A one-shot head in-mold cutting mechanism for a two-color mold and a two-color mold

Abstract

The present application relates to the technical field of mould, provide a kind of for double-color mould once material head mould in cutting mechanism, comprising: movable cavity block and secondary fixed cavity block, movable cavity block is provided with material head sticking groove, once material head has handle and auxiliary gate;Secondary fixed cavity block is movably provided with elastic block, the moving direction of elastic block is oblique angle with secondary mould closing direction setting;Compared with prior art, the advantages of the present application are that by the oblique elastic block on secondary fixed cavity block, elastic block moves along the moving direction of movable cavity block secondary mould closing, while also moving along the moving direction perpendicular to movable cavity block secondary mould closing, elastic block moves in this direction, will push the auxiliary gate on once material head and separate from once product, to reach the purpose of being able to automatically cut once material head from once product in double-color mould, this operating mode is more simple and fast, and also can save the labor cost of manufacturing product.

Description

Technical Field

[0001] This invention relates to the field of mold technology, specifically to a one-time in-mold cutting mechanism for a two-color mold and a two-color mold. Background Technology

[0002] Two-color molding refers to the injection molding of two plastic materials on the same injection molding machine, forming the product in two stages, but the product only exits the mold once. This molding process is generally also called two-material injection molding. It is usually completed with one set of molds and requires a specialized two-color injection molding machine. Because this process can make the product look more attractive and it is easy to change colors without the need for painting, two-color molding is becoming increasingly popular in the market.

[0003] When producing products, injection molds or die-casting molds require the product to pass through a runner inside the mold to be formed. Half of the product is the runner, and the other half is the product. The molded part formed after the runner cools is called the sprue, also known as the sprue head or sprue rod. It is usually scrapped or crushed and re-molded. Two-color molds have two sets of moving mold cavities and fixed mold cavities. In most cases, the two sets of moving mold cavities have the same structure. The fixed mold cavities are divided into primary fixed mold cavities and secondary fixed mold cavities. The working process is as follows: After the first mold closing of the two-color mold, the primary fixed mold cavity and one of the moving mold cavities perform an injection action to form the primary product. After the primary product has cooled initially, the two-color mold performs the first mold opening action. At this time, the primary product adheres to the moving mold cavity. After the moving mold cavity moves to the preset position, the two-color injection molding machine drives the moving mold cavity to rotate 180° around the center of the moving mold part and then performs the secondary mold closing action. After the secondary mold closing, the moving mold cavity with the primary product attaches to the secondary fixed mold cavity and performs a secondary injection action. The other moving mold cavity and the primary fixed mold cavity also perform a first injection action at this time. After the two-color mold opens for the second time, the two-color injection molding machine ejects the secondary product from the mold to complete the injection molding production of the product. Then the above working process is repeated until the final product production is completed.

[0004] After the two-color mold is formed in one step, the primary sprue will also rotate along with the primary product. Before the two-color mold can perform the secondary injection action, the primary sprue needs to be separated from the primary product. However, in the traditional two-color mold, the separation of the primary sprue and the primary product is done manually. This operation requires an operator to be stationed next to the two-color injection molding machine to trim the primary sprue after the moving mold part is rotated 180°. The manual trimming operation will increase the manufacturing cost of the product. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a one-time material head in-mold cutting mechanism and a two-color mold, in view of the current state of the prior art.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a primary material head in-mold cutting mechanism for a two-color mold is proposed, including a movable mold cavity block and a secondary fixed mold cavity block. The mutual approach between the movable mold cavity block and the secondary fixed mold cavity block forms a secondary mold closing action of the two-color mold. A material head sticking groove is provided on the movable mold cavity block. The primary material head has a material handle and an auxiliary gate. The material handle is stuck in the material head sticking groove.

[0007] A spring block is movably provided at one end of the secondary fixed mold cavity block near the moving mold cavity block, and the moving direction of the spring block is set at an angle to the secondary mold closing direction;

[0008] When the moving mold cavity block moves to fit against the end of the spring block and continues to push the spring block toward the secondary fixed mold cavity block, the spring block is used to push the primary material head to separate from the primary product formed on the moving mold cavity block.

[0009] In the above-mentioned in-mold cutting mechanism for a two-color mold, a pushing groove is provided on the side wall of the spring block. The end of the pushing groove is connected to the end of the spring block away from the secondary mold cavity block. The width of the pushing groove is greater than the width of the auxiliary gate.

[0010] In the above-mentioned in-mold cutting mechanism for a two-color mold, a spring block seat is detachably connected to the secondary mold cavity block, the spring block seat is provided with a guide channel, and the spring block is movably disposed in the guide channel.

[0011] In the above-mentioned in-mold cutting mechanism for a two-color mold, a blind hole is provided at one end of the spring block inserted into the spring block seat, and an elastic element is provided in the blind hole. The end of the elastic element away from the spring block abuts against the secondary mold cavity block.

[0012] In the above-mentioned in-mold cutting mechanism for a two-color mold, the side wall of the spring block seat is provided with a mounting hole communicating with the guide channel. A limiting screw is connected in the mounting hole. A limiting groove is provided on the side of the spring block near the mounting hole. The end of the limiting screw is movably disposed in the limiting groove.

[0013] In the above-mentioned in-mold cutting mechanism for a two-color mold, the spring block is characterized in that a first hook is provided at the end away from the secondary fixed mold cavity block, and a second hook is provided at the end of the moving mold cavity block near the secondary fixed mold cavity block. When the secondary fixed mold cavity block and the moving mold cavity block are in contact, the first hook and the second hook engage with each other.

[0014] In the above-mentioned in-mold cutting mechanism for a two-color mold, the spring block includes a main body and a limiting part disposed at the end of the main body. The width of the limiting part is greater than the width of the main body. The main body is movably inserted into the guide channel. The spring block seat is provided with a limiting channel communicating with the guide channel. The limiting part is movably inserted into the limiting channel.

[0015] In addition to solving the above-mentioned technical problems, the present invention also proposes a two-color mold, including the above-mentioned in-mold cutting mechanism for a two-color mold.

[0016] Compared with the prior art, the advantage of the present invention is that by setting the spring block at an angle on the secondary fixed mold cavity block, the spring block moves along the secondary mold closing direction of the moving mold cavity block, and at the same time moves along the direction perpendicular to the secondary mold closing direction of the moving mold cavity block. When the spring block moves in this direction, it will push the auxiliary gate on the primary material head to separate from the primary product, thereby achieving the purpose of automatically cutting off the primary material head from the primary product in the two-color mold. This operation method is simpler and faster, and can also save the labor cost of manufacturing products. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention before the second mold closing;

[0018] Figure 2 This is a perspective view of the present invention when the mold is closed;

[0019] Figure 3 It is a 3D view of the product adhering to the moving model cavity block;

[0020] Figure 4 yes Figure 3 Remove the 3D image of the product from the original image;

[0021] Figure 5 It is a three-dimensional view of the cavity block of the secondary fixed model;

[0022] Figure 6 It is a 3D view of the connection between the spring block, the first hook, and the spring block seat;

[0023] Figure 7 yes Figure 6 Sectional view along the middle AA direction;

[0024] Figure 8 It is a 3D diagram of the bullet block;

[0025] Figure 9 This is a 3D diagram of the spring block holder.

[0026] In the diagram, 1. Moving model cavity block; 2. Secondary fixed model cavity block; 3. Sprue adhesion groove; 4. Primary sprue head; 5. Sprue handle; 6. Auxiliary gate; 7. Spring block; 8. Push groove; 9. Spring block seat; 10. Guide channel; 11. Blind hole; 12. Mounting hole; 13. Limiting screw; 14. Limiting groove; 15. First hook; 16. Second hook; 17. Main body; 18. Limiting part; 19. Limiting channel; 20. Primary product. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0028] like Figures 1 to 9 As shown in the figure, this solution mainly focuses on the application of the primary material cutting mechanism in a two-color mold.

[0029] A primary sprue in-mold cutting mechanism for a two-color mold includes a movable mold cavity block 1 and a secondary fixed mold cavity block 2. The mutual approach between the movable mold cavity block 1 and the secondary fixed mold cavity block 2 forms a secondary mold closing action of the two-color mold. The movable mold cavity block 1 is provided with a sprue adhesion groove 3. The primary sprue 4 has a sprue handle 5 and an auxiliary gate 6. The sprue handle 5 is adhered in the sprue adhesion groove 3. A spring block 7 is movably provided at one end of the secondary fixed mold cavity block 2 near the movable mold cavity block 1. The moving direction of the spring block 7 is set at an angle to the secondary mold closing direction. When the movable mold cavity block 1 moves to fit against the end of the spring block 7 and continues to push the spring block 7 towards the secondary fixed mold cavity block 2, the spring block 7 is used to push the primary sprue 4 to separate from the primary product 20 formed on the movable mold cavity block 1.

[0030] After the first mold opening of the two-color mold, the moving mold cavity block 1 drives the primary product 20 to rotate 180° and perform a secondary mold closing action. When the two-color mold opens for the first time, the sprue adhesion groove 3 provided on the moving mold cavity block 1 is used to adhere the sprue 5 part on the primary sprue 4 formed during the injection molding of the primary product 20, so that the primary sprue 4 can adhere to the moving mold cavity block 1, thereby preventing the primary sprue 4 from adhering to the primary fixed mold cavity block and affecting the next primary injection of the two-color mold. During the secondary mold closing process, the spring block 7, which is inclined on the secondary fixed mold cavity block 2, moves towards the secondary fixed mold cavity block 2 under the push of the moving mold cavity block 1. Since the spring block 7 is inclined, while moving along the movement direction of the secondary mold closing of the moving mold cavity block 1, the spring block 7 will also move in a direction perpendicular to the movement direction of the secondary mold closing of the moving mold cavity block 1. When the spring block 7 moves in this direction, it will push the auxiliary gate 6 on the primary sprue 4 to separate from the primary product 20, thereby achieving the purpose of automatically cutting the primary sprue 4 from the primary product 20 within the two-color mold. Compared with the manual operation in the prior art, this operation method is simpler and faster, and can also save the labor cost of manufacturing products.

[0031] Furthermore, a push groove 8 is provided on the side wall of the spring block 7. The end of the push groove 8 is connected to the end of the spring block 7 away from the secondary fixed mold cavity block 2. The width of the push groove 8 is greater than the width of the auxiliary gate 6.

[0032] After the spring block 7 separates the auxiliary gate 6 from the primary product 20, the connection between the primary sprue 4 and the moving mold cavity block 1 will only be the sprue 5. When the auxiliary gate 6 is too long, the primary sprue 4 will shift its position in the two-color mold as the moving mold cavity block 1 moves due to the excessive overhang on the moving mold cavity block 1. This will cause the two-color mold to fail to close properly during the second mold closing. To solve the above problems, in this solution, a pushing groove 8 is provided on the side wall of the spring block 7. The pushing groove 8 can position the auxiliary gate 6 in the pushing groove 8 when the spring block 7 pushes the auxiliary gate 6 to separate from the primary product 20. This can prevent the two-color mold from failing to close properly due to the positional displacement of the auxiliary gate 6. Setting the width of the pushing groove 8 to be greater than the width of the auxiliary gate 6 allows the auxiliary gate 6 to fully enter the pushing groove 8. Connecting the end of the pushing groove 8 with the end of the spring block 7 away from the secondary mold cavity block 2 can prevent the material handle 5 from breaking off from the auxiliary gate 6 after the auxiliary gate 6 has fully entered the pushing groove 8. This allows the primary material head 4 to be completely removed from the two-color mold by clamping the material handle 5 or the auxiliary gate 6 when it is subsequently removed from the two-color mold.

[0033] Furthermore, a spring block seat 9 is detachably connected to the secondary fixed model cavity block 2, and a guide channel 10 is provided on the spring block seat 9, with the spring block 7 movably disposed within the guide channel 10.

[0034] The secondary fixed mold cavity block 2 is relatively large. Directly adding a structure on the secondary fixed mold cavity block 2 to allow for a movable connection between the spring block 7 and the secondary fixed mold cavity block 2 would increase the manufacturing cost. Therefore, this application provides a detachable spring block seat 9 on the secondary fixed mold cavity block 2, and a guide channel 10 for the movement of the spring block 7 is provided on the spring block seat 9. This reduces the manufacturing difficulty of the secondary fixed mold cavity block 2. The detachable connection between the secondary fixed mold cavity block 2 and the spring block seat 9 can be achieved through an inlay method, or by providing several threaded holes on the secondary fixed mold cavity block 2, bolt through holes on the spring block seat 9, and finally connecting the secondary fixed mold cavity block 2 and the spring block seat 9 with bolts.

[0035] Furthermore, a blind hole 11 is provided at one end of the spring block 7 that is inserted into the spring block seat 9. An elastic element is provided in the blind hole 11, and the end of the elastic element away from the spring block 7 abuts against the secondary fixed mold cavity block 2.

[0036] During the second mold closing process of the two-color mold, the moving mold cavity block 1 pushes the spring block 7 towards the secondary fixed mold cavity block 2. During the movement of the spring block 7, the elastic element is slowly compressed. After the second injection of the two-color mold is completed and the mold is opened, the elastic element returns to the extended state and pushes the spring block 7 away from the spring block seat 9. The blind hole 11 provided at one end of the spring block 7 that is inserted into the spring block seat 9 can facilitate the installation and guidance of the elastic element in the spring block 7 and the spring block seat 9, thereby making the spring block 7 move more flexibly in the spring block seat 9. Preferably, the elastic element can be a spring or a rubber product.

[0037] Furthermore, the side wall of the spring block seat 9 is provided with a mounting hole 12 that communicates with the guide channel 10. A limiting screw 13 is connected in the mounting hole 12. A limiting groove 14 is provided on the side of the spring block 7 near the mounting hole 12. The end of the limiting screw 13 is movably disposed in the limiting groove 14.

[0038] When the moving model cavity block 1 separates from the secondary fixed model cavity block 2 and the elastic element returns to its extended state and pushes the spring block 7 away from the spring block seat 9, the limiting groove 14 moves relative to the limiting screw 13 under the action of the elastic element. When the side wall of the limiting groove 14 moves to fit with the end of the limiting screw 13, the spring block 7 stops moving. The setting of the limiting screw 13 and the limiting groove 14 can limit the movement of the spring block 7.

[0039] Furthermore, a first hook 15 is provided at the end of the spring block 7 away from the secondary fixed model cavity block 2, and a second hook 16 is provided at the end of the moving model cavity block 1 close to the secondary fixed model cavity block 2. When the secondary fixed model cavity block 2 and the moving model cavity block 1 are attached, the first hook 15 and the second hook 16 are engaged with each other.

[0040] When the two-color mold is opened for the second time, the second hook 16 moves together with the moving mold cavity block 1 under the drive of the moving mold cavity block 1. When the second hook 16 moves, it drives the spring block 7 to move together through the first hook 15. Since the moving direction of the spring block 7 is set at an angle to the moving direction of the moving mold cavity block 1, after the second hook 16 drives the first hook 15 to move to a certain distance, the first hook 15 and the spring block 7 will move in a direction perpendicular to the moving direction of the moving mold cavity block 1, so that the second hook 16 will automatically disengage from the first hook 15. The setting of the second hook 16 and the first hook 15 can apply a pulling force to the spring block 7 at the moment of the second opening of the two-color mold, so that the spring block 7 can normally disengage from the secondary fixed mold cavity block 2, and prevent the spring block 7 from getting stuck in the secondary fixed mold cavity block 2.

[0041] Furthermore, the spring block 7 includes a main body 17 and a limiting part 18 disposed at the end of the main body 17. The width of the limiting part 18 is greater than the width of the main body 17. The main body 17 is movably inserted into the guide channel 10. The spring block seat 9 is provided with a limiting channel 19 communicating with the guide channel 10. The limiting part 18 is movably inserted into the limiting channel 19.

[0042] During the two-color mold closing process, the spring block 7 moves towards the secondary fixed mold block 2 under the push of the moving mold cavity block 1. After the moving mold cavity block 1 and the secondary fixed mold cavity block 2 are in contact, the limiting part 18 and the limiting channel 19 abut against each other to restrict the continued movement of the spring block 7, thereby preventing the spring block 7 from breaking due to the main body 17 of the spring block 7 abutting against the secondary fixed mold cavity block 2 under the push of the moving mold cavity block 1.

[0043] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0044] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0047] The specific embodiments described herein are merely illustrative examples illustrating the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the scope defined by the spirit of the invention.

Claims

1. A one-shot sprue in-mold cutting mechanism for a two-color mold, comprising a movable mold cavity block and a secondary stationary mold cavity block that are mated together, the mutual approach of the movable mold cavity block and the secondary stationary mold cavity block forming a secondary mold closing action of the two-color mold, characterized in that , The dynamic mold cavity block is provided with a material head sticking groove, the primary material head has a handle and an auxiliary gate, and the handle is stuck in the material head sticking groove; The elastic block is movably arranged on one end of the secondary fixed mold cavity block close to the dynamic mold cavity block, and the moving direction of the elastic block is arranged at an oblique angle with the secondary mold closing direction; When the dynamic mold cavity block moves to abut against the end of the elastic block and continues to push the elastic block to move towards the secondary fixed mold cavity block, the elastic block is used to push the primary material head and the primary product formed on the dynamic mold cavity block to separate; the side wall of the elastic block is provided with a pushing groove, the end of the pushing groove is communicated with the end of the elastic block away from the secondary fixed mold cavity block, and the width of the pushing groove is greater than the width of the auxiliary gate; During the secondary mold closing process, the elastic block obliquely arranged on the secondary fixed mold cavity block moves towards the secondary fixed mold cavity block under the pushing of the dynamic mold cavity block; since the elastic block is obliquely arranged, the elastic block moves along the moving direction of the secondary mold closing of the dynamic mold cavity block, and also moves along a direction perpendicular to the moving direction of the secondary mold closing of the dynamic mold cavity block; when the elastic block moves along the direction, the elastic block pushes the auxiliary gate on the primary material head and the primary product to separate; the pushing groove enables the auxiliary gate to be positioned in the pushing groove when the elastic block pushes the auxiliary gate and the primary product to separate.

2. An in-mold trim mechanism for a two-shot mold of the type defined in claim 1, characterized in that, The elastic block seat is detachably connected to the secondary fixed mold cavity block, the elastic block seat is provided with a guide channel, and the elastic block is movably arranged in the guide channel.

3. A one-shot sprue in-mold cut-off mechanism for a two-color mold as defined in claim 2, wherein One end of the elastic block inserted into the elastic block seat is provided with a blind hole, the blind hole is provided with an elastic member, and one end of the elastic member away from the elastic block abuts against the secondary fixed mold cavity block.

4. A mechanism for in-mold trimming of a sprue end in a two-color mold according to claim 2, wherein A mounting hole communicated with the guide channel is arranged on the side wall of the elastic block seat, a limiting screw is connected in the mounting hole, a limiting groove is arranged on one side of the elastic block close to the mounting hole, and the end of the limiting screw is movably arranged in the limiting groove.

5. A one-shot sprue in-mold cutting mechanism for a two-color mold as defined in claim 1, wherein A first pull hook is arranged at one end of the elastic block away from the secondary fixed mold cavity block, a second pull hook is arranged at one end of the dynamic mold cavity block close to the secondary fixed mold cavity block, and the first pull hook and the second pull hook are clamped with each other when the secondary fixed mold cavity block abuts against the dynamic mold cavity block.

6. A one-shot sprue in-mold cutting mechanism for a two-color mold as defined in claim 2, wherein The elastic block comprises a main body part and a limiting part arranged at the end of the main body part, the width of the limiting part is greater than the width of the main body part, the main body part is movably inserted into the guide channel, the elastic block seat is provided with a limiting channel communicated with the guide channel, and the limiting part is movably inserted into the limiting channel.

7. A two-color mold characterized by, The application discloses a primary material head in-mold cutting mechanism for a double-color mold.

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