Plastic mold and method of using the same
By designing the cold slug structure in the plastic mold and utilizing the combination of the extrusion plate and the adjusting rod, the problem of excessive material-workpiece contact area caused by excessively large cold slug well diameter was solved, achieving effective separation of material and workpiece and facilitating subsequent processing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2026-04-10
AI Technical Summary
An excessively large diameter of the cold slug well results in an excessively large contact area between the material inside and the formed workpiece, making it difficult to separate the material from the formed workpiece and affecting subsequent processing.
A plastic mold was designed, including a cold material structure. When the molding cavity is filled with hot-melt material, the cold material structure moves downward to compress and deform the cold material, thereby reducing the contact area between the cold material and the molded workpiece. The material is effectively separated through the cooperation of the extrusion plate and the adjusting rod.
It effectively reduces the contact area between the cold material and the formed workpiece, facilitating the recycling and processing of materials in the later stages and avoiding the leaving of cold material marks.
Smart Images
Figure CN120190968B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of plastic processing, and particularly relates to injection molding, and especially relates to a plastic mold and a use method thereof. BACKGROUND
[0002] In the process of injection molding of a plastic product, the main role of the cold material well is to store the cold material head formed in the early stage of injection due to low temperature, so as to avoid the cold material head from entering the cavity to cause cold material spots, uneven gloss or performance defects on the surface of the product. For example, when the material in a molten state flows through the nozzle or the distribution channel, the cold material is formed due to rapid cooling of the front material, and the cold material well can trap and store the cold material.
[0003] In the related art, the cold material well is usually arranged below the discharge port of the nozzle or the distribution channel, and the material in a molten state in the early stage of injection directly flows into the cold material well to achieve the effect of isolating the cold material.
[0004] However, if the diameter of the cold material well is too large, the contact surface between the material in the cold material well and the workpiece after molding will be too large, which is not conducive to the later processing.
[0005] Therefore, how to solve the problem that the diameter of the cold material well is too large and the material in the cold material well is difficult to separate from the workpiece after molding is a technical problem to be solved in the field.
[0006] It should be noted that the above information disclosed in the background section of the present application is only used to understand the background of the present application, and therefore, the above description is not considered as the information of the related art. SUMMARY
[0007] The present application at least provides a plastic mold and a use method thereof.
[0008] In a first aspect, the present application provides a plastic mold, comprising:
[0009] a lower die arranged on a workbench and fixed with a shaping mold on the upper surface;
[0010] an upper die arranged on the lower die in a lifting manner and forming a shaping cavity when abutting against the lower die;
[0011] a flow channel is arranged on the upper die and communicates with the shaping cavity;
[0012] a cold material structure arranged on the shaping mold in a lifting manner and located below the flow channel;
[0013] When the upper die abuts against the lower die, the cold material structure abuts against the outlet end wall of the flow channel.
[0014] When the material in hot melt state is filled in the shaping cavity, the material pushes the cold material structure to move downward, extruding the cold material in the cold material structure to deform, so as to reduce the contact area between the cold material in the cold material structure and the formed workpiece.
[0015] In an alternative embodiment, the shaping die is provided with a collecting hole in the axial direction, and the cold material structure is arranged in the collecting hole in a lifting manner;
[0016] The upper surface of the shaping die is provided with a positioning groove;
[0017] When the cold material structure is retracted into the positioning groove, the surface of the cold material structure is coplanar with the upper surface of the shaping die.
[0018] In an alternative embodiment, the cold material structure comprises a cold material well arranged in the collecting hole in a lifting manner and protruding from the surface of the shaping die at the upper end;
[0019] A positioning ring is vertically fixed at the upper end of the cold material well;
[0020] The cold material well is provided with two accommodating openings in the radial direction at the position of the positioning ring, and each accommodating opening is hingedly provided with an extrusion piece, and the outer wall of the extrusion piece is in abutment with the inner wall of the collecting hole;
[0021] When the cold material well moves downward, the inner wall of the collecting hole extrudes the extrusion piece to turn inward;
[0022] The two extrusion pieces are synchronously turned inward to extrude the cold material in the cold material well, so as to reduce the contact area between the cold material and the formed workpiece.
[0023] In an alternative embodiment, the outer wall of the extrusion piece is tapered, and the outer diameter of the extrusion piece gradually decreases from the upper end to the lower end.
[0024] In an alternative embodiment, the inclination angle between the tapered surface of the outer wall of the extrusion piece and the horizontal plane is 60-80°.
[0025] In an alternative embodiment, the lower die is provided with a horizontal through hole, and an adjusting rod is slidably arranged in the horizontal through hole, and the adjusting rod is located below the cold material well;
[0026] When the adjusting rod moves horizontally towards the cold material well, the adjusting rod pushes the cold material well to move upward, so as to facilitate demolding.
[0027] In an alternative embodiment, the end of the adjusting rod is provided with an inclined surface, and the horizontal height of the inclined surface gradually decreases from one end close to the adjusting rod to the other end.
[0028] Wherein, the adjusting rod moves to the direction of the cold material well to abut the inclined surface with the bottom wall of the cold material well, and the adjusting rod continues to move, the inclined surface pushes the cold material well and the formed workpiece to move upward to separate from the shaping mold.
[0029] In an alternative embodiment, a protrusion is arranged on the adjusting rod, and a guide surface is arranged on the side wall of the protrusion, the horizontal height of the guide surface gradually increases from one end close to the cold material well to the other end.
[0030] In an alternative embodiment, a cutoff film is arranged on the bottom wall of the cold material well, and the cutoff film is a flexible member.
[0031] Wherein, when the adjusting rod moves to the direction of the cold material well, the protrusion extrudes the cutoff film to deform upward to make the material in the cold material well separate from the cold material well.
[0032] In an alternative embodiment, the thickness of the positioning ring is consistent with the slotting depth of the positioning groove, and the outer diameter is consistent with the inner diameter of the positioning groove.
[0033] In a second aspect, the embodiments of the present disclosure further provide a use method of the plastic mold, and the use method comprises:
[0034] The upper top die moves downward to abut the lower bottom die, and the cold material structure abuts the outlet end wall of the flow channel.
[0035] The cold material structure is suitable for collecting the cold material in the hot melt state in the initial injection stage to avoid the cold material flowing into the shaping cavity.
[0036] When the shaping cavity is filled with the material in the hot melt state, the material pushes the cold material structure to move downward, and the cold material structure extrudes the cold material in the cold material structure to deform when moving downward, so as to reduce the contact area between the cold material in the cold material structure and the formed workpiece.
[0037] The present application has the beneficial effects that the present application provides a plastic mold and a use method thereof, and through the arrangement of the cold material structure, in the process of filling the shaping cavity with the material in the hot melt state and gradually shaping, the cold material structure moves downward to shrink into the collection hole, the inner wall of the collection hole extrudes the two extrusion pieces to turn inward, and the extrusion pieces extrude the material in the cold material well to deform, so as to reduce the contact area between the material and the formed workpiece.
[0038] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and achieved by the structures particularly pointed out in the description and the appended drawings.
[0039] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS
[0040] In order to more clearly illustrate the technical solutions in the specific embodiments or the related art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the related art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.
[0041] Figure 1 A perspective view of the plastic mold in an unfolded state is provided for the embodiments of the present disclosure.
[0042] Figure 2 A cross-sectional perspective view of the plastic mold in an unfolded state is provided for the embodiments of the present disclosure.
[0043] Figure 3 A cross-sectional perspective view of the cold material structure is provided for the embodiments of the present disclosure.
[0044] Figure 4 A partial cross-sectional view of the adjusting rod and the cold material structure is provided for the embodiments of the present disclosure.
[0045] Figure 5 A perspective view of the adjusting rod and the cold material well is provided for the embodiments of the present disclosure.
[0046] Figure 6 A schematic diagram of the deformation state of the material in the cold material well is provided for the embodiments of the present disclosure.
[0047] Figure 7 A schematic diagram of the connection state of the formed workpiece and the material in the cold material well is provided for the embodiments of the present disclosure.
[0048] Figure 8 A schematic diagram of the connection state of the formed workpiece and the material in the cold material well is provided for the embodiments of the present disclosure.
[0049] In the drawings:
[0050] 1, upper top die; 10, shaping cavity; 11, flow channel;
[0051] 2, lower bottom die; 20, shaping mold; 21, collection hole; 22, positioning groove; 23, through hole; 24, adjusting rod; 25, inclined surface; 26, protruding block;
[0052] 3, cold material structure; 31, cold material well; 32, positioning ring; 33, extrusion sheet; 34, cutoff film;
[0053] 4, workpiece; 40, cold material. DETAILED DESCRIPTION
[0054] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.
[0055] In this document, when it is mentioned that a first component is located on a second component, it can mean that the first component can be directly formed on the second component, or a third component can be interposed between the first component and the second component. In addition, in the drawings, in order to effectively describe the technical content, the thickness of the components can be exaggerated or reduced.
[0056] In this document, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of... " when following a list of elements modifies the entire list of elements and not the individual elements of the list. For example, the expression "at least one of a, b, and c" should be understood as including only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.
[0057] The terminology used herein is for the purpose of describing particular example configurations only and is not intended to be limiting. As used herein, the singular articles "a," "an," and "the" can be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order of performance. Additional or alternative steps can be employed.
[0058] As used herein, the phrases "in an embodiment," "according to an embodiment," "in some embodiments," and the like generally mean the particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of the present disclosure. Thus, appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. As used herein, the term "example" or "exemplary" means "serving as an example, instance, or illustration." Any implementation, aspect or design that is described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects or designs. Rather, the term "example" or "exemplary" is intended to present concepts in a concrete manner.
[0059] It is found through research that in the related art, the cold material well is usually arranged below the discharge port of the nozzle or the flow divider, and the material in a hot melt state at the initial stage of injection is directly flowed into the cold material well to achieve the effect of isolating the cold material.
[0060] However, if the diameter of the cold material well is set too large, the contact surface between the material in the cold material well and the formed workpiece will be too large, which is not conducive to the post-processing.
[0061] Therefore, how to solve the problem that the diameter of the cold material well is too large and the material in the cold material well is difficult to separate from the formed workpiece is a technical problem to be solved in the field.
[0062] The defects of the above-mentioned solutions and the causes thereof are the results obtained by the inventors after practice and careful research, and therefore, the discovery process of the above-mentioned problems and the solutions proposed by the present disclosure to solve the above-mentioned problems should be the contributions made by the inventors to the present disclosure in the process of the present disclosure.
[0063] It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.
[0064] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.
[0065] As shown in FIG. 1, the cold material well 1 is arranged below the discharge port of the nozzle 2 or the flow divider 3, and the material in a hot melt state at the initial stage of injection is directly flowed into the cold material well 1 to achieve the effect of isolating the cold material. Figures 1 to 8As shown, at least one embodiment provides a plastic mold, comprising: a lower die 2 arranged on a workbench, and an upper surface fixed with a shaping mold 20; the shaping mold 20 is detachably arranged on the lower die 2, and the shaping mold 20 is shaped according to the shape of the workpiece 4 after forming, so as to adapt to the requirements of different specifications and models of the workpiece 4. An upper die 1 is arranged in a lifting manner on the lower die 2, and forms a shaping cavity 10 when abutting against the lower die 2; an injection port is arranged on the upper die 1, and the injection port is in communication with the flow channel 11, and the material in a hot melt state flows to the shaping cavity 10 through the injection port. The upper die 1 is arranged with a flow channel 11 in communication with the shaping cavity 10; the flow channel 11 is adapted to guide the material in a hot melt state to flow into the shaping cavity 10. A cold material structure 3 is arranged in a lifting manner on the shaping mold 20 and below the flow channel 11; when the upper die 1 abuts against the lower die 2, the cold material structure 3 abuts against the outlet end wall of the flow channel 11; at this time, the cold material structure 3 abuts against the bottom wall of the upper die 1, so as to avoid the cold material flowing into the shaping cavity 10 in the initial stage of injection. In this embodiment, the cold material 40 refers to the material in a hot melt state and at a relatively low temperature, and since the temperature in the flow channel 11 is also relatively low during the injection of the cold material into the flow channel 11, the temperature of the material in a hot melt state is slightly lower than the normal required temperature, and the material in this state cannot be directly used to form the workpiece 4. When the shaping cavity 10 is filled with the material in a hot melt state, the material in the shaping cavity 10 pushes the cold material structure 3 to move downward to extrude the cold material in the cold material structure 3 to deform, so as to reduce the contact area between the cold material in the cold material structure 3 and the workpiece 4 after forming. Through the arrangement of the cold material structure 3, during the process that the shaping cavity 10 is filled with the material in a hot melt state and gradually shaped, the cold material structure 3 moves downward to shrink into the collection hole 21, the inner wall of the collection hole 21 extrudes the two extrusion pieces 33 to turn inward, the extrusion pieces 33 extrude the cold material in the cold material well 31 to deform, so as to reduce the contact area between the cold material and the workpiece 4 after forming. In this embodiment, the material is plastic material recycled from waste, which is classified and cleaned and then melted to form a hot melt state.
[0066] Reference is made to the accompanying drawings Figure 8 In the related art, the diameter of the cold material well 31 is usually 1.5-2 times the diameter of the flow channel 11. The cold material well 31 with a larger diameter can avoid the cold material 40 in the flow channel 11 from flowing into the shaping cavity 10. However, the cold material well 31 with a larger diameter has a larger contact surface with the workpiece 4 after the workpiece 4 is demolded from the shaping mold 20, which is not conducive to the separation of the cold material 40 from the contact surface, and even after the separation, a larger mark is left.
[0067] Reference is made to the accompanying drawings Figure 2, the shaping mold 20 is provided with a collection hole 21 along the axial direction, and the cold material structure 3 is arranged in the collection hole 21 in a lifting manner; when the upper die 1 and the lower die abut against each other to form a mold, the positioning ring 32 of the cold material structure 3 abuts against the outlet end wall of the flow channel 11, at this time, the upper end of the cold material structure 3 protrudes out of the shaping mold 20. The upper surface of the shaping mold 20 is provided with a positioning groove 22; the inner diameter of the positioning groove 22 is greater than the inner diameter of the collection hole 21. Wherein, when the cold material structure 3 is retracted into the positioning groove 22, the surface of the cold material structure 3 is coplanar with the upper surface of the shaping mold 20.
[0068] Reference is made to the accompanying drawings Figure 3 , the cold material structure 3 comprises: a cold material well 31 arranged in the collection hole 21 in a lifting manner, and the upper end of the cold material well 31 protrudes out of the surface of the shaping mold 20; the inner wall of the collection hole 21 is provided with an adjusting groove along the axial direction, the outer wall of the cold material well 31 is provided with a sliding block, the sliding block is arranged in the adjusting groove in a sliding manner, a reset spring is arranged in the adjusting groove, the upper end of the reset spring is fixed on the sliding block, and the reset spring is suitable for pushing the cold material well 31 to move upward. So that the positioning ring 32 can abut against the outlet end wall of the flow channel 11. The positioning ring 32 is vertically fixed on the upper end of the cold material well 31; the thickness of the positioning ring 32 is consistent with the groove depth of the positioning groove 22, and the outer diameter of the positioning ring 32 is consistent with the inner diameter of the positioning groove 22; when the positioning ring 32 and the cold material well 31 are pushed downward by the material in a hot melt state to retract into the collection hole 21, the upper surface of the positioning ring 32 is coplanar with the upper surface of the shaping mold 20, so as to ensure the smoothness of the inner wall of the material in the thermoplastic forming. The cold material well 31 is provided with two accommodating openings along the radial direction at the position of the positioning ring 32, each accommodating opening is hingedly connected with an extrusion piece 33, the extrusion piece 33 is in the shape of a circular arc, the outer wall of the extrusion piece 33 abuts against the inner wall of the collection hole 21; a torsion spring is arranged on the outer wall of the hinged shaft of the extrusion piece 33 and the accommodating opening, and the torsion spring is suitable for pushing the extrusion piece 33 to turn outward. Wherein, when the cold material well 31 moves downward, the inner wall of the collection hole 21 extrudes the extrusion piece 33 to turn inward; the two extrusion pieces 33 synchronously turn inward to extrude the cold material 40 in the cold material well 31 to deform, so as to reduce the contact area between the cold material 40 in the cold material structure 3 and the workpiece 4 after forming.
[0069] Continue to refer to the accompanying drawings Figure 3 , the outer wall of the extrusion piece 33 is in the shape of a cone, and the outer diameter of the extrusion piece 33 gradually decreases from top to bottom. During the process that the cold material well 31 moves downward to retract into the collection hole 21, the inner wall of the collection hole 21 gradually extrudes the two extrusion pieces 33 to synchronously turn inward, and the two extrusion pieces 33 turn inward to gradually extrude the cold material 40 in the cold material well 31 to reduce the outer diameter of the cold material 40, so as to reduce the contact area between the cold material 40 in the cold material well 31 and the workpiece 4 in the shaping cavity 10. Thus, it is more convenient to remove the cold material 40 in the cold material well 31 from the workpiece 4 after forming. Preferably, the included angle between the conical surface of the outer wall of the extrusion piece 33 and the horizontal plane is 60-80°.
[0070] Reference to the accompanying drawings Figure 4 The lower die is provided with a horizontal through hole 23, and an adjusting rod 24 is slidably arranged in the horizontal through hole 23 and located below the cold material well 31. When the adjusting rod 24 moves horizontally towards the cold material well 31, the adjusting rod 24 pushes the cold material well 31 to move upwards, so as to facilitate demolding.
[0071] Reference to the accompanying drawings Figure 5 The end of the adjusting rod 24 is provided with an inclined surface 25, and the horizontal height of the inclined surface 25 gradually decreases from one end close to the adjusting rod 24 to the other end. When the adjusting rod 24 moves towards the cold material well 31 to abut against the bottom wall of the cold material well 31, the adjusting rod 24 continues to move, and the inclined surface 25 pushes the cold material well 31 and the formed workpiece 4 to move upwards to separate from the shaping die 20. The adjusting rod 24 is provided with a protrusion 26, and the side wall of the protrusion 26 is provided with a guide surface, and the horizontal height of the guide surface gradually increases from one end close to the cold material well 31 to the other end. The bottom wall of the cold material well 31 is provided with a cutoff film 34, and the cutoff film 34 is a flexible member. The cutoff film 34 is high-temperature-resistant fluorine rubber (temperature-resistant 320℃, Shore hardness 60A) with a thickness of 1.2mm, and directly contacts the material in a hot melt state. When the adjusting rod 24 moves towards the cold material well 31, the protrusion 26 extrudes the cutoff film 34 to deform upwards, so that the cold material 40 in the cold material well 31 separates from the cold material well 31.
[0072] At least one embodiment provides a use method of a plastic mold, and the use method comprises:
[0073] The upper die 1 moves downwards to abut against the lower die 2, and the cold material structure 3 abuts against the outlet end wall of the flow channel 11.
[0074] The cold material structure 3 is suitable for collecting the material in a hot melt state in the early stage of injection, so as to avoid that the cold material 40 in the early stage of injection flows into the shaping cavity 10.
[0075] When the shaping cavity 10 is filled with the material in a hot melt state, the material pushes the cold material structure 3 to move downwards, and the cold material structure 3 extrudes the cold material 40 in the cold material structure 3 to deform when moving downwards, so as to reduce the contact area between the cold material 40 in the cold material structure 3 and the formed workpiece 4.
[0076] In the description of the embodiments of the present application, unless otherwise clearly defined and limited, the terms “mounting”, “connection”, “connecting” should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0077] In the description of the application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, terms such as "first", "second" and other numerical terms are used herein without implying a sequence or order unless the context clearly indicates otherwise. Therefore, the first element, component, region, layer or section discussed above can be referred to as the second element, component, region, layer or section without departing from the teachings of the example embodiments.
[0078] Based on the above ideal embodiments according to the application, the relevant personnel can make various changes and modifications within the scope of the technical idea of the application according to the above description. The technical scope of the application is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims
1. A plastic mold characterized in that, The utility model relates to a plastic mould which comprises: a lower die (2) arranged on a workbench and having a shaping die (20) fixed on the upper surface thereof; an upper die (1) arranged on the lower die (2) in a lifting manner and forming a shaping cavity (10) when abutting against the lower die (2); a flow channel (11) is formed in the upper die (1) and communicates with the shaping cavity (10); a cold material structure (3) arranged on the shaping die (20) in a lifting manner and located below the flow channel (11); when the upper die (1) abuts against the lower die (2), the cold material structure (3) abuts against the outlet end wall of the flow channel (11); when the shaping cavity (10) is filled with hot melt material, the cold material structure (3) is pushed to move downward by the material, and the cold material (40) in the cold material structure (3) is deformed when the cold material structure (3) moves downward, so as to reduce the contact area between the cold material (40) in the cold material structure (3) and the shaped workpiece (4).
2. The plastic mould of claim 1, wherein: the shaping die (20) is provided with a collecting hole (21) in the axial direction, and the cold material structure (3) is arranged in the collecting hole (21) in a lifting manner; the upper surface of the shaping die (20) is provided with a positioning groove (22); when the cold material structure (3) is retracted into the positioning groove (22), the surface of the cold material structure (3) is coplanar with the upper surface of the shaping die (20).
3. The plastic mould of claim 2, wherein: the cold material structure (3) comprises a cold material well (31) arranged in the collecting hole (21) in a lifting manner and protruding from the surface of the shaping die (20) at the upper end thereof; a positioning ring (32) is fixed vertically on the upper end of the cold material well (31); the cold material well (31) is provided with two accommodating openings in the radial direction near the positioning ring (32), and each accommodating opening is hingedly connected with a pressing piece (33); the outer wall of the pressing piece (33) abuts against the inner wall of the collecting hole (21); when the cold material well (31) moves downward, the inner wall of the collecting hole (21) presses the pressing piece (33) to turn inward; the two pressing pieces (33) are synchronously turned inward to press the cold material (40) in the cold material well (31) to deform, so as to reduce the contact area between the cold material (40) in the cold material well (31) and the shaped workpiece (4).
4. The plastic mould of claim 3, wherein: the outer wall of the pressing piece (33) is tapered, and the outer diameter of the pressing piece (33) gradually decreases from top to bottom.
5. The plastic mould of claim 4, wherein: the inclination angle between the tapered surface of the outer wall of the pressing piece (33) and the horizontal plane is 60-80°.
6. The plastic mould of claim 3, wherein: the lower die (2) is provided with a horizontal through hole (23), and an adjusting rod (24) is arranged in the horizontal through hole (23) in a sliding manner; the adjusting rod (24) is located below the cold material well (31); when the adjusting rod (24) moves horizontally toward the cold material well (31), the adjusting rod (24) pushes the cold material well (31) to move upward, so as to facilitate the demoulding of the shaped workpiece (4) from the shaping die (20).
7. The plastic mold of claim 6, wherein, the end of the adjusting rod (24) is provided with a slope (25), the horizontal height of the slope (25) gradually decreases from one end of the adjusting rod (24) to the other end; wherein, the adjusting rod (24) moves to the direction of the cold material well (31) until the slope (25) abuts against the bottom wall of the cold material well (31), and the adjusting rod (24) continues to move, the slope (25) pushes the cold material well (31) and the shaped workpiece (4) to move upward to separate from the shaping mold (20).
8. The plastic mold of claim 7, wherein, the adjusting rod (24) is provided with a protrusion (26), the side wall of the protrusion (26) is provided with a guide surface, the horizontal height of the guide surface gradually increases from one end of the protrusion (26) to the other end.
9. The plastic mold of claim 8, wherein, the bottom wall of the cold material well (31) is provided with a cutoff film (34), the cutoff film (34) is a flexible member; wherein, when the adjusting rod (24) moves to the direction of the cold material well (31), the protrusion (26) extrudes the cutoff film (34) to deform upward, so that the material in the cold material well (31) separates from the cold material well (31).
10. The plastic mold of claim 3, wherein, the thickness of the positioning ring (32) is consistent with the slotting depth of the positioning groove (22), and the outer diameter is consistent with the inner diameter of the positioning groove (22).
11. A method of using a plastic mold, characterized by, The use method of the plastic mold of any one of claims 1-10 comprises: the upper mold (1) moves downward to abut against the lower mold, and the cold material structure (3) abuts against the outlet end wall of the flow channel (11); the cold material structure (3) is suitable for collecting the cold material (40) in the initial stage of injection, so as to avoid the cold material (40) in the initial stage of injection flowing into the shaping cavity (10); when the shaping cavity (10) is filled with the material in a hot melt state, the material pushes the cold material structure (3) to move downward, and the cold material structure (3) extrudes the cold material (40) in it to deform when moving downward, so as to reduce the contact area between the cold material (40) in the cold material structure (3) and the shaped workpiece (4).
Citation Information
Patent Citations
A mould is moulded to end cover class
CN204701084U
Injection molding apparatus and cap member
US20210260798A1