An automatic insert-molding mold structure and production method for insert-molded products

Abstract

This invention discloses an in-mold automatic insert placement mold structure and production method for injection molded products with inserts, relating to the field of injection mold technology. This in-mold automatic insert placement mold structure and production method for injection molded products with inserts produces injection molded products containing inserts by setting an automatic insert placement mold structure within the mold. Compared to the traditional method of using a robotic arm to insert the insert into the mold, this eliminates the need for an additional robotic arm, saving equipment costs, reducing the time spent by the robotic arm unloading material, decreasing equipment footprint, improving production efficiency, avoiding the need for equipment debugging that simultaneously controls mold opening and closing and robotic arm movements, and eliminating the need for manual maintenance of the robotic arm later, thus saving labor costs.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and in particular to an in-mold automatic insert placement mold structure and production method for injection molded products with inserts. Background Technology

[0002] Currently, the production of cup lid rotating rings for injection-molded products with inserts typically employs a "secondary injection molding + robotic insertion" process. The specific steps are as follows: First injection molding: a semi-finished product (without inserts) made of POM substrate is injected into the mold cavity; Mold opening and part removal: after the mold is opened, the inserts are placed into the preset slots of the semi-finished product using a robotic arm; Second injection and encapsulation: the semi-finished product with inserts is placed back into the mold, and after the mold is closed, POM material is injected to encapsulate the inserts, forming a complete product.

[0003] The mold and production process have the following technical defects: (1) High equipment cost: It is necessary to configure a robot arm to pick up and put in the inserts; (2) Long production cycle: After the mold is opened, the robot arm needs 8-15 seconds to pick up and put in the inserts, which leads to the extension of the single mold production cycle; (3) High operation complexity and high labor cost: It is difficult to debug the equipment by controlling the mold opening and closing and the robot arm movement simultaneously, and a dedicated person is required to maintain the robot arm, which increases the labor cost. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides an in-mold automatic insert placement mold structure and production method for injection molded products with inserts, so as to solve the problems of high cost, long production cycle, high operation complexity and high labor cost of existing injection molds and production process equipment.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an in-mold automatic insert placement mold structure for injection molded products with inserts, comprising:

[0006] A fixed mold, comprising a first fixed template and a second fixed template, wherein the first fixed template can move closer to or further away from the second fixed template, and the first fixed template comprises a first fixed module and a second fixed module;

[0007] The moving mold includes a first moving template and a second moving template. The first moving template can move closer to or away from the second moving template. The first moving template includes a first moving module and a second moving module with the same shape and size.

[0008] The first insert and the second insert are both fixed to the second movable template and both penetrate the first movable template;

[0009] An insert feeding mechanism includes a guide insert and a conveying assembly disposed in a first fixed template, and a core-removing insert disposed on a second fixed template. One end of the guide insert passes through the first fixed template and has a guide channel.

[0010] When the fixed mold and the moving mold are closed, the first fixed module, the guide insert, the core-removing insert, the insert, the first insert, and the first moving module or the second moving module form a first injection cavity, and the second fixed module, the second insert, and the first moving module or the second moving module form a second injection cavity;

[0011] After the conveying assembly conveys the insert to the material guide channel, during the mold closing process of the first fixed template and the second fixed template, the core-removing insert passes through the first fixed template and pushes the insert into the first injection cavity to abut against the first insert.

[0012] Preferably, the conveying assembly includes a conveying pipe, an elastic element, a slider, a push rod, and a shovel base block. The elastic element is fixed inside the first fixed template. The push rod is fixedly connected to one side of the slider, and the elastic element is fixedly connected to the side of the slider facing away from the push rod. The shovel base block is fixed to the second fixed template and moves through the slider. During the mold closing or opening process of the first and second fixed templates, the shovel base block drives the slider to move along a direction perpendicular to the guide insert. When the first and second fixed templates open and the shovel base block disengages from the slider, the elastic element rebounds and generates a rebound force to push the slider to move, causing the push rod to push the insert onto the core-removing insert.

[0013] Preferably, the slider has a >-shaped groove, which has an upper contact surface and a lower contact surface.

[0014] Preferably, both the first insert and the second insert are rod-shaped and have the same cross-sectional size. One end of the first insert is provided with a first limiting support groove for limiting and supporting the insert.

[0015] Preferably, the core-removing insert is rod-shaped, the size of the core-removing insert is adapted to the size of the material guide channel, and a second limiting support groove is provided at one end of the core-removing insert.

[0016] A method for producing injection-molded products with inserts, employing the aforementioned in-mold automatic insert placement mold structure, includes the following steps:

[0017] Step 1: Insert loading:

[0018] The first fixed mold and the second fixed mold are opened. The insert is conveyed to the guide channel by the conveying component. The first fixed mold and the first moving mold are closed. The first fixed mold and the second fixed mold are closed. The insert in the guide channel is pushed into the first injection cavity and abuts against the first insert by the core-removing insert. At this time, the insert in the first injection cavity is not completely wrapped.

[0019] Step Two: Semi-finished Product Shaping

[0020] Molten plastic material is injected into the first injection cavity through the barrel of the first injection molding machine via a one-shot gating system to form the first injection molded part on the insert, thus forming a semi-finished product;

[0021] Step 3: In-mold core rotation:

[0022] The first fixed template and the second fixed template open the mold, and the insert is conveyed into the guide channel by the conveying component. The first fixed template and the first moving template open the mold, and the first moving template and the second moving template open the mold. The first moving template is driven to rotate 180°, so that the positions of the first moving module and the second moving module on the first moving template are exchanged, while the positions of the first insert and the second insert on the second moving template remain unchanged, so that the semi-finished product on the first moving template is facing the second fixed module. Then the first moving template and the second moving template close the mold.

[0023] Step 4: Insert loading:

[0024] The first fixed mold plate and the first moving mold plate are closed together. The first fixed mold plate and the second fixed mold plate are closed together. The insert in the guide insert is pushed into the first injection cavity and abuts against the first insert through the core ejector insert. At this time, the insert in the first injection cavity is not completely wrapped, and there is a distance between the insert in the semi-finished product and the second insert.

[0025] Step 5: Finished Product Shaping and Semi-finished Product Shaping

[0026] Molten plastic material is injected into the first injection cavity through the barrel of the first injection molding machine via a single-shot gating system to form the first injection molded part on the insert, forming a semi-finished product. At the same time, molten plastic material is injected into the second injection cavity through the barrel of the second injection molding machine via a double-shot gating system to form the second injection molded part on the semi-finished product in the second injection cavity, forming the finished product. At this time, the second injection molded part, together with the first injection molded part, completely encapsulates the insert.

[0027] Step Six: Finished Product Cutting:

[0028] After holding pressure, the mold is opened, and the ejection mechanism ejects the finished product completed in the second injection. The five-axis robot installed on the first injection machine is controlled to move to the second injection position and take out the finished product.

[0029] Then repeat steps three, four, five, and six.

[0030] Preferably, the first injection molded part has a third limiting support groove for supporting the insert and a through hole that matches the cross-sectional size of the first insert. The third limiting support groove communicates with the through hole. The opening length of the through hole is greater than the opening length of the third limiting support groove, and the opening width of the through hole is less than the opening width of the third limiting support groove. When the insert is located on the third limiting support groove, there is a gap between the insert and the inner wall of the through hole.

[0031] Preferably, it also includes a core-rotating mechanism, which includes a rotating rod, a hydraulic cylinder, a rack, and a gear. The gear is fixedly installed on the outer surface of the rotating rod, and the rack is fixedly installed on the output end of the hydraulic cylinder. The rack meshes with the gear, and one end of the rotating rod is fixedly connected to the first moving template.

[0032] Preferably, the first injection molding machine and the second injection molding machine are arranged vertically.

[0033] Compared with the prior art, the beneficial effects that this invention can achieve are:

[0034] This invention produces injection molded products containing inserts by setting an automatic insert placement mold structure inside the mold. Compared with the traditional method of using a robot to insert the inserts into the mold, it eliminates the need for an additional robot, saving equipment costs, reducing the time for robot to unload materials, reducing equipment footprint, improving production efficiency, avoiding the need for equipment debugging that synchronizes mold opening and closing with robot movements, and eliminating the need for manual maintenance of the robot later, thus saving labor costs. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the fixed mold, moving mold, first injection molding machine, second injection molding machine, and five-axis robot of the present invention.

[0036] Figure 2 This is a schematic diagram of the fixed mold and moving mold structure of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of the first fixed template, the first fixed module, the second fixed module, and the second fixed template of the present invention;

[0038] Figure 4 For the present invention Figure 3 Schematic diagram of the structure at point A in the middle;

[0039] Figure 5 This is a schematic diagram showing the structural state of the material guide insert, the core removal insert, and the conveying assembly when the first and second fixed templates of the present invention are closed.

[0040] Figure 6 This is a schematic diagram of the structural state of the material guide insert, the core removal insert, and the conveying assembly when the first and second fixed templates of the present invention are slightly opened.

[0041] Figure 7 This is a schematic diagram showing the structural state of the material guide insert, the core removal insert, and the conveying assembly when the first and second fixed templates of the present invention are fully opened.

[0042] Figure 8 This is a schematic diagram of the material guiding insert, material guiding channel, core removal insert, second limiting support groove and insert structure of the present invention;

[0043] Figure 9This is a schematic diagram of the structure of the first moving template, the first moving module, the second moving module, and the second moving template when the present invention is not injection molded;

[0044] Figure 10 For the present invention Figure 9 Schematic diagram of the structure at point B;

[0045] Figure 11 For the present invention Figure 9 Schematic diagram of the structure at point C;

[0046] Figure 12 This is a schematic diagram of the structural state of the first and second moving templates when the mold is opened according to the present invention;

[0047] Figure 13 This is a schematic diagram of the structure of the first moving template, the first moving module, the second moving module, and the second moving template when the semi-finished product is injection molded according to the present invention.

[0048] Figure 14 This is a schematic diagram of the structure of the first moving template, the first moving module, the second moving module, and the second moving template when the present invention is used to mold a semi-finished product by one injection and a finished product by two injections.

[0049] Figure 15 For the present invention Figure 14 Schematic diagram of the structure at point D;

[0050] Figure 16 For the present invention Figure 14 Schematic diagram of the structure at point E in the middle;

[0051] Figure 17 This is a schematic diagram of the structure of the first injection molded part, the through hole, and the third limiting support groove of the present invention;

[0052] Figure 18 This is a schematic diagram of the semi-finished product structure composed of the first injection molded part and the insert of the present invention;

[0053] Figure 19 This is a schematic diagram of the finished structure of the rotating ring of the cup lid according to the present invention;

[0054] Figure 20 This is a schematic diagram of the structure of the second injection molded part of the present invention;

[0055] Figure 21 This is a schematic diagram of the first moving template, hydraulic cylinder, rack, rotating rod, and gear structure of the present invention;

[0056] Wherein: 1. First injection molded part; 101. Through hole; 102. Third limiting support groove; 2. Insert; 3. Second injection molded part; 4. Fixed mold; 41. First fixed template; 411. First fixed module; 412. Second fixed module; 42. Second fixed template; 5. Moving mold; 51. First moving template; 511. First moving module; 5111. Moving mold core; 5112. Sliding part; 512. Second moving module; 52. Second moving template; 6. Material guide insert; 61. Material guide channel; 7. 71. Core-removing insert; 8. Second limiting support groove; 9. Conveying assembly; 10. Conveying pipe; 11. Push rod; 12. Elastic element; 13. Slider; 14. >-shaped groove; 15. Upper contact surface; 16. Lower contact surface; 17. Shovel base block; 18. First insert; 18. First limiting support groove; 19. Second insert; 10. First injection molding machine; 11. Second injection molding machine; 12. Five-axis robot; 13. Hydraulic cylinder; 14. Rack; 15. Rotating rod; 16. Gear. Detailed Implementation

[0057] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention is further described below in conjunction with specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of this invention.

[0058] like Figures 2-16 As shown, the present invention provides an in-mold automatic insert loading mold structure for injection molded products with inserts, including a fixed mold 4, a moving mold 5, a first insert 9, a second insert 10, and an insert loading mechanism (the inserts 2 here are all magnetic inserts 2).

[0059] like Figure 2 , Figure 3 and Figure 4 As shown, the fixed mold 4 includes a first fixed template 41 and a second fixed template 42. The first fixed template 41 can move closer to or further away from the second fixed template 42. The first fixed template 41 includes a first fixed module 411 and a second fixed module 412.

[0060] like Figure 2 , Figure 9 , Figure 12 , Figure 13 and Figure 14 The moving template 5 includes a first moving template 51 and a second moving template 52. The first moving template 51 can move closer to or away from the second moving template 52. The first moving template 51 includes a first moving module 511 and a second moving module 512 with the same shape and size.

[0061] The mold opening between the first fixed template 41 and the second fixed template 42, as well as the mold opening between the first fixed template 41 and the first moving template 51, follows the existing three-plate mold opening principle, which will not be elaborated here.

[0062] like Figure 9 , Figure 10 , Figure 11 and Figure 12 As shown, the first insert 9 and the second insert 10 are both fixed on the second movable template 52 and both penetrate the first movable template 51;

[0063] like Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the insert feeding mechanism includes a guide insert 6 and a conveying assembly 8 disposed in the first fixed template 41, and a core-removing insert 7 disposed on the second fixed template 42. One end of the guide insert 6 passes through the first fixed template 411 and has a guide channel 61.

[0064] When the fixed mold 4 and the moving mold 5 are closed, the first fixed module 411, the guide insert 6, the core ejector insert 7, the insert 2, the first insert 9 and the first moving module 511 or the second moving module 512 form the first injection cavity, and the second fixed module 412, the second insert 10 and the first moving module 511 or the second moving module 512 form the second injection cavity;

[0065] After the conveying assembly 8 conveys the insert 2 to the material guide channel 61, during the mold closing process of the first fixed template 41 and the second fixed template 42, the core-removing insert 7 passes through the first fixed template 411 and pushes the insert 2 into the first injection cavity to abut against the first insert 9.

[0066] The following uses the injection molded product with insert 2 as an example. Figure 19 Taking the cup lid rotating ring shown as an example: The cup lid rotating ring includes a first injection molded part 1, a second injection molded part 3, and a magnetic insert 2 located between the first injection molded part 1 and the second injection molded part 3. Each cup lid rotating ring is encapsulated with two magnetic inserts 2. The cup lid rotating ring is injection molded in two stages.

[0067] A method for producing an injection molded product with insert 2 (cup lid rotating ring), employing an in-mold automatic insert 2 mold structure, includes the following steps:

[0068] Step 1: Loading Insert 2:

[0069] The first fixed mold plate 41 and the second fixed mold plate 42 are opened, and the insert 2 is conveyed into the guide channel 61 by the conveying assembly 8 (e.g., ...). Figure 6 As shown), the first fixed mold plate 41 and the first moving mold plate 51 close together, and the first fixed mold plate 41 and the second fixed mold plate 42 close together. The insert 2 in the guide channel 61 is pushed into the first injection cavity and abuts against the first insert 9 through the core ejector insert 7 (as shown). Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown in the figure, at this time the insert 2 in the first injection cavity is not completely wrapped;

[0070] Step Two: Semi-finished Product Shaping

[0071] like Figure 1 As shown, molten plastic material is injected into the first injection cavity through the barrel of the first injection molding machine 11 via a one-shot gating system to form the first injection molded part 1 on the insert 2, thus forming a semi-finished product (such as...). Figure 13 , Figure 18 (as shown)

[0072] Step 3: In-mold core rotation:

[0073] The first fixed mold plate 41 and the second fixed mold plate 42 are opened, and the insert 2 is conveyed into the guide channel 61 by the conveying assembly 8 (e.g., ...). Figure 6 As shown), the first fixed template 41 and the first movable template 51 open to each other, and the first movable template 51 and the second movable template 52 open to each other. The first movable template 51 is driven to rotate 180°, so that the positions of the first movable module 511 and the second movable module 512 on the first movable template 51 are interchanged, while the positions of the first insert 9 and the second insert 10 on the second movable template 52 remain unchanged (as shown). Figure 12 As shown), the semi-finished product on the first moving template 51 is aligned with the second fixed template 412, and then the first moving template 51 and the second moving template 52 are closed.

[0074] like Figure 21 As shown, it also includes a core-rotating mechanism, which includes a rotating rod 16, a hydraulic cylinder 14, a rack 15 and a gear 17. The gear 17 is fixedly installed on the outer surface of the rotating rod 16, and the rack 15 is fixedly installed on the output end of the hydraulic cylinder 14. The rack 15 meshes with the gear 17, and one end of the rotating rod 16 is fixedly connected to the first moving template 51.

[0075] The cylinder 14 drives the rack 15 to move, the rack 15 drives the gear 17 to rotate, the gear 17 drives the rotating rod 16 to rotate, thereby ultimately driving the first moving template 51 to rotate 180°, so that the positions of the first moving module 511 and the second moving module 512 on the first moving template 51 are swapped.

[0076] Step 4: Insert 2 loading:

[0077] The first fixed mold plate 41 and the first moving mold plate 51 are closed, and the first fixed mold plate 41 and the second fixed mold plate 42 are closed. The insert 2 in the guide insert 6 is pushed into the first injection cavity by the core ejector insert 7 and abuts against the first insert 9 (e.g., Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown), at this time, the insert 2 in the first injection cavity is not completely wrapped, and there is a distance between the insert 2 in the semi-finished product and the second insert 10;

[0078] Step 5: Finished Product Shaping and Semi-finished Product Shaping

[0079] Molten plastic material is injected into the first injection cavity through the barrel of the first injection molding machine 11 via a one-shot gating system to form the first injection molded part 1 on the insert 2, thus forming a semi-finished product (such as...). Figure 1 , Figure 14 , Figure 18 As shown), molten plastic material is simultaneously injected into the second injection cavity through the barrel of the second injection molding machine 12 via a two-shot gating system. The second injection molded part 3 is then injection molded onto the semi-finished product within the second injection cavity, forming the finished product (as shown). Figure 2 , Figure 14 , Figure 19 As shown), at this time, the second injection molded part 3, together with the first injection molded part 1, completely encloses the insert 2;

[0080] Specifically, both the first moving module 511 and the second moving module 512 here include a moving mold core 5111 and a sliding component 5112. After the finished product is formed by two-shot injection molding, the two sliding components 5112 at the two-shot position can move away from each other through the shovel base structure (the shovel base structure is a common existing technology in molds, which will not be described in detail here), thereby facilitating the subsequent unloading of the finished product.

[0081] Step Six: Finished Product Cutting:

[0082] like Figure 1 As shown, after holding pressure, the mold is opened, and the ejection mechanism ejects the finished product completed by the second injection. The five-axis robot 13 installed on the first injection machine 11 is controlled to move to the second injection position and take out the finished product.

[0083] Then repeat steps three, four, five, and six.

[0084] By adopting the above-mentioned mold structure with automatic insert 2 set in the mold to produce injection molded products containing insert 2, compared with the traditional mode of using a robot to insert 2 into the mold, there is no need to set up an additional robot, saving equipment costs, saving the time of robot unloading, reducing the equipment footprint, improving production efficiency, avoiding the need for equipment debugging that synchronously controls the mold opening and closing and the robot's movements, avoiding the need for manual maintenance of the robot later, and saving labor costs.

[0085] like Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the conveying assembly 8 includes a conveying pipe 81, an elastic element 83 (which can be a spring), a slider 84, a push rod 82, and a shovel base block 85. The elastic element 83 is fixed inside the first fixed template 411. The push rod 82 is fixedly connected to one side of the slider 84, and the elastic element 83 is fixedly connected to the side of the slider 84 facing away from the push rod 82. The shovel base block 85 is fixed on the second fixed template 42 and moves through the slider 84. During the mold closing or opening process of the first fixed template 41 and the second fixed template 42, the shovel base block 85 drives the slider 84 to move along a direction perpendicular to the guide insert 6. When the first fixed template 41 and the second fixed template 42 open the mold and the shovel base block 85 disengages from the slider 84, the elastic element 83 rebounds and generates a rebound force to push the slider 84 to move, causing the push rod 82 to push the insert 2 onto the core-removing insert 7.

[0086] With the conveying component 8 configured in this way, the magnetic insert 2 can be automatically fed during the mold closing or opening process of the first fixed template 41 and the second fixed template 42. This eliminates the need for an additional robotic arm, saving equipment costs, reducing the time required for the robotic arm to unload materials, decreasing the equipment footprint, and improving production efficiency.

[0087] like Figure 7 As shown, the slider 84 has a >-shaped groove 841, which has an upper contact surface 8411 and a lower contact surface 8412.

[0088] When the first fixed mold plate 41 and the second fixed mold plate 42 slightly open, the spade base block 85 slides along the upper contact surface 8411, causing the position state of the slider 84 and the spade base block 85 to change from... Figure 5 State transformation Figure 6 In the state, the shovel base block 85 drives the slider 84 to move away from the guide insert 6. At this time, the elastic element 83 is in a compressed state, and the push rod 82 will not block the discharge end of the conveying pipe 81. The insert 2 can be sent into the conveying pipe 81 through the vibrating hopper, thereby squeezing the insert 2 at the discharge end of the conveying pipe 81 to face the push rod 82.

[0089] The first fixed mold plate 41 and the second fixed mold plate 42 are fully opened, and the spade base block 85 disengages from the slider 84, so that the positional state of the slider 84 and the spade base block 85 changes from... Figure 6 State transformation Figure 7 In this state, the elastic element 83 rebounds and generates a rebound force, driving the slider 84 to move closer to the guide insert 6, thereby causing the push rod 82 to push the insert 2 facing the discharge end of the conveying pipe 81 into the guide channel 61 of the guide insert 6 and fall onto the core-removing insert 7.

[0090] Subsequently, as the first fixed mold plate 41 and the second fixed mold plate 42 gradually close, the core ejector insert 7 drives the insert 2 to slide into the first injection cavity within the guide channel 61 and abut against the first insert 9. Simultaneously, the spade block 85 moves closer to the slider 84, contacting the lower contact surface 8412. This causes the spade block 85 to drive the slider 84 away from the guide insert 6. At this time, the elastic element 83 is in a compressed state. Then, the spade block 85 contacts the upper contact surface 8411 until the elastic element 83 returns to its original length. That is, the positional states of the core ejector insert 7, the slider 84, and the spade block 85 change from... Figure 7 State transformation Figure 5 and Figure 8 The status is thus completed, thereby completing the automatic feeding of insert 2.

[0091] It should be noted that by simply changing the dimensions of the guide channel 61, the core-removing insert 7, and the conveying pipe 81, it is possible to adapt to magnet inserts 2 of different diameters, and it is suitable for various cup lid rotating rings or similar magnetic insert products.

[0092] like Figure 10 , Figure 11 and Figure 12 As shown, both the first insert 9 and the second insert 10 are rod-shaped and have the same cross-sectional size. One end of the first insert 9 is provided with a first limiting support groove 91 for limiting and supporting the insert 2.

[0093] Here, the magnet insert 2 is set as a cylinder, and the first limiting support groove 91 is set as an arc groove. So when the core removal insert 7 drives the insert 2 to slide into the first injection cavity in the material guide channel 61 and abut against the first insert 9, the first insert 9 plays a stable limiting support role for the magnet insert 2, thereby improving the accuracy of the placement position of the magnet insert 2.

[0094] like Figure 8 As shown, the core-removing insert 7 is rod-shaped, and the size of the core-removing insert 7 is adapted to the size of the guide channel 61. A second limiting support groove 71 is provided at one end of the core-removing insert 7. The second limiting support groove 71 here is also an arc-shaped groove, so that the magnet insert 2 is stably positioned between the core-removing insert 7 and the first insert 9.

[0095] like Figure 17 , Figure 18 , Figure 19 and Figure 20As shown, the first injection molded part 1 has a third limiting support groove 102 for supporting the insert 2 and a through hole 101 that matches the cross-sectional size of the first insert 9. The third limiting support groove 102 is connected to the through hole 101. The length of the opening of the through hole 101 is greater than the length of the opening of the third limiting support groove 102, and the width of the opening of the through hole 101 is less than the width of the opening of the third limiting support groove 102. When the insert 2 is located on the third limiting support groove 102, there is a gap between the insert 2 and the inner wall of the through hole 101. That is, the thickness of the first insert 9 is less than the thickness of the magnet insert 2, and the width of the first insert 9 is greater than the diameter of the cylindrical magnet insert 2.

[0096] By setting this gap, it is ensured that when molten plastic material is injected into the second injection cavity through the barrel of the second injection molding machine 12 via the two-shot gating system, and the second injection molded part 3 is injection molded onto the semi-finished product in the second injection cavity to form the finished product (e.g. Figure 19 The second injection molded part 3, together with the first injection molded part 1, completely encloses the insert 2.

[0097] like Figure 1 As shown, the first injection molding machine 11 and the second injection molding machine 12 are arranged vertically. The two ordinary injection molding machines arranged in this way have lower equipment costs compared to existing dual-injection injection molding machines.

[0098] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An in-mold automatic insert placement mold structure for injection molded products with inserts, characterized in that, include: The fixed mold (4) includes a first fixed template (41) and a second fixed template (42). The first fixed template (41) can move closer to or further away from the second fixed template (42). The first fixed template (41) includes a first fixed module (411) and a second fixed module (412). The moving mold (5) includes a first moving template (51) and a second moving template (52). The first moving template (51) can move closer to or further away from the second moving template (52). The first moving template (51) includes a first moving module (511) and a second moving module (512) of the same shape and size. The first insert (9) and the second insert (10) are both fixed on the second moving template (52) and both penetrate the first moving template (51). The insert feeding mechanism includes a guide insert (6) and a conveying assembly (8) disposed in the first fixed template (41) and a core-removing insert (7) disposed on the second fixed template (42). One end of the guide insert (6) passes through the first fixed template (411) and has a guide channel (61). When the fixed mold (4) and the moving mold (5) are closed, the first fixed module (411), the guide insert (6), the core ejector insert (7), the insert (2), the first insert (9) and the first moving module (511) or the second moving module (512) form the first injection cavity, and the second fixed module (412), the second insert (10) and the first moving module (511) or the second moving module (512) form the second injection cavity; After the conveying assembly (8) conveys the insert (2) to the material guide channel (61), during the mold closing process of the first fixed template (41) and the second fixed template (42), the core-removing insert (7) passes through the first fixed template (411) and pushes the insert (2) into the first injection cavity to abut against the first insert (9).

2. The in-mold automatic insert placement mold structure for injection molded products with inserts according to claim 1, characterized in that: The conveying assembly (8) includes a conveying pipe (81), an elastic element (83), a slider (84), a push rod (82), and a shovel base block (85). The elastic element (83) is fixed inside the first fixed module (411). The push rod (82) is fixedly connected to one side of the slider (84), and the elastic element (83) is fixedly connected to the side of the slider (84) facing away from the push rod (82). The shovel base block (85) is fixed on the second fixed template (42), and the shovel base block (85) movably passes through the slider. (84) During the mold closing or opening process of the first fixed template (41) and the second fixed template (42), the shovel base block (85) drives the slider (84) to move along the direction perpendicular to the guide insert (6). When the first fixed template (41) and the second fixed template (42) open the mold and the shovel base block (85) disengages from the slider (84), the elastic element (83) rebounds and generates a rebound force to push the slider (84) to move, so that the push rod (82) pushes the insert (2) onto the core-removing insert (7).

3. The in-mold automatic insert placement mold structure for injection molded products with inserts according to claim 2, characterized in that: The slider (84) has a >-shaped groove (841) with an upper contact surface (8411) and a lower contact surface (8412).

4. The in-mold automatic insert placement mold structure for injection molded products with inserts according to claim 2, characterized in that: The first insert (9) and the second insert (10) are both rod-shaped and have the same cross-sectional size. One end of the first insert (9) is provided with a first limiting support groove (91) for limiting support insert (2).

5. The in-mold automatic insert placement mold structure for injection molded products with inserts according to claim 2, characterized in that: The core-removing insert (7) is rod-shaped, and the size of the core-removing insert (7) is adapted to the size of the material guide channel (61). A second limiting support groove (71) is provided at one end of the core-removing insert (7).

6. A method for producing an injection-molded product with inserts, characterized in that, The in-mold automatic insert placement mold structure according to any one of claims 1 to 5 includes the following steps: Step 1: Insert (2) Loading: The first fixed template (41) and the second fixed template (42) open the mold, and the insert (2) is conveyed to the guide channel (61) through the conveying component (8). The first fixed template (41) and the first moving template (51) close the mold. The first fixed template (41) and the second fixed template (42) close the mold. The insert (2) in the guide channel (61) is pushed into the first injection cavity and abuts against the first insert (9) through the core-removing insert (7). At this time, the insert (2) in the first injection cavity is not completely wrapped. Step Two: Semi-finished Product Shaping Molten plastic material is injected into the first injection cavity through the barrel of the first injection molding machine (11) via a one-shot gating system to form the first injection molded part (1) on the insert (2), thus forming a semi-finished product; Step 3: In-mold core rotation: The first fixed template (41) and the second fixed template (42) are opened. The insert (2) is conveyed to the guide channel (61) through the conveying component (8). The first fixed template (41) and the first moving template (51) are opened. The first moving template (51) and the second moving template (52) are opened. The first moving template (51) is driven to rotate 180°, so that the positions of the first moving module (511) and the second moving module (512) on the first moving template (51) are exchanged, while the positions of the first insert (9) and the second insert (10) on the second moving template (52) remain unchanged, so that the semi-finished product on the first moving template (51) faces the second fixed module (412). Then the first moving template (51) and the second moving template (52) are closed. Step 4: Insert (2) Loading: The first fixed template (41) and the first moving template (51) are closed, and the first fixed template (41) and the second fixed template (42) are closed. The insert (2) in the guide insert (6) is pushed into the first injection cavity and abuts against the first insert (9) by the core ejector insert (7). At this time, the insert (2) in the first injection cavity is not completely wrapped, and there is a distance between the insert (2) in the semi-finished product and the second insert (10). Step 5: Finished Product Shaping and Semi-finished Product Shaping Molten plastic material is injected into the first injection cavity through the barrel of the first injection molding machine (11) via a single injection gating system to form the first injection molded part (1) on the insert (2), forming a semi-finished product. At the same time, molten plastic material is injected into the second injection cavity through the barrel of the second injection molding machine (12) via a double injection gating system to form the second injection molded part (3) on the semi-finished product in the second injection cavity, forming the finished product. At this time, the second injection molded part (3) and the first injection molded part (1) completely enclose the insert (2). Step Six: Finished Product Cutting: After holding pressure, the mold is opened, and the ejection mechanism ejects the finished product completed by the second injection. The five-axis robot (13) installed on the first injection machine (11) is controlled to move to the second injection position and take out the finished product. Then repeat steps three, four, five, and six.

7. The method for producing an injection-molded product with inserts according to claim 6, characterized in that: The first injection molded part (1) has a third limiting support groove (102) for supporting the insert (2) and a through hole (101) that matches the cross-sectional size of the first insert (9). The third limiting support groove (102) is connected to the through hole (101). The length of the opening of the through hole (101) is greater than the length of the opening of the third limiting support groove (102). The width of the opening of the through hole (101) is less than the width of the opening of the third limiting support groove (102). When the insert (2) is located on the third limiting support groove (102), there is a gap between the insert (2) and the inner wall of the through hole (101).

8. The method for producing an injection-molded product with inserts according to claim 6, characterized in that: It also includes a core-rotating mechanism, which includes a rotating rod (16), a hydraulic cylinder (14), a rack (15) and a gear (17). The gear (17) is fixedly installed on the outer surface of the rotating rod (16), and the rack (15) is fixedly installed at the output end of the hydraulic cylinder (14). The rack (15) meshes with the gear (17), and one end of the rotating rod (16) is fixedly connected to the first moving template (51).

9. The method for producing an injection-molded product with inserts according to claim 6, characterized in that: The first injection molding machine (11) and the second injection molding machine (12) are arranged vertically.

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