Inverted buckle discharging structure of injection mold

Abstract

The utility model discloses an injection mold inverted buckle forming structure, which comprises a front mold, a rear mold, a slide, a fixed seat, a guide block and a shoveling machine, the front mold and the rear mold can be mutually combined and separated, the slide is arranged on the front mold in a sliding manner, the fixed seat is fixed on the rear mold, and when the front mold and the rear mold are mutually combined, the guide block is fixed on the fixed seat. An injection molding cavity is defined between the slide and the fixed seat, the injection molding cavity is provided with an inverted buckling structure, the slide is used for forming the inverted buckling structure of the injection molding cavity, the shoveling machine is arranged on the side part of the fixed seat, the guide block is fixed on the side part of the slide, the shoveling machine is provided with a first inclined surface, and the guide block is fixed on the side part of the slide. The guide block is provided with a second inclined face, and the first inclined face abuts against the second inclined face. The technical scheme is used for solving the problems of complex structure and low mold opening efficiency in the existing front mold core-pulling technology for removing the inverted buckle.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, specifically relating to an undercut structure for injection molds. Background Technology

[0002] In modern manufacturing, especially for the production of small products, minimizing manufacturing costs, shortening injection molding cycles, and maximizing production efficiency have always been important goals that the industry continuously explores and pursues. Due to their size limitations, optimization at any stage of the design and production process for small products can significantly impact overall economic benefits.

[0003] Currently, the most common method for demolding products with undercut structures in the front mold is the front mold core-pulling method. However, this traditional front mold core-pulling technique has several drawbacks in practical applications. First, it requires complex equipment and numerous components, significantly increasing manufacturing costs. For example, it requires four additional spring pins, springs, and a locking mechanism, and the panel thickness is also relatively thick, all contributing to increased production costs. Second, from a production process perspective, the existing mold-opening process is cumbersome, requiring two steps: first, the panel and A-plate are opened to pull the front mold core out of the undercut; after opening to a certain distance, the locking mechanism holds the core in place before the A and B plates are opened. This undoubtedly increases the injection molding cycle and reduces production efficiency. Furthermore, in terms of equipment maintenance and replacement, the complex structure and numerous components increase the difficulty of operation, making maintenance and replacement relatively troublesome, further affecting the continuity and timeliness of production. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an injection mold undercut structure to solve the problems of complex structure and low mold opening efficiency in existing undercut front mold core pulling technology. This injection mold undercut structure effectively reduces manufacturing costs, shortens the injection molding cycle, and significantly improves production efficiency while ensuring normal mold release.

[0005] This utility model discloses an undercut structure for an injection mold, including a front mold, a rear mold, a slide, a fixed seat, a guide block, and a scraper. The front mold and the rear mold can be combined and separated. The slide is slidably disposed on the front mold, and the fixed seat is fixed on the rear mold. When the front mold and the rear mold are combined, an injection cavity is formed between the slide and the fixed seat. The injection cavity has an undercut structure, and the slide is used to form the undercut structure of the injection cavity. The scraper is disposed on the side of the fixed seat, and the guide block is fixed on the side of the slide. The scraper has a first inclined surface, and the guide block has a second inclined surface. The first inclined surface and the second inclined surface abut against each other. When the front mold and the rear mold are separated, the guide block and the scraper slide relative to each other through the cooperation of the first inclined surface and the second inclined surface. The guide block drives the slide to slide out of the undercut structure.

[0006] Furthermore, the guide block has a T-shaped cross-section, and correspondingly, the shovel is provided with a T-shaped groove.

[0007] Furthermore, the fixing seat is provided with an injection flow channel, which is connected to the injection cavity.

[0008] Furthermore, a spring is provided on the side of the slide that is away from the guide block, and the spring abuts against the slide and the front mold respectively.

[0009] Furthermore, it also includes a limiting block, which is fixed to the front mold. When the front mold and the rear mold are separated, the slide abuts against the limiting block.

[0010] Furthermore, a wear-resistant block is provided at the position where the slide contacts the front mold.

[0011] Compared to existing undercutting technologies such as core pulling from the front mold, this invention eliminates the complex core pulling mechanism and additional components (such as spring pins and locking mechanisms) of traditional technologies by sliding the slide in the front mold, fixing the base to the rear mold, and utilizing a structure design that combines a shovel and a guide block with inclined surfaces. When the mold opens and closes, the front and rear molds separate, and the guide block and shovel slide relative to each other through the inclined surfaces, causing the slide to slide out of the undercut structure, achieving undercut demolding in a single mold opening. This structure simplifies the overall mold construction, reduces manufacturing processes, and lowers manufacturing costs. Simultaneously, since no complex secondary mold opening operation is required, the injection molding cycle is significantly shortened, and production efficiency is significantly improved. Furthermore, the simple structural design makes mold maintenance and component replacement more convenient, reducing equipment maintenance difficulty and costs, and ensuring the continuity and stability of production. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0013] Figure 1 This is a schematic diagram of an injection mold with an undercut structure in the mold-closed state.

[0014] Figure 2 This is a schematic diagram of an injection mold with an undercut structure in the mold-opening state.

[0015] Figure 3 This is a schematic diagram of the working structure of the sliding block, guide block, and shovel. Detailed Implementation

[0016] This utility model discloses an undercut structure for injection molds. This undercut structure for injection molds effectively reduces manufacturing costs, shortens the injection cycle, and significantly improves production efficiency while ensuring normal mold ejection.

[0017] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, what is described is only a part of the embodiments of this utility model, and not all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0018] See Figures 1-3 As shown, this utility model discloses an undercut structure for an injection mold, including a front mold 1, a rear mold 2, a slide 2, a fixed base 8, a guide block 5, and a scraper 9. The front mold 1 and the rear mold 2 can be combined and separated from each other. The slide 2 is slidably disposed on the front mold 1, and the fixed base 8 is fixed on the rear mold 2. When the front mold 1 and the rear mold 2 are combined, the slide 2 and the fixed base 8 enclose an injection cavity 7. The injection cavity 7 has an undercut structure, and the slide 2 is used to form the injection cavity. The undercut structure of the plastic cavity 7 includes a shovel 9 located on the side of the fixed base 8 and a guide block 5 fixed to the side of the slide 2. The shovel 9 has a first inclined surface 11, and the guide block 5 has a second inclined surface 10. The first inclined surface 11 and the second inclined surface 10 abut against each other. When the front mold 1 and the rear mold 2 separate from each other, the guide block 5 and the shovel 9 slide relative to each other through the cooperation of the first inclined surface 11 and the second inclined surface 10. The guide block 5 drives the slide 2 to slide out of the undercut structure.

[0019] Compared to existing undercutting technologies such as core pulling in the front mold 1, this invention eliminates the complex core pulling mechanism and additional components (such as spring pins and locking mechanisms) of traditional technologies by sliding the slide 2 on the front mold 1, fixing the fixed seat 8 to the rear mold 2, and utilizing the inclined surface cooperation between the shovel 9 and the guide block 5. When the mold opens and closes, the front mold 1 and the rear mold 2 separate, and the guide block 5 and the shovel 9 slide relative to each other through the inclined surface cooperation, driving the slide 2 to slide out of the undercutting structure, achieving undercut demolding in a single mold opening. This structure simplifies the overall mold construction, reduces manufacturing processes, and lowers manufacturing costs. At the same time, since there is no need for complex secondary mold opening operations, the injection molding cycle is significantly shortened, and production efficiency is significantly improved. In addition, the simple structural design makes mold maintenance and component replacement more convenient, reducing equipment maintenance difficulty and costs, and ensuring the continuity and stability of production.

[0020] The guide block 5 has a T-shaped cross section, and correspondingly, the shovel 9 is provided with a T-shaped groove.

[0021] The T-shaped groove design of the forklift 9 provides a larger contact area and a tighter, more stable fit compared to a standard planar fit. During mold opening, the T-shaped fit can withstand greater lateral forces, effectively preventing misalignment or jamming between the guide block 5 and the forklift 9 during relative sliding. This ensures that the slide block 2 can smoothly slide out of the undercut structure along a predetermined trajectory. This stable fit not only improves the reliability of mold opening and closing actions and reduces mold failures and debugging time caused by unstable fits, but also extends the overall service life of the mold, reduces repair and replacement costs due to mold damage, and further enhances production efficiency and product quality stability.

[0022] The fixed base 8 is provided with an injection flow channel, which is connected to the injection cavity 7.

[0023] An injection runner connected to the injection cavity 7 is provided in the fixed base 8. Compared to the complex runner layouts or additional runner components required in existing technologies, this design allows the molten plastic to flow more directly and smoothly into the injection cavity 7 during injection molding. The simplified runner structure reduces pressure loss and energy consumption during melt flow, contributing to improved injection molding efficiency and quality. Simultaneously, since the runner is directly located within the fixed base 8, additional runner processing and assembly steps are reduced, lowering mold manufacturing costs. Furthermore, the simple runner structure facilitates mold cleaning and maintenance, effectively reducing production interruptions caused by runner blockages and residual material, ensuring efficient production.

[0024] A spring is provided on the side of the slide 2 away from the guide block 5, and the spring abuts against the slide 2 and the front mold 1 respectively.

[0025] During mold opening, the spring force assists the guide block 5 and the shovel 9 in coordinating to push the slide 2 out of the undercut structure more quickly and smoothly, avoiding impact on mold opening efficiency due to slide 2 jamming. During mold closing, the spring absorbs the impact force when slide 2 resets, reducing collision and wear between slide 2 and other components, thus protecting mold parts. Compared with existing technologies that may lack auxiliary power or buffer structures, this design improves the stability and reliability of slide 2's movement, reduces the frequency of mold repair and replacement due to component wear, extends mold life, and also helps improve product molding accuracy and quality, reducing the generation of defective products.

[0026] The injection mold undercut structure also includes a limiting block 6, which is fixed to the front mold 1. When the front mold 1 and the rear mold 2 are separated, the slide 2 abuts against the limiting block 6.

[0027] When the mold opens, slide 2 slides to abut against limit block 6, which precisely limits the movement distance of slide 2, preventing it from sliding excessively and deviating from the predetermined trajectory or colliding with other components. This ensures the accuracy and safety of slide 2's disengagement from the undercut structure. Compared to existing technologies that may rely on other unstable limiting methods or lack a clear limiting structure, the limit block 6 design of this invention improves the controllability and stability of the mold opening and closing process, reducing mold failures and product quality problems caused by uncontrolled movement of slide 2. At the same time, the limit block 6 has a simple structure and is easy to install, facilitating inspection and adjustment during mold maintenance and debugging, reducing equipment maintenance difficulty and costs, and ensuring the smooth operation of the production process.

[0028] A wear-resistant block 4 is provided at the position where the slide 2 contacts the front mold 1.

[0029] A wear-resistant block 4 is installed at the contact point between the slide 2 and the front mold 1, effectively solving the problem of severe wear caused by frequent friction between the slide 2 and the front mold 1 in the prior art. The installation of the wear-resistant block 4 significantly reduces the coefficient of friction between the slide 2 and the front mold 1, reducing the degree of wear on the components and thus extending the service life of the slide 2 and the front mold 1. Compared with the traditional technology that does not install the wear-resistant block 4 or adopts other wear-resistant measures, the replacement of the wear-resistant block 4 of the present invention is simpler and less costly, without the need to replace the entire slide 2 or the front mold 1, greatly reducing the maintenance cost of the mold; at the same time, it reduces the production downtime caused by component wear, improves the utilization rate and production efficiency of the equipment, and ensures the continuity and stability of production.

[0030] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications or substitutions should be considered within the protection scope of the present invention.

Claims

1. An injection mold ejection undercut structure, characterized by, The injection molding machine comprises a front mold, a rear mold, a moving part, a fixed base, a guide block and a shoveling machine. The front mold and the rear mold can be combined and separated. The moving part is slidably arranged on the front mold. The fixed base is fixed on the rear mold. When the front mold and the rear mold are combined, an injection cavity is formed between the moving part and the fixed base. The injection cavity has an undercut structure, and the moving part is used to form the undercut structure. The shoveling machine is arranged on the side of the fixed base. The guide block is fixed on the side of the moving part. The shoveling machine is provided with a first inclined surface, and the guide block is provided with a second inclined surface. The first inclined surface and the second inclined surface are in abutment. When the front mold and the rear mold are separated, the guide block and the shoveling machine slide relative to each other through the first inclined surface and the second inclined surface. The guide block drives the moving part to slide out of the undercut structure.

2. The undercut structure of an injection mold according to claim 1, wherein The cross section of the guide block is T-shaped. Correspondingly, a T-shaped groove is arranged on the shoveling machine.

3. The undercut structure of claim 1, wherein, An injection flow channel is arranged in the fixed base, and the injection flow channel is communicated with the injection cavity.

4. The undercut structure of claim 1, wherein, A spring is arranged on the side of the moving part away from the guide block. The spring abuts against the moving part and the front mold respectively.

5. The undercut structure of claim 1, wherein, A limiting block is further arranged. The limiting block is fixed on the front mold. When the front mold and the rear mold are separated, the moving part abuts against the limiting block.

6. The undercut structure of claim 1, wherein, A wear-resistant block is arranged at the position where the moving part contacts the front mold.

Images