A top block structure for product upside-down demolding and a demolding method thereof

Abstract

The application discloses a top block structure for product upside-down buckle demolding and a demolding method thereof, which comprises a large top block and a ejection power assembly thereof, a large inclined top and a ejection power assembly thereof, and a small inclined top, wherein the large top block is located above the large inclined top, the small inclined top is between the large top block and the large inclined top, and the small inclined top is opposite to the upside-down buckle position of a product. The bottom of the large top block is fixedly provided with a first guide rail, and the top surface of the small inclined top is provided with a T-shaped sliding groove matched with the first guide rail. The top of the large inclined top is provided with a sliding cavity, a second guide rail is inserted and fixed on the inner bottom surface of the sliding cavity, and the small inclined top is accommodated in the sliding cavity and is provided with a lower sliding groove matched with the second guide rail at the bottom. The outer end of the small inclined top abuts against the upside-down buckle position of the product and is matched with the upside-down buckle position. The application has the advantages of simple structure, reasonable arrangement and high flexibility, is favorable for realizing the demolding treatment of the upside-down buckle of the product, completing the demolding of the whole plastic product, guaranteeing the integrity of the whole product, improving the product quality, and improving the production efficiency of injection molding.

Description

Technical Field

[0001] This invention relates to the field of demolding technology for injection molded products, specifically to a top block structure for undercut demolding of products and a demolding method thereof. Background Technology

[0002] With the rapid development of the plastics industry, all kinds of tools and products used in our daily production and life, from large items like ships and automobiles to small items like screws, buttons, and the casings of various household appliances, are closely related to plastic products. Injection molds are important process equipment for producing various plastic industrial products, and they are also tools that give plastic products their complete structure and precise dimensions. Injection molding is a processing method used for the mass production of certain complex-shaped parts. Specifically, it refers to injecting molten plastic under high pressure into a mold cavity formed by the interlocking of a moving mold and a fixed mold using an injection molding machine. After cooling and solidification, the molded product is obtained. However, depending on the needs of product processing, some plastic products often have undercuts on the inside, as shown in the instruction manual. Figure 1 The product shown has an undercut structure (part A). The molding of the undercut structure often involves a specific structure within the mold to complete the corresponding injection molding. However, this makes the demolding of the molded undercut product more complicated, requiring a more complex demolding structure. This can easily damage the undercut structure, destroy the product surface, affect the quality of the entire plastic product, and consequently affect the efficiency of injection molding. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a top block structure for product undercut demolding and a demolding method thereof.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a top block structure for product undercut demolding, comprising a large top block and its ejection power assembly, a large inclined top and its ejection power assembly, and a small inclined top, wherein the large top block is located above the large inclined top, and the small inclined top is located between the large top block and the large inclined top, directly facing the undercut position on the product. A first guide rail is fixedly installed at the bottom of the large top block, and the top surface of the small inclined top is provided with a T-shaped groove adapted to the first guide rail; the top of the large inclined top is provided with a sliding cavity, and a second guide rail is inserted and fixed on the inner bottom surface of the sliding cavity; the small inclined top is accommodated in the sliding cavity, and its bottom is provided with a downward groove adapted to the second guide rail; the outer end of the small inclined top abuts against the undercut position of the product and is adapted thereto.

[0005] Furthermore, the first guide rail is a T-shaped long slider that slides within a T-shaped groove above the small inclined top.

[0006] Furthermore, the second guide rail has a square column structure, with its top end housed in a downward groove at the bottom of a small sloping top, and the rear end of the downward groove is open.

[0007] Furthermore, the first guide rail is set in a direction that is perpendicular to the second guide rail, and the T-shaped groove on the small inclined top and the lower groove are also set in a direction that is perpendicular to each other.

[0008] Furthermore, there is a relative angle between the setting direction of the second guide rail and the inclined guide post behind the large inclined top, and the angle between the two ranges from 10° to 30°.

[0009] Furthermore, the left side wall of the sliding cavity on the large inclined top is provided with an inwardly recessed movable space, which is directly opposite one end of the T-shaped sliding groove on the small inclined top.

[0010] Furthermore, during injection molding, the top surface of the small inclined ejector is flush with the top surface of the large inclined ejector, the small inclined ejector is embedded in the sliding cavity, and the top surface of the large inclined ejector is in close contact with and sealed to the bottom surface of the large ejector block; the outer end face of the small inclined ejector is flush with the outer end face of the large inclined ejector and the outer end face of the large ejector block.

[0011] The technical solution described in this invention also claims protection for a process method for undercut demolding of a product. Utilizing the aforementioned top block structure for undercut demolding, the method is characterized by: firstly, the large inclined top and the large top block are pushed upwards together in the Z-axis direction. The large inclined top, the small inclined top, and the large top block remain relatively stationary in the Z-axis direction, moving towards the undercut demolding direction. The small inclined top moves vertically upwards synchronously with the large top block under the cooperation of the first guide rail and the T-shaped slide groove. Subsequently, the large inclined top moves obliquely upwards synchronously under the action of the inclined guide post that cooperates with it, moving synchronously with the second guide rail fixed thereto. Due to the relative limiting sliding between the lower slide groove and the second guide rail, the small inclined top moves in the opposite direction of the X-axis along the first guide rail, completing the secondary undercut demolding.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The present invention has a simple structure, reasonable design, and is relatively flexible, which is conducive to realizing the demolding process of the product with the inverted part, completing the demolding of the entire plastic product, ensuring the integrity of the entire product, improving product quality, and increasing the production efficiency of injection molding. Attached Figure Description

[0013] Figure 1 This is a structural diagram of an injection-molded product;

[0014] Figure 2 This is a schematic diagram of the structure of the present invention;

[0015] Figure 3 This is a schematic diagram of the small sloping top structure in this invention;

[0016] Figure 4 This is a schematic diagram of the bottom of the small sloping top in this invention;

[0017] Figure 5This is a bottom structural view of the large top block in this invention;

[0018] Figure 6 This is a diagram showing the fit between the large top block and the small inclined top in this invention;

[0019] Figure 7 This is a schematic diagram of the large sloping roof structure in this invention;

[0020] Figure 8 This is a diagram showing the coordination relationship between the large and small inclined jacks in this invention;

[0021] Figure 9 This is a schematic diagram illustrating the application of the present invention in demolding injection-molded products;

[0022] In the diagram: 1. Injection molded product, 2. Large top block, 3. Large angled top, 4. Small angled top, 21. First guide rail, 31. Second guide rail, 32. Angled guide post, 33. Movement space, 41. T-shaped slide, 42. Lower slide. Detailed Implementation

[0023] It should be noted that in the description of this invention, terms such as "upper", "lower", "left", "right", "front", "rear", "inner side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are only used to facilitate the description of the structural relationship between the components of this invention and do not specifically mean that any component in this invention must have a specific orientation, be constructed and operated in a specific orientation, or be construed as a limitation of this invention.

[0024] Furthermore, the use of terms such as "first" and "second" in the invention is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings:

[0027] like Figures 2 to 8As shown, a top block structure for undercut demolding of a product includes a large top block 2 and its ejection power assembly, a large angled top block 3 and its ejection power assembly, and a small angled top block 4. According to the processing requirements of the injection molding mold, the large top block 2 is located above the large angled top block 3, while the small angled top block 4 is located between the large top block 2 and the large angled top block 3. The front end of the small angled top block 4 faces the undercut position on the injection molded product 1 (e.g., ...). Figure 1 (As shown in section A). The bottom of the large top block 2, on one side corresponding to the undercut position of the product, is fixedly mounted with a first guide rail 21 by countersunk bolts, as shown. Figure 5 As shown in section B, the first guide rail 21 is a T-shaped elongated slider; correspondingly, the top surface of the small inclined top 4 is provided with a T-shaped groove 41 adapted to the first guide rail 21. During product injection molding and demolding, the first guide rail 21 slides within the T-shaped groove 41 on the top surface of the small inclined top. The top of the large inclined top 3, also near the undercut position of the product, is provided with a sliding cavity. The front end of the sliding cavity is open, and a second guide rail 31 is inserted and fixed on its inner bottom surface, such as... Figure 7 As shown in section C, the second guide rail 31 has a flat, square column structure. The top of the second guide rail 31 protrudes from the inner bottom surface of the sliding cavity, and its protrusion height is set according to actual needs. At the same time, there is a relative angle between the length setting direction of the second guide rail 31 and the direction of the inclined guide post 32 that matches the rear side of the large inclined top 3. The angle range of this relative angle is 10° to 30°. The small inclined top 4 is housed in the sliding cavity set on the large inclined top 3. A sliding groove 42 adapted to the second guide rail 31 is provided on the bottom surface of the small inclined top 4. The rear end of the sliding groove 42 is open. The top of the second guide rail 31 is slidably housed in the sliding groove 42. When the mold is closed and the product is injection molded, the top surface of the small inclined top 4 is flush with the top surface of the large inclined top 3, the top surface of the large inclined top 3 is tightly fitted with the bottom surface of the large top block 2, and the front surface of the small inclined top 4 is flush with the front surface of the large inclined top 3 and the front surface of the large top block 2.

[0028] Furthermore, the T-shaped chute 41 and the lower chute 42 are arranged relatively perpendicularly to each other. Correspondingly, the length direction of the first guide rail 21 below the large top block 2 is also relatively perpendicular to the length direction of the second guide rail 31 on the large inclined top 3.

[0029] Combination Figure 8 As shown, for the initial mating position of the first guide rail 21, an inwardly recessed movable space 33 is provided on the left side wall of the sliding cavity on the large inclined top 3. The left side wall of the sliding cavity is parallel to the second guide rail 31. The opening of the movable space 33 is directly opposite one end of the T-shaped slide groove 41 on the small inclined top 4, which facilitates the accommodating installation between the first guide rail 21 and the large inclined top 3 when the mold is closed.

[0030] Reference Figure 9As shown, the above-mentioned top block structure for undercut demolding of products, when applied in an injection mold, corresponds to... Figure 1 The structure of the injection molded product 1 has two sets, symmetrically arranged on the left and right. When the injection molded product 1 needs to be demolded, due to the special undercut structure, firstly, the large inclined ejector 3 and the large ejector block 2 are pushed upward together in the Z-direction along the demolding direction, while the large inclined ejector 3, the small inclined ejector 4, and the large ejector block 2 are relatively stationary in the Z-direction. During the movement towards the undercut demolding direction, the small inclined ejector 4 moves vertically upward synchronously with the large ejector block 2 under the cooperation of the first guide rail 21 and the T-shaped slide 41. At this time, the front end of the small inclined ejector 4 abuts against the undercut position on the product. Subsequently, the large inclined ejector 3, under the action of the rear inclined guide post 32 that cooperates with it... The core-pulling motion is performed synchronously from bottom to top and obliquely upward, while the second guide rail 31 fixed to it moves synchronously. Since the left and right sides of the sliding groove 42 are closely fitted with the second guide rail 31, the two generate relative limiting sliding, thereby driving the small inclined ejector 4 to move backward. At the same time, due to the relative cooperation between the first guide rail 21, which is perpendicular to the second guide rail 31, and the T-shaped sliding groove 41, the small inclined ejector 4 will move in the opposite direction of the X-axis along the first guide rail 21 during the backward movement, completing the secondary demolding of the undercut on the injection molded product 1.

[0031] The structural settings of the large ejector block 2 and the large inclined ejector 3 are set according to the actual processing requirements of the injection molding mold. The structures of the large ejector block and the large inclined ejector in the existing technology can be adopted or referenced. The ejection power components of the large ejector block 2 and the ejection power components of the large inclined ejector 3 can also adopt the relevant settings in the existing technology.

[0032] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A top block structure for undercut demolding of products, characterized in that: The device includes a large top block and its ejection power assembly, a large inclined top and its ejection power assembly, and a small inclined top. The large top block is located above the large inclined top, and the small inclined top is located between the large top block and the large inclined top, directly facing the inverted position on the product. A first guide rail is fixedly installed at the bottom of the large top block, and the top surface of the small inclined top has a T-shaped groove adapted to the first guide rail. The top of the large inclined top has a sliding cavity, and a second guide rail is inserted and fixed on the inner bottom surface of the sliding cavity. The small inclined top is housed in the sliding cavity, and its bottom has a downward groove adapted to the second guide rail. The outer end of the small inclined top abuts against the inverted position of the product and is adapted to it. The first guide rail is set in a direction that is perpendicular to the second guide rail, and the T-shaped groove on the small inclined top and the lower groove are also set in a direction that is perpendicular to the lower groove.

2. The top block structure for undercut demolding of a product according to claim 1, characterized in that: The first guide rail is a T-shaped long slider that slides within a T-shaped groove above the small inclined top.

3. The top block structure for undercut demolding of a product according to claim 1, characterized in that: The second guide rail has a square column structure, with its top end housed in a downward groove at the bottom of a small sloping top, and the rear end of the downward groove is open.

4. The top block structure for undercut demolding of a product according to claim 1, characterized in that: The second guide rail is set at a relative angle to the inclined guide post behind the large inclined top, and the angle between the two ranges from 10° to 30°.

5. The top block structure for undercut demolding of a product according to claim 1, characterized in that: The left side wall of the sliding cavity on the large inclined top has an inwardly recessed movable space, which is directly opposite one end of the T-shaped sliding groove on the small inclined top.

6. The top block structure for undercut demolding of a product according to claim 1, characterized in that: During injection molding, the top surface of the small inclined ejector is flush with the top surface of the large inclined ejector, the small inclined ejector is embedded in the sliding cavity, and the top surface of the large inclined ejector is in close contact with the bottom surface of the large ejector block; the outer end surface of the small inclined ejector is flush with the outer end surface of the large inclined ejector and the outer end surface of the large ejector block.

7. A process for undercut demolding of a product, utilizing a top block structure for undercut demolding of a product as described in any one of claims 1 to 6, characterized in that: First, the large angled ejector and the large ejector block push upwards together in the Z-axis. The large angled ejector, the small angled ejector, and the large ejector block remain relatively stationary in the Z-axis and move in the direction of undercut demolding. The small angled ejector moves vertically upwards synchronously with the large ejector block under the action of the first guide rail and the T-shaped slide. Then, the large angled ejector moves diagonally upwards synchronously under the action of the angled guide post that cooperates with it, and moves synchronously with the second guide rail that is fixed to it. Due to the relative limiting sliding between the lower slide and the second guide rail, the small angled ejector moves in the opposite direction of the X-axis along the first guide rail, completing the secondary demolding of the undercut.

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