Cutting mechanism and injection mold

Abstract

The utility model belongs to the technical field of molds, and discloses a cutting mechanism and an injection mold, the cutting mechanism comprises a cutting piece, a driving piece and a driving rod, the cutting piece is arranged in the injection mold in a sliding manner, one end of the cutting piece extends to the joint of a product and a stub bar, and the cutting piece can cut off the product and the stub bar when sliding; the driving part is connected with the driving rod and can drive the driving rod to move in the sliding direction intersecting with the cutting part, the end, away from the driving part, of the driving rod abuts against the cutting part, and the driving rod can push the cutting part to slide in the preset direction when moving. According to the cutting mechanism disclosed by the utility model, after an injection molded product is molded but before the injection molded product is cooled, the cutting piece is driven by the driving piece to cut the joint of the product and the stub bar, the product is in a high-temperature state, is relatively soft and is not easy to crack in the cutting process, then the product is cooled, and finally, the product with tidy cut edges is obtained. And the quality and the yield of injection molding products are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a cutting mechanism and an injection mold. Background Art

[0002] An injection mold is a mold used for injection molding. Injection molding is a method in which a completely molten plastic material is injected into the cavity of the mold under high pressure at a certain temperature, and after cooling and solidifying, a molded product is obtained.

[0003] During the injection molding process, the molten material enters the interior of the mold cavity through the nozzle and gate of the mold. After the molten material in the cavity cools and solidifies, a product is formed, and the molten material in the gate cools and solidifies to form a sprue. The product and the sprue are connected as a whole. After the product is taken out, the sprue part needs to be cut off to obtain the final product.

[0004] However, the hardness of some materials will increase significantly after cooling. For example, for acrylic materials, when cutting the sprue after the acrylic product has cooled, the product is prone to cracking during the cutting process of the sprue. In the light case, the cut of the product is irregular and needs to be polished, repaired, etc. In the severe case, the product is directly scrapped. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a cutting mechanism and an injection mold to cut off the sprue before the product cools, so as to directly obtain the product and improve the quality and yield of the product.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A cutting mechanism, the cutting mechanism is installed on the injection mold and is used for cutting the sprue of the product. The cutting mechanism includes:

[0008] A cutting member, the cutting member is slidably disposed inside the injection mold, one end of the cutting member extends to the connection between the product and the sprue, and when the cutting member slides, it can cut off the product and the sprue;

[0009] A driving member and a driving rod, the driving member is connected to the driving rod, the driving member can drive the driving rod to move along a direction intersecting the sliding direction of the cutting member, one end of the driving rod away from the driving member abuts against the cutting member, and when the driving rod moves, it can push the cutting member to slide along a preset direction.

[0010] Preferably, the driving rod is parallel to the plane formed by the moving direction of the driving member and the sliding direction of the cutting member, and the length direction of the driving member intersects the moving direction of the driving member and the sliding direction of the cutting member. The end of the driving rod away from the driving member slidably penetrates through the cutting member.

[0011] Preferably, the cutting mechanism further includes:

[0012] A cutting seat, which is slidably arranged inside the injection mold. The cutting member is connected to the cutting seat. The sliding direction of the cutting seat is parallel to the sliding direction of the cutting member. The driving rod abuts against the side of the cutting seat away from the cutting member.

[0013] Preferably, the cutting member is arranged in a sheet shape, and the thickness of the end of the cutting member close to the cutting seat is greater than the thickness of the end away from the cutting seat.

[0014] Preferably, a positioning member is detachably connected to the cutting seat. A limiting portion is arranged at the end of the cutting member close to the cutting seat, and the limiting portion abuts between the positioning member and the cutting seat.

[0015] Preferably, a positioning hole is formed in the positioning member. The cutting member passes through the positioning hole, and the end of the cutting member away from the cutting seat extends out of the positioning hole.

[0016] Preferably, the cutting mechanism further includes:

[0017] A guiding member, which is located between the driving member and the driving rod, and there are two guiding members arranged at intervals;

[0018] A sliding block is slidably arranged between the two guiding members. The opposite sides of the sliding block are respectively connected to the driving rod and the driving member.

[0019] Preferably, limiting grooves are arranged on the side of each of the two guiding members close to each other along the sliding direction of the sliding block. Limiting blocks are arranged at the positions corresponding to each limiting groove on the sliding block, and the limiting blocks are slidably matched with the limiting grooves.

[0020] Preferably, an avoidance groove is arranged at the end of the driving rod away from the driving member.

[0021] An injection mold, which includes a moving mold and a fixed mold. The moving mold can be joined with the fixed mold to form a cavity for product molding and a runner for molten material to flow into the cavity. The injection mold further includes a cutting mechanism, and the cutting mechanism is arranged on the moving mold or the fixed mold.

[0022] The beneficial effects of the present utility model:

[0023] For the cutting mechanism of the present utility model, after the injection-molded product is formed and before it is cooled, the driving member drives the driving rod to slide, and the driving rod pushes against the cutting member to slide along a preset direction, so that the cutting member cuts the connection between the product and the sprue, separating the product from the sprue. At this time, the product is in a high-temperature state and is relatively soft, and the product is not likely to break during the cutting process. Then, the product is cooled, and finally a product with neat cut edges is obtained, improving the quality and yield rate of the injection-molded product. In addition, the moving direction of the driving rod intersects the sliding direction of the cutting member, and the driving member and the driving rod can be arranged in a direction intersecting the sliding direction of the cutting member, reducing the space occupied in the sliding direction of the cutting member. Description of the Drawings

[0024] Figure 1 is a schematic structural view of the injection mold of the present utility model;

[0025] Figure 2 is a schematic structural view of the cutting mechanism of the present utility model;

[0026] Figure 3 is an exploded view of the cutting member and the cutting seat of the present utility model;

[0027] Figure 4 is a schematic structural view of the driving member and the driving rod of the present utility model.

[0028] In the figure:

[0029] 1. Cutting member; 11. Limiting part; 12. Edge; 2. Cutting seat; 21. Positioning member; 211. Positioning hole; 3. Driving member; 31. Connector; 4. Driving rod; 41. Avoidance groove; 5. Guide member; 51. Limiting groove; 6. Sliding block; 61. Limiting block; 62. Connecting groove; 7. Fixed mold; 71. Mold core; 711. First runner; 712. First cavity; 8. Ejector plate; 81. Ejector rod. Detailed Description of the Embodiment

[0030] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only parts related to the present utility model are shown in the drawings, rather than all the structures.

[0031] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0033] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] The following refers to Figures 1 to 4 to illustrate the cutting mechanism and the injection mold provided by the present utility model.

[0035] The injection mold includes a movable mold (not shown in the figure), a fixed mold 7, and a cutting mechanism. The movable mold can be joined with the fixed mold 7 to form a cavity for product molding and a runner for molten material to flow into the cavity.

[0036] Exemplarily, the movable mold and the fixed mold 7 in this embodiment are distributed along the vertical direction, and the movable mold is located above the positioning, that is, the closing direction of the injection mold is the vertical direction. The top of the fixed mold 7 is provided with a mold core 71, and the top of the mold core 71 is provided with a first runner 711 and a first cavity 712 that are interconnected. The bottom of the movable mold is provided with a second runner (not shown in the figure) and a second cavity (not shown in the figure) that are interconnected. The movable mold is installed on a driving mechanism (not shown in the figure), and the driving mechanism drives the movable mold to move linearly along the closing direction. When the movable mold and the fixed mold 7 are engaged, the first cavity 712 and the second cavity cooperate to form a cavity for product molding, and the first runner 711 and the second runner cooperate to provide a runner for molten material to flow into the cavity, and a gate connected to the runner is provided on the movable mold. The above-mentioned driving mechanism is any mechanism in the prior art that can drive the movable mold to perform linear motion, such as a cylinder driving mechanism.

[0037] In this embodiment, two cavities are arranged in the horizontal direction, and the two ends of the runner are connected to the two cavities respectively. Two products can be injection molded at a time, that is, after the two products are molded, the material head is located between the two products.

[0038] It should be noted that the movable mold and the fixed mold 7 can also be tilted to a certain extent, or even distributed in the horizontal direction, and the specific angle is not limited.

[0039] Furthermore, an ejector plate 8 is slidably provided at the bottom of the fixed mold 7. The ejector plate 8 is horizontally provided and slides along the mold closing direction of the injection mold. The ejector plate 8 is realized by any component in the prior art that can drive a component to perform linear motion, such as a cylinder, an oil cylinder or an electric cylinder. A plurality of ejector rods 81 are vertically provided on the top of the ejector plate 8. If there are ejector rods 81, they are all slidably provided in the fixed mold 7, and the top ends of some ejector rods 81 extend to the first mold cavity 712, and the top ends of the remaining ejector rods 81 extend to the first runner 711, so that after the product is injection molded, the movable mold and the fixed mold 7 are separated, and the product and the sprue are ejected by the ejector rods 81.

[0040] The cutting mechanism is installed on the movable mold or the fixed mold 7. This embodiment takes the fixed mold 7 as an example, and a cutting mechanism is provided for each connection between the product and the slug. The two cutting mechanisms are arranged opposite to each other. The cutting mechanism is intended to cut the connection between the product and the slug when the product is formed after the injection mold is pressure-maintained, so as to separate the product and the slug, and then cool the product to save the subsequent process of cutting the slug. In order to deal with the problem that hard material products are easy to break after being cut again after forming, and to improve the quality and yield of the product, please refer to the following content for the exemplary structure of the cutting mechanism.

[0041] The cutting mechanism includes a cutting member 1, a cutting seat 2, a driving member 3 and a driving rod 4. The cutting seat 2 is slidably disposed inside the mold core 71. The cutting member 1 is connected to the cutting seat 2. One end of the cutting member 1 away from the cutting seat 2 extends to the connection between the product and the sprue. The cutting member 1 can cut off the connection between the product and the sprue, separating the product from the sprue. The driving member 3 is connected to the stationary mold 7. The driving member 3 can drive the driving rod 4 to move along a direction crossing the sliding direction of the cutting member 1. One end of the driving rod 4 is connected to the driving member 3, and the other end extends into the mold core 71 and abuts against the cutting seat 2. The driving rod 4 can push the cutting member 1 to slide along a preset direction.

[0042] Further, the cutting seat 2 slides along a direction perpendicular to the distribution direction of the product and the sprue. In this embodiment, the product and the sprue are distributed horizontally, that is, the cutting seat 2 slides vertically. The cutting member 1 in this embodiment is arranged in a sheet shape. The cutting member 1 is vertically arranged on the top of the cutting seat 2. The top end of the cutting member 1 extends to one end of the first runner 711 close to the first cavity 712. And one side of the top end of the cutting member 1 close to the first cavity 712 is an edge 12. When the cutting seat 2 drives the cutting member 1 to rise, the edge 12 at the top end of the cutting member 1 can squeeze the connection between the product and the sprue, separating the product from the sprue. The product in this embodiment is arranged in a cylindrical shape. The edge 12 of the cutting member 1 for cutting the sprue is tangent to the surface of the product, so that the surface of the cut product is neater.

[0043] Further, the cutting member 1 is detachably connected to the cutting seat 2. In this embodiment, a positioning member 21 is detachably connected to the cutting seat 2 by bolts. The positioning member 21 is arranged in a block shape. A positioning hole 211 is formed in the positioning member 21. The cutting member 1 passes through the positioning hole 211. And one end of the cutting member 1 away from the cutting seat 2 extends out of the positioning hole 211. And a limiting portion 11 is arranged at one end of the cutting member 1 close to the cutting seat 2. The limiting portion 11 abuts between the positioning member 21 and the cutting seat 2.

[0044] In the above way, the positioning member 21 is sleeved outside the cutting member 1, and the positioning member 21 abuts the limiting portion 11 on the cutting member 1 against the cutting seat 2, so that the cutting member 1 is not easily separated from the positioning member 21, thus realizing the positioning and support of the cutting member 1. After removing the positioning member 21, the cutting member 1 can be replaced. It should be noted that in other alternative embodiments, the cutting member 1 and the cutting seat 2 can also be integrally arranged.

[0045] In addition, the thickness of the end of the cutting member 1 close to the cutting seat 2 is greater than the thickness of the end away from the cutting seat 2, that is, the thickness of the bottom end of the cutting member 1 is greater than the thickness of the top end. By increasing the local thickness of the cutting member 1, the strength of the cutting member 1 can be improved, so that the cutting member 1 is not easily deformed or damaged. In this embodiment, the material of the cutting member 1 is skh51, that is, high-speed steel (HSS), which is a tool steel with high hardness, high wear resistance and high heat resistance, which can improve the strength of the cutting member 1 and extend the service life of the cutting member 1.

[0046] Specifically, the driving member 3 is connected to one side of the fixed mold 7, and the driving member 3 is arranged near the bottom of the fixed mold 7. The driving member 3 is any component in the prior art that can drive an object to perform linear motion, such as a cylinder, an oil cylinder or an electric cylinder. In this embodiment, a cylinder is taken as an example. The cylinder body of the cylinder is connected to the fixed mold 7, and the piston rod of the cylinder moves horizontally and perpendicular to the sliding direction of the cutting seat 2. In other optional embodiments, the driving member 3 and the driving rod 4 can also be arranged inside the mold core 71 by slotting inside the mold core 71, and the specific position is not limited.

[0047] The cutting mechanism further includes a guide member 5, which is located between the cylinder and the die core 71. Two guide members 5 are arranged at intervals, and the two guide members 5 are distributed along the direction perpendicular to the movement direction of the piston rod. A sliding block 6 is slidably arranged between the two guide members 5, and a connecting groove 62 is provided on the side of the sliding block 6 close to the driving member 3. The connecting groove 62 penetrates the sliding block 6 along the sliding direction perpendicular to the sliding block 6, that is, in this embodiment, the connecting groove 62 penetrates the sliding block 6 along the vertical direction.

[0048] In addition, the end of the connecting groove 62 close to the driving member 3 is smaller than the end away from the driving member 3. It can be understood that the connecting groove 62 is T-shaped or trapezoidal. In this embodiment, the connecting groove 62 is in a T-shaped position, and a connecting head 31 is arranged inside the connecting groove 62. The connecting head 31 is adapted to the shape of the connecting groove 62, that is, the connecting head 31 is T-shaped, and the connecting head 31 extends out of the connecting groove 62 and is connected to the piston rod of the cylinder.

[0049] When the piston rod of the cylinder moves, the piston rod and the sliding block 6 are limited along the moving direction of the piston rod due to the cooperation between the connector 31 and the connector groove 62, that is, the piston rod can drive the sliding block 6 to slide synchronously. Since the connector groove 62 is a through groove, the connector 31 can be separated from the sliding block 6 in the vertical direction, so that the piston rod and the sliding block 6 are detachably connected, which is convenient for disassembling and assembling the cylinder.

[0050] Furthermore, one end of the driving rod 4 is connected to the sliding block 6, and a connecting hole is provided on the mold core 71 corresponding to the other end of the driving rod 4, and the other end of the driving rod 4 passes through the connecting hole and then slides through the cutting seat 2. An avoidance groove 41 is provided at the other end of the driving rod 4 so that the driving rod 4 avoids the ejection rod 81 or other components during the sliding process.

[0051] The driving rod 4 is parallel to the plane formed by the moving direction of the piston rod and the sliding direction of the cutting seat 2. The length direction of the driving member 3 intersects the moving direction of the piston rod and the sliding direction of the cutting member 1. It can be understood that in this embodiment, the moving direction of the piston rod is the horizontal direction, and the sliding direction of the cutting seat 2 is the vertical direction and perpendicular to the moving direction of the piston rod, that is, the moving direction of the piston rod and the sliding direction of the cutting seat 2 form a vertical plane, and the driving rod 4 is arranged parallel to this plane. In this embodiment, the driving rod 4 is located within this plane. The other end of the driving rod 4 is inclined upward or downward. In this embodiment, the other end of the driving rod 4 is inclined downward, so that the driving rod 4 intersects the moving direction of the piston rod and the sliding direction of the cutting member 1.

[0052] Based on the above, the driving rod 4 is inclined relative to the sliding direction of the cutting seat 2. When the air cylinder drives the driving rod 4 to slide horizontally in the direction close to the cutting seat 2, since the contact surface between the driving rod 4 and the cutting seat 2 is an inclined surface, the driving rod 4 exerts a thrust on the cutting seat 2 toward the upper side. Since the cutting seat 2 is limited by the mold core 71, the cutting seat 2 can only move in the vertical direction, so as to cut the stock head when the cutting member 1 slides upward in the vertical direction; when the driving rod 4 slides in the reverse direction, the driving rod 4 exerts a thrust on the cutting seat 2 toward the lower side, and the cutting seat 2 drives the cutting member 1 to slide downward to reset. The displacement stroke of the cutting member 1 in this embodiment is 1 mm. By the way of laterally driving the cutting seat 2 to lift and lower through the air cylinder, it is not easy to interfere with components such as the ejector plate 8 at the bottom of the fixed mold 7.

[0053] Optionally, in other embodiments, an inclined surface can also be provided at the bottom of the cutting seat 2, so that during the sliding process of the driving rod 4, the other end of the driving rod 4 pushes against the inclined surface at the bottom of the cutting seat 2, thereby driving the cutting seat 2 to slide upward. When the driving rod 4 resets, the cutting seat 2 resets under its own gravity. An inclined surface can also be provided at the other end of the driving rod 4, or inclined surfaces can be provided at both the bottom of the cutting seat 2 and the other end of the driving rod 4, which can all achieve the purpose of pushing the cutting seat 2 upward.

[0054] Further, limiting grooves 51 are provided on one side of the two guiding members 5 close to each other. The limiting grooves 51 are located on the side of the guiding member 5 close to the fixed mold 7, that is, the limiting grooves 51 are located at the bottom of the guiding member 5. Limiting blocks 61 are connected to the sliding block 6 at positions corresponding to each limiting groove 51. The limiting blocks 61 are slidably matched with the limiting grooves 51, so as to limit the sliding block 6 through the cooperation of the limiting grooves 51 and the limiting blocks 61, so that the sliding block 6 cannot move in the vertical direction and makes the sliding block 6 work more stably.

[0055] Obviously, the above-mentioned embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. Cutting mechanism, which is installed on an injection mold and is used for cutting the sprue of a product, characterized in that The cutting mechanism comprises: A cutting piece (1), the cutting piece (1) being slidably disposed inside the injection mold, one end of the cutting piece (1) extending to the connection between the product and the sprue, and the cutting piece (1) being able to cut off the product and the sprue when sliding; A driving member (3) and a driving rod (4), wherein the driving member (3) is connected to the driving rod (4), and the driving member (3) can drive the driving rod (4) to move along a sliding direction intersecting the cutting member (1); one end of the driving rod (4) away from the driving member (3) abuts against the cutting member (1), and when the driving rod (4) moves, it can push the cutting member (1) to slide along a preset direction.

2. The cutting mechanism according to claim 1, characterized in that, The driving rod (4) is parallel to a plane formed by the moving direction of the driving member (3) and the sliding direction of the cutting member (1), and the length direction of the driving member (3) intersects the moving direction of the driving member (3) and the sliding direction of the cutting member (1), and one end of the driving rod (4) away from the driving member (3) slides through the cutting member (1).

3. The cutting mechanism according to claim 1, wherein The cutting mechanism also includes: A cutting seat (2), wherein the cutting seat (2) is slidably arranged inside the injection mold, the cutting piece (1) is connected to the cutting seat (2), the sliding direction of the cutting seat (2) is parallel to the sliding direction of the cutting piece (1), and the driving rod (4) abuts against a side of the cutting seat (2) away from the cutting piece (1).

4. The cutting mechanism according to claim 3, characterized in that, The cutting piece (1) is arranged in a sheet shape, and the thickness of the end of the cutting piece (1) close to the cutting seat (2) is greater than the thickness of the end away from the cutting seat (2).

5. The cutting mechanism according to claim 3, characterized in that, A positioning member (21) is detachably connected to the cutting seat (2); a limiting portion (11) is provided at one end of the cutting member (1) close to the cutting seat (2); and the limiting portion (11) abuts between the positioning member (21) and the cutting seat (2).

6. The cutting mechanism according to claim 5, wherein The positioning member (21) is provided with a positioning hole (211), the cutting member (1) is arranged through the positioning hole (211), and one end of the cutting member (1) away from the cutting seat (2) extends out of the positioning hole (211).

7. The cutting mechanism according to any one of claims 1-6, characterized in that, The cutting mechanism also includes: A guide member (5), the guide member (5) being located between the driving member (3) and the driving rod (4), and two guide members (5) being arranged at intervals; A sliding block (6) is slidably arranged between the two guide members (5), and opposite sides of the sliding block (6) are respectively connected to the driving rod (4) and the driving member (3).

8. The cutting mechanism according to claim 7, wherein, A limiting groove (51) is provided on the side where the two guide members (5) are close to each other along the sliding direction of the sliding block (6), and a limiting block (61) is provided on the sliding block (6) at a position corresponding to each limiting groove (51), and the limiting block (61) is slidably matched with the limiting groove (51).

9. The cutting mechanism according to any one of claims 1-6, characterized in that An avoidance groove (41) is provided at one end of the driving rod (4) away from the driving member (3).

10. Injection mold, the injection mold comprising a movable mold and a stationary mold (7), the movable mold being capable of engaging with the stationary mold (7) to form a cavity for product molding and a runner for allowing molten material to flow into the cavity, characterized in that, The injection mold further includes a cutting mechanism as described in any one of claims 1-9, and the cutting mechanism is disposed on the moving mold or the stationary mold (7).

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