Injection mold

Abstract

The present invention provides an injection mold, which includes a front mold and a rear mold. The front mold has a front parting surface, and a cavity groove is formed on the front parting surface. The rear mold can approach or separate from the front mold. The rear mold has a rear parting surface disposed opposite to the front parting surface, and the rear parting surface is attached to the front parting surface to close the cavity groove to form a cavity. Wherein, a clearance is provided between the front parting surface and the rear parting surface, and the clearance is communicated with the opening of the cavity groove and is arranged around the cavity groove. The technical solution of this application can avoid the problem of drawing caused by the pressing injury of the product due to the mating and breaking of the injection mold.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding, and particularly relates to an injection mold. Background Art

[0002] An injection mold is a tool for producing plastic products, including a front mold and a rear mold that can be opened and closed. When the rear mold and the front mold are closed, a product cavity consistent with the product structure is formed between the rear mold and the front mold. The parting surfaces where the front mold and the rear mold are in contact with each other have a certain roughness, which is similar to a sawtooth or wave shape microscopically. When the front and rear molds are closed and abutted, extrusion will occur, causing pressure injuries and swelling points at the opening of the cavity on the parting surface. At this time, when the product is demolded from the cavity opening, it will cause scratches on the product surface at the cavity opening. Especially for some mirror products, the scratch defects are more obvious. Summary of the Invention

[0003] The main object of the present invention is to provide an injection mold, aiming to avoid the scratch problem caused by the pressure injury of the injection mold during mold closing and abutting.

[0004] To achieve the above object, an injection mold proposed by the present invention includes:

[0005] A front mold, the front mold has a front parting surface, and a cavity groove is opened on the front parting surface; and

[0006] A rear mold, the rear mold can approach or move away from the front mold, the rear mold has a rear parting surface opposite to the front parting surface, and the rear parting surface is attached to the front parting surface to close the cavity groove to form a cavity;

[0007] Wherein, a clearance is provided between the front parting surface and the rear parting surface, and the clearance is communicated with the opening of the cavity groove and is arranged around the cavity groove.

[0008] In an embodiment of the present application, the cross-section of the clearance is rectangular.

[0009] In an embodiment of the present application, the depth h of the clearance in the depth direction of the cavity groove satisfies 0.0035 mm ≤ h ≤ 0.0065 mm.

[0010] In an embodiment of the present application, the width d of the clearance in the width direction of the cavity groove satisfies 0.5 mm ≤ d ≤ 1 mm.

[0011] In an embodiment of the present application, the clearance is opened on the front parting surface.

[0012] In an embodiment of the present application, the clearance is opened on the rear parting surface.

[0013] In an embodiment of the present application, a first relief groove is provided on the front parting surface, and the first relief groove is arranged around the circumferential side of the cavity groove and communicates with the cavity groove;

[0014] A second relief groove is provided on the rear parting surface, and the second relief groove is arranged around the circumferential side of the cavity groove and is arranged opposite to the first relief groove to enclose the clearance with the first relief groove.

[0015] In an embodiment of the present application, the roughness of the front parting surface satisfies Ra ≤ 0.3 μm and Rz ≤ 3 μm;

[0016] And / or, the roughness of the rear parting surface satisfies Ra ≤ 0.3 μm and Rz ≤ 3 μm.

[0017] In an embodiment of the present application, a forming protrusion is convexly provided on the rear parting surface. When the front mold and the rear mold are closed, the forming protrusion is inserted into the cavity groove and is spaced from the groove wall of the cavity groove to form the cavity.

[0018] In an embodiment of the present application, the roughness of the groove wall of the cavity groove satisfies Ra ≤ 0.3 μm and Rz ≤ 3 μm.

[0019] The technical solution of the present invention is to provide a clearance arranged around the cavity between the front parting surface and the rear parting surface of the injection mold, so that the circumferential side of the opening of the cavity groove on the front parting surface will not be squeezed when the front mold and the rear mold are closed and abutted, and there will be no bruising caused by squeezing, thus avoiding the problem of bruising and swelling points at the opening of the cavity groove and scratching the product when the product is demolded. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0021] Figure 1 It is a structural diagram when the injection mold of the present invention is closed in an embodiment;

[0022] Figure 2 is Figure 1 a structural diagram when the injection mold is split in.

[0023] Explanation of the reference numerals in the drawings:

[0024] Label Name Label Name 100 Injection mold 33 Forming protrusion 10 Front mold 50 Clearance 11 Front parting surface 51 First relief groove 13 Cavity groove 53 Second relief groove 30 Rear mold 200 Product 31 Rear parting surface

[0025] The realization, functional features, and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with embodiments. Specific Embodiments

[0026] 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 making creative efforts fall within the protection scope of the present invention.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back,...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0028] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0029] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0030] The present invention provides an injection mold 100.

[0031] Please refer to Figure 1 , in some embodiments of the injection mold 100 of the present application, the injection mold 100 includes:

[0032] A front mold 10, the front mold 10 has a front parting surface 11, and a cavity groove 13 is formed on the front parting surface 11; and

[0033] The rear mold 30 can approach or move away from the front mold 10. The rear mold 30 has a rear parting surface 31 disposed opposite to the front parting surface 11. The rear parting surface 31 is attached to the front parting surface 11 to close the cavity groove 13 to form a cavity.

[0034] Wherein, a clearance 50 is provided between the front parting surface 11 and the rear parting surface 31. The clearance 50 is communicated with the opening of the cavity groove 13 and is arranged around the cavity groove 13.

[0035] Specifically, the injection mold 100 is generally composed of two parts, namely, the front mold 10 and the rear mold 30, which can approach and separate from each other. One of the front mold 10 and the rear mold 30 can be installed on the moving template of the injection equipment to form a moving mold, and the other of the front mold 10 and the rear mold 30 can be installed on the fixed template of the injection equipment to form a fixed mold. The fixed mold remains fixed, and the injection mold 100 is clamped and unclamped by driving the moving mold to approach and separate from the fixed mold. When injection molding, the front mold 10 and the rear mold 30 are closed to form a gating system and a cavity. When the mold is opened, the front mold 10 and the rear mold 30 are separated to take out the plastic product. In this embodiment, the front mold 10 and the rear mold 30 have a front parting surface 11 and a rear parting surface 31 that can be mutually attached. Among them, a cavity groove 13 for injection molding is provided on the front parting surface 11. When the front mold 10 and the rear mold 30 are clamped, the front parting surface 11 and the rear parting surface 31 are mutually attached to close the cavity groove 13 to form a cavity. After injection molding and the product 200 is solidified, the front mold 10 and the rear mold 30 are separated, and the product 200 can be taken out from the cavity groove 13. Since both the front parting surface 11 and the rear parting surface 31 have a certain roughness, no matter which process is used to polish the front parting surface 11 and the rear parting surface 31, the front parting surface 11 and the rear parting surface 31 both present a serrated or wavy shape when observed microscopically. At this time, when the front mold 10 and the rear mold 30 are clamped, the front parting surface 11 and the rear parting surface 31 will be mutually extruded, resulting in bruising of the serrated or wavy shape. Moreover, at the opening edge of the cavity groove 13, it is easier to cause bruising bumps to protrude into the cavity groove 13. At this time, when the product 200 is demolded from the opening of the cavity groove 13, it will cause scratches on the surface of the product 200 at the cavity opening. Especially for some mirror products 200, the scratch defects are more obvious. In this embodiment, an air clearance 50 surrounding the cavity is provided between the front parting surface 11 and the rear parting surface 31. The air clearance 50 can be provided on the front parting surface 11, or on the rear parting surface 31, or on both the front parting surface 11 and the rear parting surface 31 at the same time, which is not limited here. The air clearance 50 is located outside the opening of the cavity groove 13, communicates with the opening of the cavity groove 13, and is arranged around the opening of the cavity groove 13. With such an arrangement, when the front mold 10 and the rear mold 30 are clamped, the opening edge of the cavity groove 13 will not be extruded. It can be understood that when the air clearance 50 is provided on the rear parting surface 31, the rear parting surface 31 will not press on the opening edge of the cavity groove 13, and thus no bruising bumps will be generated. When the air clearance 50 is provided on the front parting surface 11, there is no position on the opening edge of the cavity groove 13 that can be extruded to generate bruising bumps, so that it is possible to avoid the existence of bruising bumps at the opening of the cavity groove 13, which may cause scratches on the product 200 during demolding of the product 200.

[0036] In addition, the setting of the clearance 50 can provide a clearance space for the cavity. For example, it can be used for exhaust when injecting materials into the cavity, enabling the materials to fully fill the cavity space, thereby ensuring a well-filled and high-quality product 200 and avoiding deformation of the product 200 caused by insufficient material filling.

[0037] Therefore, it can be understood that in the technical solution of the present invention, by arranging the clearance 50 around the cavity between the front parting surface 11 and the rear parting surface 31 of the injection mold 100, when the front mold 10 and the rear mold 30 are closed and abutted, the circumferential side of the opening of the cavity groove 13 on the front parting surface 11 will not be squeezed, and there will be no bruising caused by squeezing. Thus, the problem of scratching the product 200 during the demolding of the product 200 due to the generation of bruised swelling points at the opening of the cavity groove 13 is avoided.

[0038] Please refer to Figure 1 , in some embodiments of the present application, the cross-section of the clearance 50 is rectangular.

[0039] It can be understood that in the technical solution of the foregoing embodiment, by arranging the clearance 50 in the injection mold 100, it is possible to avoid scratching the surface of the product 200 during the demolding of the product 200 due to bruising at the opening of the cavity groove 13. In this embodiment, the shape of the clearance 50 is set to be rectangular. With this setting, it is convenient to open the clearance 50 and reduce the processing difficulty of the injection mold 100.

[0040] Please refer to Figure 1 , in some embodiments of the present application, the depth h of the clearance 50 in the depth direction of the cavity groove 13 satisfies 0.0035 mm ≤ h ≤ 0.0065 mm.

[0041] It can be understood that for the technical solution of the present application, in order to avoid scratching the surface of the product 200 during demolding due to indentation at the opening of the cavity groove 13, and to ensure that the clearance 50 actually covers the opening edge of the cavity groove 13, so that the clearance 50 communicates with the cavity groove 13 when the injection mold 100 is closed. In this embodiment, the depth h of the clearance 50 in the depth direction of the cavity groove 13 satisfies 0.0035 mm ≤ h ≤ 0.0065 mm. At this time, h can be 0.0035 mm, 0.004 mm, 0.0045 mm, 0.005 mm, 0.0055 mm, 0.006 mm, 0.0065 mm, and any value between 0.0035 mm and 0.0065 mm, which is not limited here; if h is less than 0.0035 mm, the depth of the clearance 50 is too small, and there is still a problem of indentation and swelling at the edge of the cavity groove 13 during mold closing. If h exceeds 0.0065 mm, at this time, there may be a problem that the material enters the clearance 50 space during the injection process, resulting in abnormalities such as burrs at the edge of the product 200 after molding, which requires reprocessing after demolding, affecting the processing efficiency and yield of the product 200. Making the depth of the clearance 50 between 0.0035 mm and 0.0065 mm can ensure that the depth of the clearance 50 is sufficient to play a good clearance role, avoid indentation at the opening of the cavity groove 13, and avoid the depth of the clearance 50 being too deep. Generally speaking, the injection melt has a certain fluidity. When the depth of the clearance 50 is less than 0.0065 mm, the melt cannot flow into the clearance 50, thereby avoiding the generation of abnormalities such as burrs or protrusions at the edge of the product 200 and improving the injection yield of the product 200.

[0042] Please refer to Figure 1 , in some embodiments of the present application, the width d of the clearance 50 in the width direction of the cavity groove 13 satisfies 0.5 mm ≤ d ≤ 1 mm.

[0043] Similarly, in this embodiment, the width d of the clearance 50 in the width direction of the cavity groove 13 is made to satisfy 0.5 mm ≤ d ≤ 1 mm. At this time, d can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, and any value between 0.5 mm and 1 mm, which is not limited here; if the width of the clearance 50 is less than 0.5 mm, there is still a problem of indentation and swelling at the edge of the cavity groove 13 during mold closing; if the width of the clearance 50 is greater than 1 mm, the width of the clearance 50 is too large, which easily leads to the problem that the material enters the clearance 50 space during the injection process, resulting in abnormalities such as burrs at the edge of the product 200 after molding, which requires reprocessing after demolding, affecting the processing efficiency and yield of the product 200. In this embodiment, the width of the clearance 50 is between 0.5 mm and 1 mm to ensure that the clearance 50 is sufficient to play a good clearance role and avoid indentation at the opening of the cavity groove 13.

[0044] Please refer to Figure 2 , in some embodiments of the present application, the clearance 50 is formed on the front parting surface 11.

[0045] It can be understood that, in the technical solution of the present application, in order to avoid the surface of the product 200 being scratched when the product 200 is demolded due to indentation at the opening of the cavity groove 13, a clearance 50 is provided around the cavity in the injection mold 100. In this embodiment, the clearance 50 is formed on the front parting surface 11, so that the clearance 50 is formed outside the cavity groove 13 and communicates with the cavity groove 13. With such a setting, there is no position at the opening edge of the cavity groove 13 that can be squeezed to generate indentation bumps, so that it is possible to avoid the opening of the cavity groove 13 having indentation bumps that cause the product 200 to be scratched when the product 200 is demolded.

[0046] Please refer to Figure 2 , in some embodiments of the present application, the clearance 50 is formed on the rear parting surface 31.

[0047] In this embodiment, the clearance 50 is formed on the rear parting surface 31 to form an annular clearance groove. When the front mold 10 and the rear mold 30 are closed, the clearance groove is arranged opposite to the edge of the cavity opening. With such a setting, there is no position on the rear parting surface 31 that can press on the opening edge of the cavity groove 13, and thus no indentation bumps will be generated at the edge of the cavity opening. In some embodiments, the clearance groove on the rear parting surface 31 can be formed at a certain distance inside the cavity opening to avoid the edge of the clearance groove and the edge of the cavity opening from being squeezed.

[0048] Please refer to Figure 2 , in some embodiments of the present application, the front parting surface 11 is provided with a first clearance groove 51, and the first clearance groove 51 is arranged around the circumference of the cavity groove 13 and communicates with the cavity groove 13;

[0049] The rear parting surface 31 is provided with a second clearance groove 53, and the second clearance groove 53 is arranged around the circumference of the cavity groove 13 and is arranged opposite to the first clearance groove 51 to enclose the clearance 50 with the first clearance groove 51.

[0050] In this embodiment, a first relief groove 51 and a second relief groove 53 are respectively formed on the front parting surface 11 and the rear parting surface 31, so that both the first relief groove 51 and the second relief groove 53 are arranged to surround the circumferential direction of the cavity groove 13, and when the front mold 10 and the rear mold 30 are closed, the first relief groove 51 and the second relief groove 53 are docked with each other to form the aforementioned clearance 50. With such a setting, there is no structure on the front parting surface 11 that can be extruded and deformed at the opening edge of the cavity groove 13, and the rear parting surface 31 will not squeeze the opening edge position of the cavity groove 13 either, so that it is possible to effectively avoid the opening edge of the cavity groove 13 from being extruded to produce bruised bumps, and further effectively avoid the product 200 from being scratched when demolded.

[0051] In an embodiment of the present application, the roughness of the front parting surface 11 satisfies Ra≤0.3μm and Rz≤3μm;

[0052] And / or, the roughness of the rear parting surface 31 satisfies Ra≤0.3μm and Rz≤3μm.

[0053] It can be understood that since both the front parting surface 11 and the rear parting surface 31 have a certain roughness, no matter which process is used to polish the front parting surface 11 and the rear parting surface 31, the front parting surface 11 and the rear parting surface 31 both present a serrated or wavy shape when observed microscopically. At this time, when the front mold 10 and the rear mold 30 are closed, the front parting surface 11 and the rear parting surface 31 will squeeze each other, resulting in bruises on the serrated or wavy shape. And at the opening edge of the cavity groove 13, it is easier to cause bruised bumps to protrude into the cavity groove 13. At this time, when the product 200 is demolded from the opening of the cavity groove 13, it will cause scratches on the surface of the product 200 at the cavity opening. In this embodiment, making the roughness of the front parting surface 11 satisfy Ra≤0.3μm and Rz≤3μm means making the front parting surface 11 as smooth and flat as possible, reducing the size of the serrations or wavy lines, and reducing the risk of bruised bumps.

[0054] In addition, making the roughness of the rear parting surface 31 satisfy Ra≤0.3μm and Rz≤3μm makes both the front parting surface 11 and the rear parting surface 31 maintain good smoothness and flatness, so that the front parting surface 11 and the rear parting surface 31 fit better when the front mold 10 and the rear mold 30 are closed, reducing the risk of bruised bumps and improving the injection molding quality of the product 200.

[0055] Please refer to Figure 1 , in some embodiments of the present application, the rear parting surface 31 is convexly provided with a forming protrusion 33, and when the front mold 10 and the rear mold 30 are closed, the forming protrusion 33 is inserted into the cavity groove 13 and is spaced from the groove wall of the cavity groove 13 to form the cavity.

[0056] It can be understood that when the current mold and the rear mold 30 are closed, a cavity for injecting the product 200 is formed. In this embodiment, the rear parting surface 31 is convexly provided with a forming protrusion 33. When the front mold 10 and the rear mold 30 are closed, the forming protrusion 33 is inserted into the cavity groove 13 and encloses a cavity with the groove wall of the cavity groove 13. At this time, the forming protrusion 33 and the groove wall of the cavity groove 13 can be set according to the shape of the product 200 to be formed, so that the product 200 formed after injection molding is formed according to the cavity shape, and the product 200 is integrally injection molded.

[0057] In an embodiment of the present application, the surface roughness of the groove wall of the cavity groove 13 satisfies Ra≤0.3μm and Rz≤3μm.

[0058] It can be understood that the injection mold 100 proposed in the present application is mainly used for injecting plastic products 200. In this embodiment, the surface roughness of the groove wall of the cavity groove 13 satisfies Ra≤0.3μm and Rz≤3μm. At this time, the outer surface of the plastic product 200 formed by injecting through the injection mold 100 of the present application has good smoothness, and a surface effect similar to a mirror can be formed, improving the injection molding quality of the product 200; at this time, it can be better seen whether there are scratches on the surface of the product 200, and it can be judged whether there is a problem of indentation at the edge of the cavity opening, so as to make improvements in time.

[0059] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An injection mold, characterized in that, Comprising: A front mold, the front mold having a front parting surface, and a cavity groove being provided on the front parting surface; And A rear mold, the rear mold being capable of approaching or separating from the front mold, the rear mold having a rear parting surface disposed opposite to the front parting surface, and the rear parting surface being attached to the front parting surface to close the cavity groove to form a cavity; Wherein, a first relief groove is provided on the front parting surface, the first relief groove being disposed around the periphery of the cavity groove and communicating with the cavity groove; A second relief groove is provided on the rear parting surface, the second relief groove being disposed around the periphery of the cavity groove and being disposed opposite to the first relief groove to enclose a clearance with the first relief groove, the clearance communicating with the opening of the cavity groove and being disposed around the cavity groove, the depth h of the clearance in the depth direction of the cavity groove satisfies 0.0035 mm ≤ h ≤ 0.0065 mm; the cross-section of the clearance is rectangular, and the width d of the clearance in the width direction of the cavity groove satisfies 0.5 mm ≤ d ≤ 1 mm.

2. The injection mold according to claim 1, wherein The roughness of the front parting surface satisfies Ra ≤ 0.3 μm and Rz ≤ 3 μm; And / or, the roughness of the rear parting surface satisfies Ra ≤ 0.3 μm and Rz ≤ 3 μm.

3. The injection mold according to claim 1, wherein The rear parting surface protrudes with a forming protrusion, and when the front mold and the rear mold are closed, the forming protrusion is inserted into the cavity groove and is spaced from the groove wall of the cavity groove to form the cavity.

4. The injection mold according to any one of claims 1 to 3, characterized in that, The roughness of the groove wall of the cavity groove satisfies Ra ≤ 0.3 μm and Rz ≤ 3 μm.

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