Mold core structure capable of reducing cracks

Abstract

The utility model relates to the technical field of mold injection molding, in particular to a mold core structure capable of reducing cracks. A mold core structure capable of reducing cracks comprises a mold core body, a mold cavity used for forming a product is formed in the mold core body, a parting surface breaking structure is further arranged on the mold core body and is of a cubic structure located at the bottom of the center of the mold cavity, and a stress release groove is formed in the parting surface breaking structure in the length direction of the mold cavity. The stress release groove is a U-shaped groove, a stress release hole which vertically extends downwards is further formed in the center of the stress release groove, the stress release hole is a cylindrical hole, and the extension direction of the stress release groove is perpendicular to that of the stress release hole. When large stress occurs, overlarge stress can be released through deformation, and then the problems that in the prior art, due to injection pressure and thermal expansion and cold contraction, a specific area of the mold core is prone to cracking, the mold repairing cost is increased, and the production efficiency is reduced are solved.

Description

Technical Field

[0001] This utility model relates to the field of mold injection technology, and in particular to a mold core structure that reduces cracking. Background Technology

[0002] The mold core is the core forming component of a mold, directly determining the product's shape, structure, and dimensional accuracy. It is typically made of high-hardness, wear-resistant materials (such as mold steel) and installed within the mold frame, working in conjunction with the mold blank and ejection system to complete the product molding process. During use, the mold core has multiple functional areas, such as a sealing surface to prevent material spillage, a parting surface for easy product separation and demolding, and a contact surface for localized sealing. Figure 1 As shown, the mold core has a mold core body 1 and a parting surface support structure 2 disposed on the mold core body 1. During the injection molding process, the parting surface support structure 2 will bear significant stress. On the one hand, during injection, the molten material fills the mold cavity at high pressure and high speed of 50-200MPa, and the support surface, as a key sealing area, directly bears the instantaneous impact force. On the other hand, the temperature difference between the molten material (e.g., 200-300℃ for plastic) and the mold temperature (usually 60-120℃) is huge. Due to the influence of thermal expansion and contraction, the structure in this area will also be subjected to significant forces. Each time the mold completes an injection-cooling-mold opening cycle, the support surface undergoes a "loading-unloading" process. After long-term operation, micro-cracks gradually expand under alternating stress, eventually leading to macroscopic cracking, resulting in cracks 21 on the mold core. Once the mold core cracks, it must be scrapped and remade, which increases mold repair costs and reduces production efficiency. Utility Model Content

[0003] In view of this, the present invention provides a mold core structure that reduces cracking, in order to solve the problem in the prior art that specific areas of the mold core are prone to cracking due to injection pressure and thermal expansion and contraction, thereby increasing mold repair costs and reducing production efficiency.

[0004] A mold core structure for reducing cracking includes a mold core body with a cavity for molding a product. The mold core body also has a parting surface support structure, which is a cubic structure located at the bottom center of the cavity. A stress relief groove, which is a U-shaped groove, is provided along the length of the cavity on the parting surface support structure. A vertically downward-extending stress relief hole, which is a cylindrical hole, is also provided at the center of the stress relief groove. The extension directions of the stress relief groove and the stress relief hole are perpendicular to each other.

[0005] Furthermore, the axis of the stress relief hole passes through the lowest point of the stress relief hole cross section.

[0006] Furthermore, the diameter of the stress relief hole is larger than the width of the stress relief groove, and a stepped structure is formed at the junction of the stress relief hole and the stress relief groove.

[0007] Furthermore, a reinforcing rib is provided between the parting surface and the bottom surface of the cavity.

[0008] Furthermore, the stress relief groove extends from one side of the parting surface near the broken structure to the other opposite side.

[0009] Furthermore, the stress relief hole extends from the lower end of the stress relief groove to the lower side of the mold core body.

[0010] The beneficial effects of the mold core structure that reduces cracking in this utility model are as follows: This utility model facilitates product molding by setting a mold core body and a cavity located within the mold core body. The basic function of the mold core is easily achieved by setting a parting surface support structure on the mold core body. Since the parting surface support structure is subjected to significant stress during use, leading to cracking and failure, stress relief grooves and vertically downward-extending stress relief holes are provided on the parting surface support structure. Because the extension directions of the stress relief grooves and stress relief holes are perpendicular to each other (i.e., the stress relief grooves are horizontally arranged), the stress relief grooves and stress relief holes provide deformation space for the parting surface support structure. Since they are perpendicular to each other, deformation is possible in two directions. When significant stress occurs, the excessive stress can be released through deformation, thus solving the problem in the prior art where specific areas of the mold core are prone to cracking due to injection pressure and thermal expansion and contraction, thereby increasing mold repair costs and reducing production efficiency. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of a mold core in the prior art;

[0013] Figure 2 This is a schematic diagram of the mold core structure in this utility model;

[0014] Figure 3 This is a cross-sectional view of the mold core structure in this utility model.

[0015] The labels in the diagram represent: 1. Mold core body; 2. Parting surface crack structure; 21. Crack; 3. Stress relief groove; 4. Stress relief hole; 5. Step structure; 6. Reinforcing rib. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the present utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0017] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0018] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0019] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0021] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrating this invention and has no specific meaning in itself. Therefore, "module" and "part" can be used interchangeably.

[0022] To better understand the technical solution of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings.

[0023] In Embodiment 1 of the mold core structure for reducing cracking in this utility model:

[0024] like Figure 2 and Figure 3 As shown, the mold core structure includes a mold core body 1, on which a cavity for molding the product is provided. The two ends of the cavity are semi-circular, and the center is rectangular. A parting line support structure 2 is also provided on the mold core body 1. The parting line support structure 2 is located at the bottom center of the cavity and has a cubic structure. The two sides of the parting line support structure 2 are connected to the two side walls of the cavity, thus dividing the cavity into two parts. During the injection molding process, the parting line support structure 2 is subjected to stress, and cracking is prone to occur at the junction of the parting line support structure 2 and the side walls of the cavity. To release the stress, a stress relief groove 3 is provided on the parting line support structure 2 along the length of the cavity. The stress relief groove 3 has a U-shaped cross-section and extends from one side of the parting line support structure 2 to the other side.

[0025] To further enhance the stress relief effect, a vertically downward-extending stress relief hole 4 is provided at the bottom of the stress relief groove 3. The stress relief hole 4 is a cylindrical hole that extends through to the lower side of the mold core body 1. The upper side of the stress relief hole 4 connects to the stress relief groove 3. The extension directions of the stress relief groove 3 and the stress relief hole 4 are perpendicular to each other, and the axis of the stress relief hole 4 passes through the lowest point of the cross-section of the stress relief hole 4. Thus, when viewed from the side, the stress relief hole 4 and the stress relief groove 3 form a T-shape. In this way, when large stresses are generated in different directions, they can be released through the stress relief groove 3 and the stress relief hole 4, thereby protecting the mold core structure and reducing cracking.

[0026] The opening of the stress relief groove 3 is not closed, thus facilitating stress release through deformation. The stress relief hole 4 is circular, offering greater structural stability than the groove shape. Therefore, the diameter of the stress relief hole 4 is larger than the width of the stress relief groove 3, enhancing stress release capability. Naturally, a stepped structure 5 is formed at the junction of the stress relief hole 4 and the stress relief groove 3. Furthermore, a reinforcing rib 6 is provided between the parting surface support structure 2 and the bottom surface of the cavity to reinforce the parting surface support structure 2.

[0027] Typically, when cracking occurs, the first thought is to strengthen the structure. However, in this invention, stress is released by setting stress relief grooves 3 and stress relief holes 4. Although the structural strength is reduced by opening the holes, the service life of the mold core structure is extended because the stress is no longer concentrated.

[0028] It should be understood that the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A split-reducing core structure, comprising a core body, the core body being provided with a cavity for molding a product, and a parting surface breaking structure, the parting surface breaking structure being a cubic structure located at the center bottom of the cavity, characterized in that: The stress release groove is a U-shaped groove, and a stress release hole extending vertically downward is arranged at the center of the stress release groove.

2. The split-reducing core structure of claim 1, wherein: The axis of the stress release hole passes through the lowest point of the stress release hole section.

3. The split-reducing core structure of claim 1 or 2, wherein: The stress release hole has a hole diameter larger than the groove width of the stress release groove, and a step structure is formed at the junction of the stress release hole and the stress release groove.

4. The split-reducing core structure of claim 1 or 2, wherein: A reinforcing rib is arranged between the parting surface breaking structure and the bottom surface of the cavity.

5. The split reducing core structure of claim 1 or 2, wherein: The stress release groove extends from one side surface of the parting surface breaking structure to the other opposite side surface.

6. The split reducing core structure of claim 1 or 2, wherein: The stress release hole extends from the lower end of the stress release groove to the lower side surface of the mold core body.

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