Die sticking solving structure of double-injection die

Abstract

The utility model provides a mold sticking solution structure of a bijection mold, which comprises a front mold and a rear mold, the front mold is provided with a mounting groove, and a movably connected elastic block insert and an elastic piece for driving the elastic block insert to move are arranged in the mounting groove; during mold closing, the front mold, the rear mold and at least part of the elastic block insert are jointly enclosed to form an accommodating cavity for accommodating a product; wherein the front mold and the elastic block insert jointly form an upper parting surface in contact with the product, the rear mold is provided with a lower parting surface in contact with the product, and through the collaborative design of the elastic block insert, the elastic piece and the clamping block, the one-shot product can be smoothly transferred to the rear mold from the front mold during mold opening, and is prevented from being adhered to the front mold; the mold sticking problem is solved, manual intervention is not needed in the whole process, the production efficiency and the automation degree are improved, and the mold sticking device is simple in design structure, convenient to disassemble and assemble, easy to operate and low in cost.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding processing technology, specifically relating to a structure for solving the sticking problem of a double-shot mold. Background Technology

[0002] In the field of plastic molds, two-shot molding technology is widely used in the manufacture of products that require multiple materials or two-color structures. In existing technologies, two-shot molds usually achieve the switching between two injections through parting surface design. However, for products with transparent PC material and complex structure in the first shot, due to the strong adhesion of the material and the limitation of the parting surface, the first shot product is easy to adhere to the front mold, which leads to positioning offset or demolding difficulties when rotating the second shot product.

[0003] Traditional solutions often rely on increasing the number of ejector pins or optimizing the demolding angle. However, transparent PC materials have strict requirements for appearance, and ejector pins are prone to leaving marks on the surface. Furthermore, the adjustment of the demolding angle is limited by the product structure, making it difficult to completely solve the sticking problem. In addition, the positioning mechanism of the existing mold is not precise enough, causing the first-shot product to misalign with the rear mold during rotation, further aggravating the sticking phenomenon. Utility Model Content

[0004] (1) Technical problems to be solved

[0005] This utility model provides a structure for solving the sticking problem of double-shot molds, aiming to solve the problems of difficult product demolding and easy damage to the product during the demolding process.

[0006] (2) Technical solution

[0007] This utility model provides a structure for solving the sticking problem of a double-shot mold, including a front mold and a rear mold. The front mold is provided with a mounting groove, and the mounting groove is provided with a movable spring insert and an elastic element for driving the spring insert to move. When the mold is closed, the front mold, the rear mold and at least part of the spring insert together form a receiving cavity for accommodating the product.

[0008] The front mold and the spring insert together form an upper parting surface that contacts the product, while the rear mold has a lower parting surface that contacts the product.

[0009] Furthermore, the spring insert has an "L" shaped structure, including a connecting part and an abutting part. The connecting part is slidably connected to the mounting groove, and the abutting part abuts against the product.

[0010] Furthermore, the front mold is provided with a snap-fit ​​block, the snap-fit ​​block is provided with a first step, and the spring block insert is provided with a second step that is adapted to the first step.

[0011] Furthermore, during mold closing, a floating gap is provided between step one and step two.

[0012] Furthermore, the abutting part is provided with a limiting abutting surface one, and the bottom of the front mold is provided with a limiting abutting surface two corresponding to the limiting abutting surface one.

[0013] Furthermore, the product is provided with a fastening position, which corresponds to the abutting position of the spring block insert.

[0014] Furthermore, there are four fasteners, and each pair of fasteners arranged side by side forms a group. The two groups of fasteners are symmetrically arranged with respect to the midline L1 of the product.

[0015] Furthermore, the spring insert is provided with a connecting groove, and the elastic element is pressed into the connecting groove.

[0016] Furthermore, the elastic element is a metal spring.

[0017] Furthermore, the elastic element is a high-temperature resistant soft elastic material.

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

[0019] 1. Through the coordinated design of spring inserts, elastic components, and snap-fit ​​blocks, the product can be smoothly transferred from the front mold to the rear mold during mold opening, avoiding adhesion to the front mold and solving the sticking problem. The whole process does not require manual intervention, improving production efficiency and automation. This design is simple in structure, easy to disassemble and assemble, simple to operate, and low in cost.

[0020] 2. The four-position design ensures that the product is subjected to uniform force during ejection, which guarantees the integrity of the appearance and reduces deformation or damage. At the same time, it accurately positions the first injection product and ensures that it is aligned with the rear mold after rotating 180 degrees after demolding, which improves the accuracy and yield of subsequent second injection molding. Attached Figure Description

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

[0022] Figure 2 This is an exploded view of the overall structure of this utility model.

[0023] Figure 3 This is a schematic diagram of the front mold of this utility model.

[0024] Figure 4 This is a schematic diagram of the upper parting surface of this utility model.

[0025] Figure 5 This is a schematic diagram of the lower parting surface of this utility model.

[0026] Figure 6 This is an exploded view of the elastic insert of this utility model.

[0027] Figure 7 This is a schematic diagram of the snap-fit ​​component of this utility model.

[0028] Figure 8 This is a cross-sectional view of the front mold and the product front of this utility model.

[0029] Figure 9 This is a schematic diagram of the mold-closed state of this utility model.

[0030] Figure 10 This is a schematic diagram of the mold opening step abutment of this utility model.

[0031] Figure 11 This is a schematic diagram of the complete demolding of this utility model.

[0032] Figure 12 This is a diagram showing the state of the product after demolding from the front mold.

[0033] Figure 13 This is a schematic diagram of one embodiment of the present invention.

[0034] Figure 14 This is a schematic diagram of Embodiment 2 of the present invention.

[0035] Figure 15 This is a schematic diagram of Embodiment 3 of the present invention.

[0036] Figure 16 This is a schematic diagram of the product of this utility model.

[0037] Reference numerals: 1-Front mold, 11-Mounting groove, 12-Limiting abutment surface two, 13-Upper parting surface, 2-Rear mold, 21-Lower parting surface, 3-Elastic block insert, 31-Connecting groove, 32-Elastic element, 33-Abutting part, 331-Sloping surface, 332-Limiting abutment surface one, 34-Connecting part, 35-Step two, 4-Product, 41-Snap-on position, 5-Receiving cavity, 6-Snap-on block, 61-Step one, 62-Through hole, 63-Fastener, 64-Floating gap. Detailed Implementation

[0038] 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.

[0039] The first injection product 4 of this utility model is made of transparent PC. After injection molding, due to the strong adhesion of the material and the limitation of the parting surface, the first injection product 4 easily adheres to the front mold 1. The contact area between the first injection product 4 and the front mold 1 is greater than the contact area with the rear mold 2. The product 4 is adsorbed on the front mold 1 of the mold, which causes the product 4 to stick to the mold, and thus makes it impossible to demold and remove the second injection product 4 normally when it is rotated and molded.

[0040] In response to the above problems, such as Figure 1-16 As shown, this utility model provides a structure for solving the sticking problem of a double-shot mold, including a front mold 1 and a rear mold 2. The front mold 1 is provided with a mounting groove 11, and the mounting groove 11 is provided with a movable spring insert 3 and an elastic element 32 for driving the spring insert 3 to move. When the mold is closed, the front mold 1, the rear mold 2 and at least part of the spring insert 3 together form a receiving cavity 5 for accommodating the product 4.

[0041] Among them, such as Figure 4-9 As shown, the front mold 1 and the spring insert 3 together form an upper parting surface 13 that contacts the product 4. The rear mold 2 is provided with a lower parting surface 21 that contacts the product 4. In use, during the mold closing process of the front mold 1 and the rear mold 2, the elastic element 32 is compressed. Since at least a portion of the spring insert 3 extends into the receiving cavity 5, a portion of the spring insert 3 is connected to the injection-molded product 4. During the mold opening process, the elastic element 32 moves with the front mold 1 to achieve automatic reset. Then, the elastic element 32 releases the compressed state and ejects the product 4 towards the rear mold 2, thereby applying a force to the product 4 to better adhere to the rear mold 2 and detach it from the front mold 1.

[0042] Furthermore, such as Figure 6 As shown, the spring insert 3 is provided with a connecting groove 31, the elastic element 32 is disposed in the connecting groove 31 and abuts against the inside of the connecting groove 31, and the other end abuts against the front mold 1, so as to realize the movable connection between the spring insert 3 and the front mold 1.

[0043] Furthermore, the elastic element 32 is a metal spring or a high-temperature resistant soft elastic material. The high-temperature resistant soft elastic material is relatively soft and can play a certain buffering role when the spring insert 3 contacts the product 4. However, in this embodiment, a metal spring is used as the elastic element 32. The metal spring can provide stable and predictable elastic force during the mold opening and closing process, ensuring that the spring insert 3 applies appropriate pushing force to the product 4, so that the product 4 can be accurately transferred from the first injection mold 1 to the rear mold 2. This avoids problems such as damage to the product 4 due to excessive elastic force or unsuccessful transfer due to insufficient elastic force, ensuring the smooth progress of the entire double injection molding process. At the same time, the spring has good elastic recovery performance. After pushing the spring insert 3 to complete the transfer action of the product 4, it can automatically reset and prepare for the next molding without manual intervention, improving production efficiency and automation. It is also easy to disassemble and assemble, simple to operate, and low in cost. By selecting springs of different specifications and elastic coefficients, it can adapt to the first injection product 4 of different sizes and weights, making the sticking mold solution structure have good versatility and flexibility, and can meet the production needs of various products 4.

[0044] Specifically, such as Figure 6 As shown, the spring insert 3 has an "L" shaped structure, including a connecting part 34 and an abutting part 33. The connecting part 34 is slidably connected to the mounting groove 11, and the abutting part 33 abuts against the product 4.

[0045] Specifically, such as Figure 7 As shown, the front mold 1 is also provided with a snap-fit ​​block 6. The snap-fit ​​block 6 is located in the mounting groove 11 on one side of the spring block insert 3. The snap-fit ​​block 6 is provided with a through hole 62. A fastener 63 is provided in the through hole 62. The fastener 63 fixes the snap-fit ​​block 6 to the front mold 1. The fastener 63 can be a pin, screw or bolt. In this embodiment, the fastener 63 is a pin. The process of disassembling and installing the pin is simple. Just insert or pull the pin into the through hole 62. It is convenient for mold maintenance and adjustment. Moreover, the manufacturing cost of the pin is low. It can provide a stable fastening force and ensure that the snap-fit ​​block 6 will not loosen during operation.

[0046] like Figure 8-12 As shown, during the mold opening process, the spring insert 3, under the elastic action of the elastic element 32, ejects the product 4 towards the rear mold 2, thus completely separating the product 4 from the front mold 1. To prevent the elastic element 32 from sticking to the product 4, ensuring successful demolding of the product 4 from the front mold 1, and to prevent the elastic element 32 from affecting subsequent rotation for secondary injection molding, the snap-fit ​​block 6 is provided with a step 61, and the spring insert 3 is provided with a step 35 corresponding to the step 61. During the mold opening process, as the front mold 1 moves, the snap-fit ​​block 6 stretches the elastic element 32. During the movement, the step 61 of the snap-fit ​​block 6 and the step 35 of the spring insert 3... Step 2 35 abuts, and the locking block 6 continues to move upward with the front mold 1, thereby driving the spring block insert 3 to move upward, so that the spring block insert 3 completely separates from the product 4, realizing the complete demolding of the product 4 from the front mold 1. Through the synergistic action of step 1 61 and step 2 35, the elastic force is used to achieve initial demolding, and the residual stress of the elastic element 32 is eliminated by limiting the sticking risk. The reliability of the demolding action is ensured by the double protection. This design avoids the common skew and jamming problem of traditional spring ejection mechanisms. Through the precise design of the contact time between step 1 61 and step 2 35, a three-stage demolding sequence of elastic ejection to mechanical separation and finally to complete withdrawal is realized.

[0047] Furthermore, during mold closing, a floating gap 64 is provided between the first step 61 and the second step 35. The first step 61 is located below the second step 35, so that when the first step 61 moves away from the rear mold 2 along with the front mold 1, the first step 61 will only abut against the second step 35 after a period of time during its ascent. This allows the elastic element 32 to release its compression during this period and eject the product 4 towards the rear mold 2, giving the elastic element 32 the time required for ejection. After the first step 61 abuts against the second step 35, the locking block 6 continues to move away from the rear mold 2, driving the elastic element 32 away from the product 4, thus achieving complete demolding of the front mold 1 and the product 4.

[0048] Furthermore, the step 61 is an "L" shaped structure. The L-shaped structure provides a larger contact area and better mechanical support, making the connection between the snap-fit ​​block 6 and the spring insert 3 more stable. This ensures that the movement of the spring insert 3 is more stable during the opening and closing of the mold. In addition, the L-shaped structure can better adapt to the internal spatial layout of the mold, avoid interference with other components, and improve the utilization rate of the internal space of the mold.

[0049] The abutting part 33 is provided with a limiting abutting surface 332, and the bottom of the front mold 1 is provided with a limiting abutting surface 12 corresponding to the limiting abutting surface 332.

[0050] like Figure 13-15 As shown, in order to achieve the limiting of the spring block insert 3, there are three embodiments to limit the spring block insert 3. Embodiment 1: When the limiting abutment surface 332 of the abutment part 33 is lower than the limiting abutment surface 12, the height of the connecting part 34 is equal to that of the mounting groove 11. When the mold is closed, the spring block insert 3 is limited by the equal height of the mounting groove 11 and the connecting part 34, so that part of the spring block insert 3 abuts against the product 4.

[0051] Example 2: When the limiting abutment surface 332 of the abutment part 33 just abuts with the limiting abutment surface 12, the height of the connecting part 34 is lower than the height of the mounting groove 11. When the mold is closed, the limiting abutment surface 332 and the limiting abutment surface 12 abut against each other, thereby causing the spring block insert 3 to abut against the product 4 under the action of the front mold 1.

[0052] Example 3: The limiting abutment surface 332 of the abutment part 33 just abuts against the limiting abutment surface 12, and the height of the connecting part 34 is equal to the height of the mounting groove 11. The two fit together to achieve the matching of the spring block insert 3 and the front mold 1. When the mold is closed, part of the spring block insert 3 can extend into the receiving cavity 5 to form the product 4.

[0053] Specifically, such as Figure 16 As shown, the product 4 is provided with a snap fastener 41, and the spring block insert 3 includes an abutment portion 33. The abutment portion 33 of the spring block insert 3 extends into the receiving cavity 5 formed when the front mold 1 and the rear mold 2 are closed. The abutment portion 33 corresponds to the snap fastener 41, ensuring that the product 4 can accurately stay on the rear mold 2 when the mold is opened, avoiding the problem of sticking to the front mold 1. At the same time, by using the snap fastener 41, the contact area of ​​the product in the front mold 1 is reduced during the demolding process, so that the product 4 is not easily damaged. The design of the snap fastener 41 ensures the appearance integrity and yield of the product 4.

[0054] Furthermore, four fasteners 41 are provided, with each pair of fasteners 41 arranged side by side as a group. The two groups of fasteners 41 are symmetrically arranged around the center line L1 of the product 4. By providing four fasteners 41 on the product 4, it is ensured that the product 4 is subjected to uniform force during ejection, reducing deformation or damage caused by uneven force. In addition, the four fasteners 41 can more accurately position the first-shot product 4, ensuring that it is aligned with the rear mold 2 after rotating 180 degrees after demolding, thereby improving the accuracy of subsequent second-shot injection molding and preventing the product 4 from shifting or shaking. This reasonable design of the fasteners 41 reduces failures during ejection and rotation, improves production efficiency, and reduces production costs.

[0055] Furthermore, such as Figure 8 As shown, the abutting part 33 is provided with a slope 331, which is bonded to the product 4. During the demolding process, by setting the slope 331, the abutting part 33 of the spring block insert 3 is guided to smoothly disengage from the buckle 41 of the product 4, reducing friction and wear, improving the convenience of demolding, and preventing the product 4 from getting stuck or damaged during demolding. At the same time, the slope 331 is used to disperse stress and reduce damage caused by stress concentration.

[0056] The following is a detailed explanation of the working principle of this utility model;

[0057] In use, the front mold 1 and the rear mold 2 are closed to form a receiving cavity 5. The elastic element 32 is in a compressed state. The spring block insert 3 extends into the receiving cavity 5 to be injection molded to form the product 4. When the mold is opened, the elastic element 32 moves with the front mold 1 to achieve automatic reset. The elastic element 32 of the spring block insert 3 is released from the compressed state, and the product 4 is ejected towards the rear mold 2. Force is applied to make the product 4 stick to the rear mold 2 and detach from the front mold 1. Subsequently, as the front mold 1 and the rear mold 2 separate, the step 61 of the snap-fit ​​block 6 abuts against the step 35 of the spring block insert 3. As the front mold 1 and the rear mold 2 continue to separate, the snap-fit ​​block 6 drives the spring block insert 3 to move upward, so that the spring block insert 3 completely leaves the product 4, realizing the complete demolding of the product 4 from the front mold 1.

[0058] The innovation of this utility model lies in the coordinated design of the spring block insert, elastic element, and snap-fit ​​block, which enables the first-shot product to be smoothly transferred from the front mold to the rear mold during mold opening, avoiding adhesion to the front mold and solving the mold sticking problem. The entire process requires no manual intervention, improving production efficiency and automation. This design is simple in structure, easy to assemble and disassemble, simple to operate, and low in cost. The four-locking design ensures that the product is subjected to uniform force during ejection, ensuring the integrity of the appearance and reducing deformation or damage. At the same time, it accurately positions the first-shot product, ensuring that it is aligned with the rear mold after rotating 180 degrees after demolding, improving the accuracy and yield of subsequent second-shot injection molding.

[0059] 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.

[0060] 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 structure for resolving mold sticking in a double-shot mold, characterized in that, The mold includes a front mold (1) and a rear mold (2). The front mold (1) is provided with a mounting groove (11). The mounting groove (11) is provided with a movable spring insert (3) and an elastic element (32) for driving the spring insert (3) to move. When the mold is closed, at least a portion of the front mold (1), the rear mold (2) and the spring insert (3) together enclose a receiving cavity (5) for accommodating the product (4). The front mold (1) and the spring insert (3) together form an upper parting surface (13) that contacts the product (4), while the rear mold (2) is provided with a lower parting surface (21) that contacts the product (4).

2. The structure for resolving mold sticking in a double-shot mold according to claim 1, characterized in that, The spring insert (3) has an "L" shaped structure, including a connecting part (34) and an abutting part (33). The connecting part (34) is slidably connected to the mounting groove (11), and the abutting part (33) abuts against the product (4).

3. The structure for resolving mold sticking in a double-shot mold according to claim 2, characterized in that, The front mold (1) is provided with a snap-fit ​​block (6), the snap-fit ​​block (6) is provided with a step one (61), and the spring block insert (3) is provided with a step two (35) that is adapted to the step one (61).

4. The structure for resolving mold sticking in a double-shot mold according to claim 3, characterized in that, When the mold is closed, a floating gap (64) is provided between the first step (61) and the second step (35).

5. The structure for resolving mold sticking in a double-shot mold according to claim 2, characterized in that, The abutting part (33) is provided with a limiting abutting surface one (332), and the bottom of the front mold (1) is provided with a limiting abutting surface two (12) corresponding to the limiting abutting surface one (332).

6. The structure for resolving mold sticking in a double-shot mold according to claim 5, characterized in that, The product (4) is provided with a buckle (41), which corresponds to the position of the abutting part (33) of the spring block insert (3).

7. The structure for resolving mold sticking in a double-shot mold according to claim 6, characterized in that, There are four buckle positions (41). Each pair of buckle positions (41) arranged side by side forms a group. The two groups of buckle positions (41) are symmetrically arranged with respect to the midline L1 of the product (4).

8. The structure for resolving mold sticking in a double-shot mold according to claim 1, characterized in that, The spring insert (3) is provided with a connecting groove (31), and the elastic element (32) is pressed into the connecting groove (31).

9. The structure for resolving mold sticking in a double-shot mold according to claim 8, characterized in that, The elastic element (32) is a metal spring.

10. The structure for resolving mold sticking in a double-shot mold according to claim 8, characterized in that, The elastic element (32) is a high-temperature resistant soft elastic material.

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