A device for cutting a rubber port

Abstract

The utility model provides a kind of to cut glue port device, mould and punch cutting mechanism, the mould is equipped with injection cavity, and pouring piece and product are formed by injection in injection cavity, the pouring piece includes connecting portion, and the connecting portion is connected with product;The punch cutting mechanism extends to the mould inside and cuts, the punch cutting mechanism includes upper and lower symmetrical cutter one and cutter two, the blade of cutter one and cutter two is aligned with the connecting portion of product and pouring piece and is cut, and smooth cutting surface is formed, after the product after cutting is taken out, the pouring piece continues to be placed in the injection cavity and carries out next injection, saves injection material, using upper and lower symmetrical cutter one and cutter two synchronous punch design, significantly improve cutting surface flatness and product yield rate, simultaneously, after the product after cutting is taken out, pouring piece is located in injection cavity so that pouring piece can be recycled and utilized, reduce production cost.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding technology, specifically relating to a device for cutting the glue nozzle. Background Technology

[0002] In actual production, during injection molding, the gate serves as a crucial channel for molten plastic to flow from the injection molding machine's runner into the mold cavity. Its design and removal process directly impact the molding quality and production efficiency of the injection-molded part. After injection molding, the plastic at the gate solidifies and connects with the injection-molded part, forming a semi-finished injection-molded product that needs to be removed along the gate cutting line.

[0003] Traditional gate removal devices rely on manual operation to remove the gate, which is prone to burrs, gaps, or accidental cutting of the injection molded part due to deviations in force or angle, severely reducing product appearance consistency and yield. Some automated punching equipment uses a single-sided blade to apply force, and the asymmetrical force during the shearing process causes the cutting surface to tilt and burrs to remain. At the same time, the stress concentration on one side accelerates the wear of the blade, requiring frequent blade replacement and increasing maintenance costs. In addition, the traditional punching process, due to the rough cutting surface or unreasonable connection structure design, is prone to tearing or damage when the casting part is separated from the injection molded part, making it difficult to reuse the casting part and causing material waste. Utility Model Content

[0004] (1) Technical problems to be solved

[0005] This invention provides a gate cutting device, which aims to solve the problems of low cutting accuracy and low recovery rate of gate cutting devices.

[0006] (2) Technical solution

[0007] This utility model provides a device for cutting the injection port, including a mold core and a punching mechanism. The mold core is provided with an injection cavity, and a casting part and a product are formed by injection molding in the injection cavity. The casting part includes a connecting part, and the connecting part is connected to the product.

[0008] The punching mechanism extends into the mold core to perform cutting. The punching mechanism includes a first cutter and a second cutter arranged symmetrically on the upper and lower sides. The cutting edges of the first cutter and the second cutter are aligned with the connection between the product and the casting to cut, forming a smooth cutting surface. After the product is cut, it is taken out and the casting is placed in the injection cavity for the next injection molding, thus saving injection molding materials.

[0009] Furthermore, the cross-section of the connecting part is a trapezoidal structure, and the width L1 near the end of the product is smaller than the width L2 away from the end of the product.

[0010] Furthermore, the second cutter includes a bent surface, and the connecting part is provided with an inclined groove adapted to the bent surface.

[0011] Furthermore, the second cutter also includes a straight surface.

[0012] Furthermore, the bent surface includes a first inclined surface and a second inclined surface, and the first inclined surface is connected to the straight surface to form an inclination angle.

[0013] Furthermore, the extended surface of the inclined plane two and the extended surface of the straight plane form an inclination angle two, and the inclination angle one is greater than the inclination angle two.

[0014] Furthermore, the punching direction of the punching mechanism is perpendicular to the central axis P1 of the product.

[0015] Furthermore, the casting part is provided with a through groove, and the product is formed in the through groove.

[0016] Furthermore, there are two connecting parts, and the number of punching mechanisms corresponds to the number of connecting parts.

[0017] Furthermore, the first cutter and the second cutter are made of cemented carbide material, and their surfaces can be coated with a wear-resistant coating.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. The design adopts a symmetrical upper and lower cutting blade one and cutting blade two with synchronous counter-punching. By applying force symmetrically, the shearing torque problem of traditional single-sided blades is eliminated, and the cutting force is evenly distributed. This avoids slanted cuts, burr residue, and stress concentration on one side, which significantly improves the flatness of the cut surface and the product yield. At the same time, after the cut product is removed, the casting part is located in the injection cavity, which makes the casting part recyclable and reduces production costs.

[0020] 2. The cutter features an innovative straight-face design that provides vertical shearing force at the punching end, ensuring complete separation of the product from the casting. It also restrains material springback, solving the problems of residual uncut material and cut warping associated with traditional V-shaped cutters. This results in a smooth, burr-free cut surface, ensuring the integrity of the casting and improving the recycling rate. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0022] Figure 2 This is a schematic diagram showing the connection between the casting component and the product of this utility model.

[0023] Figure 3 This is a top view showing the connection between the casting component and the product according to this utility model.

[0024] Figure 4 This is a front sectional view of the overall structure of this utility model.

[0025] Figure 5 This is a front sectional view of the cutter of this utility model.

[0026] Figure 6 This is a schematic diagram of the punched casting part of this utility model.

[0027] Figure 7 This is a schematic diagram of the punched product of this utility model.

[0028] Reference numerals: 1-casting part, 11-through groove, 12-connecting part, 13-cutting surface, 121-sloping groove, 122-trapezoidal structure, 2-punching mechanism, 21-cutter one, 22-cutter two, 221-bending surface, 2211-sloping surface one, 2212-sloping surface two, 222-straight surface, 223-tilt angle one, 224-tilt angle two, 23-drive mechanism, 3-product, 4-mold core, 41-injection cavity. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0030] like Figure 1 As shown, this utility model provides a cutting device for injection molding, including a mold core 4 and a punching mechanism 2. The mold core 4 is provided with an injection cavity 41, in which a casting part 1 and a product 3 are injection molded. The casting part 1 includes a connecting part 12, which is connected to the product 3.

[0031] The punching mechanism 2 extends into the mold core 4 to perform cutting. The punching mechanism 2 includes a first cutter 21 and a second cutter 22 arranged symmetrically on the upper and lower sides. The cutting edges of the first cutter 21 and the second cutter 22 are aligned with the connection between the product 3 and the casting part 1 to cut, forming a smooth cutting surface 13. After the product 3 is cut, it is taken out and the casting part 1 is placed in the injection cavity 41 for the next injection molding, saving injection molding materials.

[0032] It also includes a drive mechanism 23, which drives the first cutter 21 and / or the second cutter 22 to move to the connecting part 12, separating the product 3 from the casting part 1. By synchronously counteracting, it eliminates the situation in traditional designs where the cutting surface 13 is tilted or has residual burrs due to the force on one side when using a single-sided cutter. It avoids secondary processing, ensures uniform distribution of cutting force, avoids stress concentration on one side, and results in a high yield of the product 3 after cutting, while the surface of the casting part 1 is smooth and flat. At the same time, since the casting part 1 can continue to be placed in the injection cavity 41 for the next injection after the product 3 is removed, it solves the problem in the traditional process where the gate connected to the product 3 is cut to the next injection gate and needs to be re-injected, resulting in resource waste. It realizes closed-loop utilization, reduces resource consumption, and greatly reduces production costs.

[0033] Specifically, as shown in Figure 2 and Figure 3 shown, the casting part 1 includes a connecting part 12. The connecting part 12 is connected to the product 3. The cross-section of the connecting part 12 is a trapezoidal structure 122. The width L1 at one end close to the product 3 is smaller than the width L2 at one end far from the product 3, that is, L1 < L2. By designing with a smaller width near the product 3, the stress is dispersed along the inclined plane during punching, avoiding stress concentration, reducing tearing or burrs on the cutting surface 13, improving the cutting flatness. The tapered trapezoidal structure 122 guides the upper and lower corresponding cutter 1 21 and cutter 2 22 to synchronously align with the narrowest part of the connecting part 12, ensuring the accuracy of the incision position, avoiding residues or inclinations caused by position deviations. At the same time, the wider L2 end is conducive to the molten material flowing from the casting part 1 to the product 3 during injection molding, reducing the flow resistance, avoiding insufficient filling or shrinkage marks, and improving the molding quality.

[0034] Specifically, as shown in Figure 2 shown, a through groove 11 is provided on the casting part 1. The product 3 is formed in the through groove 11 for the punching mechanism 2 to insert and abut against the connection part between the casting part 1 and the product 3, facilitating the better separation of the casting part 1 and the product 3.

[0035] Furthermore, as shown in Figure 4 shown, the punching direction of the punching mechanism 2 is perpendicular to the central axis P1 of the product 3. When the punching direction is perpendicular to the central axis P1 of the product 3, the punching forces of the upper and lower cutter 1 21 and cutter 2 22 are evenly distributed along the symmetry axis of the product 3, reducing the situation that the material is subjected to shear torque due to the unilateral tool force applied by the traditional oblique punching, the oblique punching generates lateral component forces, resulting in material offset, the cutting surface 13 is prone to inclination, additional positioning compensation is required, and the stress is concentrated on one side of the incision, and the tool is prone to wear. In this application, by using double tools to apply force synchronously, the shear force is symmetric, the cutting surface 13 is smooth, the cutter 1 21 and the cutter 2 22 are evenly stressed, and the wear rate is reduced. The lateral component forces are eliminated. Under the perpendicular punching direction, the punching force is completely used for material shearing without interference from lateral component forces.

[0036] Specifically, as shown in Figure 5 shown, the cutter 2 22 includes a straight surface 222. During use, the straight surface 222 provides a vertical shearing force at the end of punching, ensuring the complete separation of the product 3 and the casting part 1. At the same time, by setting the straight surface 222, the rebound of the product 3 is restricted at the moment of cutting, avoiding warping or burrs at the incision edge, solving the situation that some materials are not completely sheared and remain and the incision edge warps during punching with the traditional V-shaped double inclined plane tool. By designing the straight surface 222, the cutting surface 13 of the casting part 1 and the product 3 is complete and smooth, enabling the casting part 1 to be recycled and reused, and at the same time improving the yield rate of the product 3.

[0037] Furthermore, the second cutter 22 includes a bent surface 221, and the connecting part 12 is provided with a slanted groove 121 adapted to the bent surface 221. The slanted groove 121 is inverted L-shaped, which reduces the area of ​​the connection between the connecting part 12 and the integrally formed product 3, making it easier for the punching mechanism 2 to punch. At the same time, it avoids the bent surface 221 of the second cutter 22 from colliding with the connecting part 12 during the punching process, preventing damage to the casting 1 and making it unusable. This method improves the recycling rate of the casting 1, thereby saving production costs and improving work efficiency.

[0038] Specifically, such as Figure 5 As shown, the bending surface 221 includes a first inclined surface 2211 and a second inclined surface 2212. The first inclined surface 2211 connects with the straight surface 222 to form an inclination angle 223. The extension line of the second inclined surface 2212 and the extension line of the straight surface 222 form an inclination angle 224. The first inclination angle 223 is greater than the second inclination angle 224. The large angle of the first inclined surface 223 reduces the initial contact area, concentrates pressure to break through the shear strength of the material surface, and the more inclined angle 223 allows for rapid cutting into the connecting part 12 and the product 3, shortening the material stress time and avoiding plastic deformation. The cut edges are warped, and the large-angle bevel ensures stable material breaking even under high-frequency operation, avoiding tool jamming caused by material accumulation. Meanwhile, the small-angle bevel of angle 224 increases the cross-sectional area of ​​the cutting edge, improves bending stiffness, and avoids chipping caused by stress concentration. The relatively gentle bevel 2212 provides continuous lateral support in the middle and later stages of cutting, suppressing material rebound or tearing. The first bevel 223 is responsible for "breakthrough-fast cutting" and reduces cutting energy consumption, while the second bevel 224 is responsible for "stabilization-fine finishing" and improves the quality of the cross-section. This makes the first cutter 21 and the second cutter 22 have greater bending strength and reduces the occurrence of chipping.

[0039] Preferably, such as Figure 6-7 As shown, there are two connecting parts 12. The number of punching mechanisms 2 corresponds to the number of connecting parts 12. By cutting in parallel at two stations, two connecting parts 12 can be separated in a single punching, which improves efficiency. By punching synchronously with the two punching mechanisms 2, the lateral torque caused by punching on one side is offset, which improves the stability of the system. The product 3 is separated from the connecting part 12 by the punching fastener 3, and the product 3 is detached to form a separate casting part 1 and product 3.

[0040] Preferably, the first cutter 21 and the second cutter 22 are made of cemented carbide material, and their surfaces can be coated with a wear-resistant coating. By combining the high hardness of the cemented carbide with the wear resistance of the coating, the chipping rate of the cutting edge is reduced. Furthermore, the coating reduces adhesion to the molten plastic, keeping the cutting clean and ensuring that the cut surface 13 is flat and smooth. This ensures that the casting part 1 is smooth and recyclable, while also ensuring a high yield of product 3.

[0041] The following is a detailed explanation of the working principle of this utility model;

[0042] In use, the punching mechanism 2 moves towards the connection between the casting 1 and the product 3 under the drive of the driving component. The symmetrically designed cutter 1 21 and cutter 22 simultaneously punch and separate the product 3 from the casting 1. The separated product 3 is taken out, while the casting 1 remains in the injection cavity 1 for the next injection molding, realizing the reusability of the casting 1. At the same time, the cutter is configured with a straight surface 222 and a bent surface 221. The bent surface 221 includes a first inclined surface 2211 and a second inclined surface 2212. An inclination angle 1 223 is provided between the first inclined surface 2211 and the straight surface 222. The second inclined surface 2212 is extended to form an inclination angle 224 with the straight surface 222. The inclination angle 1 223 is 223. 23 is greater than the second tilt angle 224. The large angle of the first tilt angle 223 reduces the initial contact area and concentrates the pressure to break through the shear strength of the material surface. The more inclined tilt angle 223 can quickly cut into the connecting part 12 and the product 3, shorten the material stress time, and avoid the warping of the cut edge caused by plastic deformation. At the same time, the second tilt angle 224 is a small angle, which increases the cross-sectional area of ​​the cutting edge, improves the bending stiffness, and avoids the chipping caused by stress concentration. This results in a high yield of the cut product 3, while the surface of the casting part 1 is smooth and flat. Moreover, the casting part 1 can be recycled and reused to achieve closed-loop utilization, reduce resource consumption, and greatly reduce production costs.

[0043] The innovation of this utility model lies in the use of a symmetrical upper and lower cutter blade one and cutter blade two with synchronous counter-punching design. By applying force symmetrically, the shearing torque problem of traditional single-sided cutters is eliminated, and the cutting force is evenly distributed. This avoids slanted cuts, burr residue, and stress concentration on one side, significantly improving the flatness of the cut surface and the product yield. At the same time, after the product is removed, the casting part is placed in the injection cavity, making the casting part reusable and reducing production costs. The innovative design of cutter blade two is straight, providing vertical shearing force at the punching end to ensure complete separation of the product and the casting part, while restraining material springback. This solves the problems of uncut material residue and cut warping of traditional V-shaped cutters, achieving a smooth and burr-free cut surface.

[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

[0045] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A cutting gum port device, comprising: The device includes a mold core (4) and a punching mechanism (2). The mold core (4) has an injection cavity (41) in which a casting part (1) and a product (3) are formed by injection molding. The casting part (1) includes a connecting part (12) which is connected to the product (3). The punching mechanism (2) extends into the mold core (4) to perform cutting. The punching mechanism (2) includes a first cutter (21) and a second cutter (22) arranged symmetrically on the top and bottom. The cutting edges of the first cutter (21) and the second cutter (22) are aligned with the connection between the product (3) and the casting part (1) to cut and form a smooth cutting surface (13). After the product (3) is cut, the casting part (1) is placed in the injection cavity (41) for the next injection molding, thus saving injection molding materials.

2. The apparatus of claim 1, wherein: The cross-section of the connecting part (12) is a trapezoidal structure (122), and the width L1 of the end closer to the product (3) is smaller than the width L2 of the end farther away from the product (3).

3. The apparatus of claim 2, wherein: The second cutter (22) includes a bent surface (221), and the connecting part (12) is provided with a slanted groove (121) that is adapted to the bent surface (221).

4. The apparatus of claim 3, wherein the cutting edge is formed by a plurality of cutting edges. The second cutter (22) also includes a straight surface (222).

5. The apparatus of claim 4 wherein, The bent surface (221) includes a first inclined surface (2211) and a second inclined surface (2212), and the first inclined surface (2211) is connected to the straight surface (222) to form an inclination angle (223).

6. The apparatus of claim 5 wherein, The extended surface of the inclined plane two (2212) and the extended surface of the straight plane (222) form an inclination angle two (224), and the inclination angle one (223) is greater than the inclination angle two (224).

7. The apparatus of claim 1 wherein, The punching direction of the punching mechanism (2) is perpendicular to the central axis P1 of the product (3).

8. The apparatus of claim 7 wherein, The casting part (1) is provided with a through groove (11), and the product (3) is formed in the through groove (11).

9. The apparatus of claim 7 wherein, There are two connecting parts (12), and the number of punching mechanisms (2) corresponds to the number of connecting parts (12).

10. The apparatus of claim 1 wherein, The first cutter (21) and the second cutter (22) are made of cemented carbide material, and their surfaces can be coated with a wear-resistant coating.

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