separated from the cold material 210, and is separated from the insert 82, when the first mold and the second mold are separated, the slider 81 drives the insert 82 to move along the second direction Y and is separated from the cold material 210, at this time the cold material 210 is completely separated from the ejector rod 70 and the insert 82, at this time the product 200 is also not affected by the pulling force brought by the cold material 210, and the product 200 is subsequently ejected, therefore, in this process, the cold material 210 can be collected in the cold material well 96, and will not deform the product 200 when the cold material 210 and the product 200 are demolded, and is more easy to demold; on the other hand, the cold material well 96 formed by the combination of the ejector rod 70 and the insert 82, the gap 814 at the connection of the first groove 73 and the second groove 8212 of the ejector rod 70 is beneficial to exhaust, and is also beneficial to slow down the impact force of the front end of the hot melt plastic in the high temperature molten state, is beneficial to the collection of the cold material 210 and reduces the wear of the parts, and prolongs the service life of the parts; the ejector rod 70 and the insert 82 constituting the cold material well 96 can be separately disassembled, which is convenient for processing and maintenance.
[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited, although the present application is described in detail with reference to the embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.
Claims
1. An injection mold characterized in that, The injection mold comprises a base plate, a first mold plate, a second mold plate, a top rod, a cold well assembly, and a third mold plate. The first mold plate is arranged on the base plate. The second mold plate is arranged between the first mold plate and the base plate, and a cavity is formed between the first mold plate and the second mold plate. The top rod comprises a first end and a second end arranged oppositely. The first end is fixed on the base plate. The second end is used to penetrate the second mold plate and extend into the cavity.
2. The injection mold of claim 1, wherein, The second end has a first groove.
3. The injection mold of claim 2, wherein, The cold well assembly is arranged in the cavity.
4. The injection mold of claim 3, wherein The cold well assembly comprises a slider and a insert connected with the slider.
5. The injection mold of claim 2, wherein, The insert has a second groove with an opening facing the second mold plate.
6. The injection mold of claim 5, wherein, A mold cavity for forming a product is formed between the slider, the first mold plate and the second mold plate. The insert is mounted on the second end. When the first mold plate and the second mold plate are closed, the first groove and the second groove form a cold well with an opening facing the second mold plate. The cold well is in communication with the mold cavity. When the first mold plate and the base plate are separated, the first mold plate drives the second mold plate to move along the first direction. When the first mold plate and the second mold plate are separated, the slider drives the insert to move along a second direction away from the mold cavity, so that the top rod and the insert are separated. The second end has a notch. The insert comprises an insert block. The second groove is arranged on the insert block. The insert block has a side surface in communication with the second groove. The notch has a side wall. The side surface and the side wall fit to form the cold well. The side surface and the side wall are both inclined surfaces. The notch has a bottom wall. The bottom wall is used to fit with a bottom surface of the insert block. In the first direction, the side wall is inclined away from the bottom wall. A boss is arranged on a top surface of the insert block. The boss is arranged along an edge of the second groove. A communication cavity is arranged between the cold well and the mold cavity. The boss, the second mold plate and the slider form the communication cavity. The insert further comprises a mounting block connected with the insert block. The mounting block is fixedly connected with the slider. The injection mold further comprises a pull block connected with the slider. When moving along the first direction, the pull block drives the slider to move along the second direction. The injection mold further comprises a third mold plate arranged between the first mold plate and the second mold plate. The third mold plate has a first through hole. The top rod is arranged in the first through hole. The slider is arranged on the third mold plate. An elastic member is arranged between the third mold plate and the slider. When the first mold plate and the second mold plate are separated, the pull block moves along the first direction. The elastic member is used to drive the slider to move away from the third mold plate.
7. The injection mold of claim 6, wherein The slider comprises a first block and a second block connected with the first block, the insert is fixedly connected with the first block, in the first direction, the second block is protruded on the first block, the elastic member is abutted between the side surface of the second block and the third mold plate, the upper side surface of the first block is provided with a first protrusion, a gap is left between the first protrusion and the first block, the pull block is provided with a second protrusion, the second protrusion is located in the gap, the surface of the first protrusion facing the second block is a slope, so that the first protrusion is moved along the second direction when the pull block is moved along the first direction.
8. The injection mold of claim 1, wherein, The profile of the cold material well is cylindrical.
9. The injection mold of claim 1, wherein, The slider has a containing groove, and the insert is fixed on the slider through a locking member.
10. The injection mold of claim 1, wherein, The second mold plate is further provided with a hot runner plate, and the hot runner plate is used for conveying molten raw materials into the cavity.