Interchangeable insert positioning mold structure

Abstract

The utility model relates to an interchangeable embedded part positioning die structure, including front mould frame, front mould kernel, rear mould kernel, spring, movable forming insert pin, movable forming insert pin is equipped with floating stroke along the axial direction, and spring is added between bottom and front mould kernel, and spring is used for pushing movable forming insert pin to the direction of being away from rear mould kernel under the die opening state, and it is convenient to place the embedded part in the front mould, be equipped with rear mould positioning insert pin with movable forming insert pin position corresponding on rear mould kernel, and the top of movable forming insert pin and rear mould positioning insert pin all is equipped with automatic guide conical feature, is used for docking and finding the center of circle when closing, embedded part is transferred to rear mould positioning insert pin on movable forming insert pin in the die closing process, realizes positioning interchange, the utility model has the advantages of simple operation, safety, reliable, guarantees the die opening and the return of no order, avoids the complex structure, finishes twice ejection through a step, realizes the smooth stripping of product, can complete the automatic production, improves production efficiency, saves manpower and material resources simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically to an interchangeable insert positioning mold structure for solving the problem of metal insert sticking to the mold, which is suitable for injection molding processes where multiple inserts are integrally molded with plastic. Background Technology

[0002] With the rapid development of the plastics industry, plastic products are increasingly widely used across various sectors, and their structures are becoming more complex. This places higher demands on the precision of mold fitting and dimensional stability. Especially for products with special functions, unique requirements, and unexpected shapes, greater structural breakthroughs are needed to meet design requirements.

[0003] With the pursuit of excellence in quality and the advancement of social technology, the applications of plastic products have become increasingly diversified across various fields. Product shapes are becoming more complex, and there are also typical parts with special structures that require integrated plastic molding processes. This necessitates consideration of structural rationality and stability, as well as processing simplicity and ease of production. A key challenge is how to successfully demold complex mold structures.

[0004] Some special product designs and structures are like Figure 1 The product shown in Figure 2, with four inserts 1, needs to be integrally injection molded. Initially, following the conventional demolding structure, insert 1 is designed to be placed on the front mold insert pin. However, due to the requirement that the side of the insert in the area indicated by arrow 2 needs to be close to the mold sealant, and considering the large dimensional changes of the metal insert under thermal expansion and contraction, posing a potential risk of sticking to the mold, measures are taken to avoid product damage during demolding. Therefore... Figure 3 As shown, a 4.00mm movable stroke is designed at the bottom of the front mold insert 4. The purpose is to allow the front mold insert 4 to move towards the rear mold side when the mold is opened after molding, so that the side wall of the metal insert is separated from the area of ​​the front mold core to avoid sticking to the mold. However, in production, the problem of the four metal inserts sticking to the front mold has not been effectively solved. After trying various adjustment schemes such as adding undercuts to the rear mold side, the defect rate of products produced by this mold set is still high.

[0005] In existing technologies, such as the "mold-built blind hole insert positioning structure" disclosed in patent document (CN205989483U), the blind hole insert is formed by the cooperation of the front mold insert pin and the rear mold insert. However, it does not consider the risk of the metal insert sticking to the mold, especially when there is a gap between the insert and the mold core and the sealant. During demolding, the product is easily damaged because the insert is stuck in the front mold. The "metal ring insert positioning mechanism" disclosed in patent document (CN211566787U) is used to position the ring insert by the front mold spring pin and the rear mold positioning spring block. However, it only addresses the accuracy problem of the ring insert and does not solve the sticking problem in multi-insert scenarios. Moreover, it lacks a positioning interchange mechanism and cannot meet the demolding requirements of complex structure products. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide a simple, safe, reliable and highly efficient interchangeable insert positioning mold structure, which solves the problem of metal insert sticking to the mold and causing damage during product demolding.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an interchangeable insert positioning mold structure, comprising a front mold base, a front mold core, a rear mold core, an insert, a rear mold positioning pin, a spring, and a movable forming pin disposed within the front mold core; the movable forming pin has a floating stroke along the axial direction, and a spring is installed between its bottom and the front mold core, the spring being used to push the movable forming pin away from the rear mold core in the mold-open state, facilitating the placement of the insert in the front mold; the rear mold core is provided with a rear mold positioning pin corresponding to the position of the movable forming pin, and the tops of both the movable forming pin and the rear mold positioning pin are provided with an automatic guide cone feature for docking and centering during mold closing; during mold closing, the insert is transferred from the movable forming pin to the rear mold positioning pin, achieving interchangeable positioning.

[0008] Furthermore, in the mold-open state, the front mold movable insert is pushed out by a stroke of 12.00 mm under the action of spring force, ensuring that the insert is placed on the front side.

[0009] Furthermore, the top diameter of the rear mold positioning pin transitions from the guide cone to the end to the maximum diameter, and the maximum diameter is provided with a rounded corner.

[0010] Furthermore, the front mold core is provided with a guide hole for accommodating the movable forming insert, and the inner wall of the guide hole is clearance-fitted with the outer wall of the movable forming insert.

[0011] Furthermore, the rear mold core is provided with a mounting hole for fixing the rear mold positioning pin, and the rear mold positioning pin is interference-fitted with the mounting hole.

[0012] Furthermore, the spring is a cylindrical helical compression spring, and its free length is greater than the floating stroke of the movable forming insert, ensuring that the movable forming insert can be fully ejected when the mold is opened.

[0013] Furthermore, the insert is made of metal, and its inner wall is precisely fitted with the movable forming insert and the rear mold positioning insert.

[0014] Furthermore, an ejector pin is provided below the rear mold core, which is used to eject the metal insert and product from the rear mold positioning pin after the mold is opened.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention features simple, safe, and reliable operation, ensuring sequential mold opening and repositioning while avoiding complex structures. By completing the insert positioning and interchange in one step, it solves the problem of sticking to the front mold, enabling smooth product demolding, automated production, improved production efficiency, and savings in manpower and resources. Attached Figure Description

[0017] Figure 1 Schematic diagram of the product and metal inserts

[0018] Figure 2 A schematic diagram showing the alignment of the product and metal inserts with the mold.

[0019] Figure 3 This is a schematic diagram showing the metal inserts of the product being attached to the front mold insert pins during mold opening;

[0020] Figure 4 This is a structural diagram showing the initial placement and positioning of the metal inserts and the product demolding process.

[0021] Figure 5 A schematic diagram of the positioning mold structure for interchangeable inserts and the placement and positioning of the front mold metal insert;

[0022] Figure 6 A schematic diagram of the positioning mold structure for interchangeable inserts and the placement and positioning of the metal inserts in the rear mold;

[0023] Figure 7 A schematic diagram showing how the product and metal insert can be smoothly ejected after the design of the interchangeable insert positioning mold structure. Detailed Implementation

[0024] To make this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0025] like Figures 5 to 7As shown, this utility model discloses an interchangeable insert positioning mold structure, including a front mold base, a front mold core 3, a rear mold core 5, an insert 1, a rear mold core pin 6, a spring 8, and a movable forming pin 4 inside the front mold core 3. The movable forming pin 4 has a floating stroke, and a spring 8 is added to the bottom to ensure stability and consistency. In the mold-open state, the spring 8 pushes out the movable forming pin 4, making it easy to place the metal insert 10 in the front mold. This retains the initial design concept and can avoid collision damage between the metal insert 10 and the side wall of the front mold core. A new rear mold metal insert positioning pin part is added. An automatic guide cone feature is designed on the top of the front and rear mold pin parts. When the front and rear molds are closed, they automatically align and find the center of the front and rear mold pins. At the same time, the maximum diameter of the top of the rear mold pin is rounded, ensuring that the positioning of the metal insert is smoothly interchanged from the front mold movable pin 4 to the rear mold pin. At this time, the front mold movable pin 4 retracts 12.0mm to complete the positioning replacement action, so that the metal insert 10 is removed from the positioning area of ​​the front mold movable pin 4. After the molding process is completed, the product and the metal insert 10 are left in the rear mold, which effectively solves the problem of sticking and damage caused by the positioning pins of the metal insert in the front mold. Finally, the product is successfully ejected by the rear mold ejection system, reducing the defect rate and meeting the requirements of normal mass production.

[0026] This utility model is an interchangeable insert positioning mold structure, such as Figure 1 As shown in Figure 2, it includes a molded product and a metal insert 1, as well as the positioning method of the metal insert. For example... Figure 3 As shown, it includes a front mold core 3, and the interior of the front mold core 3 has a movable molding insert. After molding, when the mold is opened, the product sticks to the front mold with the metal insert 10, resulting in defective products. Figure 4 As shown, this is the initial mold structure for placing and positioning the metal inserts. Because the sidewalls of the metal inserts need to be close to the front mold core, the inserts are designed to be placed on the front mold side to avoid collisions that could damage the front mold. Additionally, movable insert pins 4 were designed to reduce the risk of sticking to the front mold. However, in production, this still failed to effectively solve the problem of the four metal inserts sticking to the front mold. After trying various adjustment schemes such as adding undercuts to the rear mold side, the defect rate of products produced by this mold remained high.

[0027] To solve the above problems, such as Figure 5 As shown in the mold opening state, in accordance with the product functional requirements and without changing the placement side of the metal insert, the bottom mold frame part 7 of the front mold movable insert 4 is opened to place the spring 8. When the mold is open, the front mold movable insert 4 is pushed out by a stroke of 12.00mm under the action of the spring force, ensuring that the metal insert is placed on the front side, effectively avoiding the risk of damage to the mold by the metal insert and the mold core in the breakage area.

[0028] like Figure 6In the mold closing state shown, a rear mold insert pin 6 is added to the rear mold insert 5. An automatic guide cone feature is designed on the top of the movable forming insert pin 4 and the rear mold insert pin 6. When the front and rear molds are closed, they automatically align and find the center of the front and rear mold insert pins. At the same time, the maximum diameter of the top of the rear mold insert pin is rounded to ensure that the positioning of the metal insert is smoothly exchanged from the movable insert pin of the front mold to the insert pin of the rear mold. At this time, the movable insert pin of the front mold moves back 12.0mm to complete the positioning replacement action, so that the metal insert is removed from the positioning area of ​​the movable insert pin of the front mold.

[0029] like Figure 7 After the molding process is completed, the molded product and metal insert are left in the back mold. The ejector pin 9 ejects the product and metal insert 10 smoothly through the conventional ejection action, thereby effectively solving the problem of the metal insert sticking to the front and ensuring normal mass production of the mold.

[0030] This invention makes adjustments to the positioning method of metal inserts, avoids many unsafe factors of molds, realizes automated production, and greatly improves production efficiency.

[0031] The above embodiments are merely preferred embodiments of this utility model. Any modifications, equivalent substitutions, or improvements made within the scope of the principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An interchangeable insert positioning mold structure, characterized in that, The system includes a front mold base, a front mold core, a rear mold core, an insert, a rear mold positioning pin, a spring, and a movable forming pin located within the front mold core. The movable forming pin has a floating stroke along its axial direction, and a spring is installed between its bottom and the front mold core. The spring is used to push the movable forming pin away from the rear mold core when the mold is open, facilitating the placement of the insert in the front mold. The rear mold core has a rear mold positioning pin corresponding to the position of the movable forming pin. The tops of both the movable forming pin and the rear mold positioning pin have an automatic guide cone feature for docking and centering during mold closing. During mold closing, the insert is transferred from the movable forming pin to the rear mold positioning pin, achieving positional interchange.

2. The interchangeable insert positioning mold structure according to claim 1, characterized in that, When the mold is open, the movable molding insert is pushed out by a stroke of 12.00 mm under the action of spring force, ensuring that the insert is placed on the front side.

3. The interchangeable insert positioning mold structure according to claim 1, characterized in that, The top diameter of the rear mold positioning pin transitions from the guide cone to the end to the maximum diameter, and the maximum diameter is provided with a rounded corner.

4. The interchangeable insert positioning mold structure according to claim 1, characterized in that, The front mold core is provided with a guide hole for accommodating the movable forming insert, and the inner wall of the guide hole is clearance-fitted with the outer wall of the movable forming insert.

5. The interchangeable insert positioning mold structure according to claim 1, characterized in that, The rear mold core is provided with a mounting hole for fixing the rear mold positioning pin, and the rear mold positioning pin is interference-fitted with the mounting hole.

6. The interchangeable insert positioning mold structure according to claim 1, characterized in that, The spring is a cylindrical helical compression spring, and its free length is greater than the floating stroke of the movable forming insert, ensuring that the movable forming insert can be completely pushed out when the mold is opened.

7. The interchangeable insert positioning mold structure according to claim 1, characterized in that, The insert is made of metal, and its inner wall is precisely fitted with the movable forming insert and the rear mold positioning insert.

8. The interchangeable insert positioning mold structure according to claim 1, characterized in that, The rear mold core is provided with ejector pins, which are used to eject the metal inserts and products from the rear mold positioning pins after the mold is opened.

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