Mold structure for complex injection molding of multi-insert product

Abstract

The utility model relates to a mold structure for complex injection molding of a multi-insert product, which comprises a secondary injection mold core, a movable molding insert and a resistance wire, the movable molding insert is arranged in the secondary injection mold core, and an insert convenient to take out and exchange is arranged at the top of the movable molding insert. A plurality of products and a plurality of inserts are placed through the movable molding insert and the interchangeable insert to form a secondary injection molding structure, and the secondary injection molding structure is used for meeting the requirement that the plurality of products and the plurality of inserts are placed and formed at a time in a secondary injection molding mode. According to the utility model, the insert can be synchronously formed, the insert can be automatically placed in the production process, and the device is more effective and more convenient for similar products using PINs and inserts, especially multi-insert products, according to the requirements of mass production.

Description

Technical Field

[0001] The utility model relates to an injection mold, in particular to a mold structure for complex injection molding of multi-insert products. Background Art

[0002] With the development of the plastics industry, plastic products are expanding and being used more and more widely in various industries, and the structure of products is becoming more and more complex. There are higher standards for the precision matching of molds and the stability of dimensions. The complexity of products directly places higher requirements on the stability of mold structures. How to ensure the simplicity of processing, the convenience of maintenance, and the rationality of structure while simplifying the structure has become a series of research courses.

[0003] The rapid development of science and technology, shortened delivery time and rapid response to market demand have become the first elements for injection mold companies to participate in market competition. With the pursuit of excellence in quality and the progress of social science and technology, in order to meet the needs of new energy vehicles and full digitalization, the application of plastic products has become diversified in various fields. Therefore, plastic products have a more cutting-edge appearance, visual sense, and application properties. At the same time, to meet the original product structure, more complex technical requirements and typical parts of special structures need to be added. It is necessary to consider the rationality and stability of the structure, the simplicity of processing and the convenience of production. How to demold and place inserts smoothly under complex models is an upgrade of the design concept.

[0004] Special products have Figure 1 As shown in the figure, many PINs and many inserts cannot be formed at one time. The usual design and practice is to complete one product at a time and then assemble them together. During assembly and testing, it is easy to have assembly problems and test failures, which is contrary to the molding cycle. In the processing process, not only the process is increased, but also the labor cost is increased. The product placement cycle is very long, and this mold needs to be operated under high temperature conditions. There is a risk of misplacement or omission, which leads to the high cost of multi-structure products. In the placement process, the operation is difficult under the premise of mold temperature, especially in summer, there is a risk of injury to the placement personnel and the possibility of carbonization of the mold hot runner due to long time. In order to avoid the above problems, the early design of the mold must give priority to how to avoid possible problems, control the placement of inserts, improve the original structure of the product, avoid omissions and affect the molding cycle, and even if problems occur, they can be discovered and corrected immediately. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a simplified mold structure for multi-insert multi-PIN products which is simple, safe, reliable and has high production efficiency, and solves the problem of shortening the placement cycle of the current placement of inserts.

[0006] In order to solve the above technical problems, the technical solution of the utility model is: a mold structure for complex injection molding of multi-insert products, including a two-shot mold core, a movable molding insert, and a resistance wire. A movable molding insert is arranged inside the two-shot mold core, and an interchangeable insert is arranged on the top of the movable molding insert for easy removal. Multiple products and multiple inserts are placed through the movable molding insert and the interchangeable insert to form a secondary injection molding structure, which is used to meet the needs of placing multiple products and multiple inserts for one molding through secondary injection molding.

[0007] Furthermore, the multiple products include a single PIN needle product made by injection molding of a first-shot mold and a single product made by a second set of molds.

[0008] Further, the resistance wire is fixed to the individual products and mounted on the two-shot mold core.

[0009] Further, the product of a single PIN needle is mounted on a two-shot mold.

[0010] Further, the plurality of inserts includes 15 cylindrical inserts and 1 disc insert.

[0011] Furthermore, 15 cylindrical inserts and 1 disc insert are successively installed on the two-shot mold core.

[0012] The beneficial effects of the utility model are:

[0013] The utility model adds a secondary injection molding structure to the original mold, and through the secondary injection molding method, multiple products and multiple inserts can be placed in one molding, which can be carried out simultaneously with the molding, and the production realizes automatic placement of inserts. According to mass production needs, it is more effective and convenient for similar products using PIN needles and inserts, especially multi-insert products. The difficulty involved is that there are many types of inserts, and the installation of the inserts needs to have a sequence. The first shot and the second shot of the product are finally combined on a product for molding. During injection molding, the heating wire and the insert must be installed in place, and finally a qualified product can be made. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the finished product;

[0015] Figure 2 This is a schematic diagram of the first shot encapsulation product;

[0016] Figure 3 A schematic diagram of a fixed-shot heating wire;

[0017] Figure 4 This is a schematic diagram of placing the heating wire product before two-shot injection molding;

[0018] Figure 5 This is a schematic diagram of the product after the heating wire is placed and fixed before two-shot injection molding;

[0019] Figure 6 This is a schematic diagram of the first shot PIN needle encapsulation;

[0020] Figure 6.1 To add a schematic diagram of replacement inserts;

[0021] Figure 6.2 A schematic diagram for placing interchangeable inserts;

[0022] Figure 7 This is a schematic diagram of the product with encapsulated PIN needles placed before two-shot injection molding;

[0023] Figure 8 This is a schematic diagram of placing inserts in one shot; (15 pieces)

[0024] Fig. 9 Schematic diagram of insert placement before two-shot injection molding; (15 pieces)

[0025] Fig.10 This is a schematic diagram of placing an insert in one shot; (1 piece)

[0026] Fig.11 Schematic diagram of insert placement before two-shot injection molding; (1 piece)

[0027] Fig.12 Assembly drawing for placing product for two-shot injection mold. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0029] like Figures 1 to 12 As shown, the mold structure of the complex injection molding of the multi-insert product of the utility model adds a secondary injection molding structure to the original mold, and the secondary injection molding method satisfies the placement of multiple products and multiple inserts in one molding. It can be carried out synchronously with molding, and the production realizes the automatic placement of inserts, including the interior of the mold core is provided with a movable molding insert, and the movable molding insert is provided with an interchangeable insert 7 for easy removal. According to the mass production requirements, for similar products using PIN needles and inserts, especially multi-insert products, it is more effective and convenient. The difficulty involved is that there are many types of inserts, and the installation of inserts needs to be in sequence. The first shot and the second shot of the product are finally combined on a product for molding. During injection molding, the heating wire and the insert must be installed in place, and finally a qualified product can be made.

[0030] Product molding, molding one shot product, such as Figure 1 As shown, the mold of the PIN pin needs to first put each PIN pin into the mold and make a single PIN pin product 4 through one-shot mold injection molding. Figure 2 As shown, it is a single injection molded product 5, and a single product 5 is made by a second set of molds. Figure 3 As shown, the resistance wire 6 is bent automatically. First, a long resistance wire is split into the required Figure 2 The shape of the product, check whether the resistance wire 6 is abnormal in heating, and fix the resistance wire 6 after confirming that there is no abnormality. Figure 2 For a single product, it is important to note that the resistance wire 6 is relatively hard. When assembling, the two ends of the resistance wire 6 need to be fixed by the buckles at each end of the product. When installing the resistance wire 6, no force can be applied to cause the resistance wire 6 to short-circuit during assembly. Make sure that the resistance wire 6 can be completely fixed. Figure 2 For the product, it is necessary to check whether the resistance wire 6 is energized normally again, and then install it on the second shot mold core 1 after confirmation. Figure 5 As shown, during assembly, you need to pay attention to the assembly position and anti-hanging, as well as the positioning on the mold core to control whether the first shot product is installed in place before assembly. Figure 6 When installing the PIN pin of the first-shot injection molded product on the second-shot mold core, it is necessary to ensure that the PIN pin is installed in place during assembly. If it cannot be installed in place, the PIN pin position will be incorrect, resulting in a difference in the position of the PIN pin at the other end. Figure 6.1 The position-changing insert (movable molding insert) shown in the figure can meet the production needs of interchangeable inserts 7 for two products at the same time. The advantage is that there is no need to remove the mold to install the insert during the production process, which improves production efficiency and saves costs. Figure 6.2 , Figure 7 As shown, the 15 cylindrical inserts 2 are then installed as shown in FIG. Figure 8 As shown, after installing 15 cylindrical inserts 2, the assembly can be completed as shown in FIG. Fig. 9 The disc insert 3 shown, such as Fig.10 The figure shows the final picture after all the inserts are assembled. The final product is ejected from the mold and is a good product. Paying attention to the flatness of the insert placement is the key to ensuring that the plastic part can be ejected smoothly. Therefore, there are strict requirements on the matching tolerance between the mold and the insert. Too tight will cause the insert to be strained, and too loose will produce flash, which will greatly reduce the insulation of the insert and also have a poor appearance. In view of this,

[0031] In the early development process of the mold, it is necessary to understand the expansion coefficients of different materials of the insert, select different fitting clearance tolerances, design the correct material (plastic) shrinkage ratio, and select appropriate exhaust data, which are perfectly reflected in this set of molds, and ultimately meet the customer's assembly and performance test requirements. At the same time, valuable experience is collected and extended on future insert molds.

Claims

1. A mold structure for complex injection molding of multi-insert products, characterized by: The invention comprises a two-shot mold core, a movable molding insert and a resistance wire. The two-shot mold core is provided with a movable molding insert inside. The top of the movable molding insert is provided with an insert which is convenient for taking out and exchanging. A plurality of products and a plurality of inserts are placed through the movable molding insert and the interchangeable insert to form a secondary injection molding structure, which is used to meet the requirements of placing a plurality of products and a plurality of inserts in one molding through secondary injection molding.

2. The mold structure for complex injection molding of multi-insert products according to claim 1, characterized in that: The multiple products include a single PIN product made by one shot mold and a single product made by a second set of molds.

3. The mold structure for complex injection molding of multi-insert products according to claim 2, characterized in that: The resistance wire is fixed to the individual products and mounted on the two-shot mold.

4. The mold structure for complex injection molding of multi-insert products according to claim 2, characterized in that: The single PIN product is mounted on the two-shot mold.

5. The mold structure for complex injection molding of multi-insert products according to claim 1, characterized in that: Multiple inserts include 15 cylindrical inserts and 1 disc insert.

6. The mold structure for complex injection molding of multi-insert products according to claim 5, characterized in that: Fifteen cylindrical inserts and one disc insert are installed successively into the two-shot mold.

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