Shaft injection mold

Abstract

The utility model belongs to the technical field of injection molding equipment, and particularly relates to a shaft injection mold which comprises an upper mold plate, a runner insert plate, an upper mold bottom plate and a lower mold, the runner insert plate is arranged at the bottom of the upper mold plate, the upper mold bottom plate is arranged at the bottom of the runner insert plate, the lower mold is arranged at the bottom of the upper mold bottom plate, and the runner insert plate is arranged at the bottom of the upper mold bottom plate. The upper mold bottom plate and the lower mold are combined to form an injection molding cavity; a runner insert is arranged at the bottom of the runner insert plate, an ejection mechanism is arranged in the runner insert, and the ejection mechanism comprises an insert pin and a spring; an annular pouring point piece is further embedded in the bottom of the runner embedding plate, a plurality of branch pouring point pipes are evenly distributed on the annular pouring point piece along the center of the annular pouring point piece, and the branch pouring point pipes penetrate through the upper mold bottom plate to communicate with the injection molding cavity; the insert pin is arranged in the runner insert in a sliding mode, the lower portion of the insert pin is connected with the annular pouring point piece, and the spring is arranged on the top of the insert. The method has the advantages that the annular pouring point piece is easy to take out in the production process, the metal insert is accurately installed, and the cylinder deforms in all directions are the same.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding equipment technology, and specifically relates to a shaft-type injection mold. Background Technology

[0002] With the continuous advancement and development of technology, people have increasingly higher requirements for the size, weight, and appearance of products. This has led to continuous optimization of product weight, lifespan, and aesthetics during the design process. To reduce weight, design engineers have replaced some less important metal components with plastic materials. Plastic materials not only reduce product weight, but their superior properties also provide abrasion and corrosion resistance. Furthermore, plastics possess high-temperature resistance and non-conductive properties, thus protecting human safety.

[0003] For a product structure where a plastic part encapsulates a metal insert through injection molding, the working principle involves first placing the metal insert in the mold and then injecting the plastic. The following technical problems still exist during the injection molding process:

[0004] 1. For cylindrical and shaft molds with a diameter of ∅70mm or more, in order to ensure smooth flow, reduce injection pressure, and maintain the coaxiality and cylindrical shape of the product, a runner structure with three or more gates is generally selected. However, the more gates there are, the more likely the runner will stick to the front mold, making it difficult to remove the runner.

[0005] 2. The metal insert of the product is too long. Normally, inserts exceeding 50mm will cause a problem during the injection molding process: if the metal insert is not installed in place, it will tilt under the action of gravity. During the mold closing process, the front mold forcibly presses the insert back to the installation position, which may damage the mold and cause burrs on the product, increasing the cost of mold repair and production.

[0006] Therefore, the above-mentioned problems have become technical issues that urgently need to be solved.

[0007] 3. Cylindrical products generally require very precise cylindrical shapes. However, the shrinkage and warping of plastic parts, as well as their susceptibility to uneven cooling temperature variations, result in inconsistent deformation in all directions. Ultimately, this leads to the product failing to meet the required cylindrical shape.

[0008] Therefore, the above problems urgently need to be solved. Utility Model Content

[0009] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides a shaft-type injection mold with a simple structure and reasonable design. The annular gating part is easy to remove during the production process. The positioning mechanism ensures that the metal insert is installed in place. The annular water channel makes the deformation of the cylinder the same in all directions.

[0010] Technical solution: In order to achieve the above objectives, this utility model provides a shaft-type injection mold, including an upper mold plate, a runner plate, an upper mold base plate and a lower mold. The runner plate is located at the bottom of the upper mold plate, the upper mold base plate is located at the bottom of the runner plate, and the lower mold is located at the bottom of the upper mold base plate. The upper mold base plate and the lower mold are combined to form an injection cavity.

[0011] The bottom of the flow channel panel is provided with a flow channel insert, and the flow channel insert is provided with an ejection mechanism, which includes an insert pin and a spring;

[0012] The bottom of the runner plate is also fitted with an annular gating element, and several gating tubes are evenly distributed along the center of the annular gating element. The gating tubes pass through the upper mold base plate and connect to the injection cavity.

[0013] The insert pin is slidably disposed within the runner insert and its lower part is connected to the annular sprue. The spring is disposed at the top of the insert pin. During the mold opening process, the insert pin, under the action of the spring force, pushes out the annular sprue, thereby ejecting the runner and removing it.

[0014] Furthermore, the bottom of the upper mold plate is provided with a pull plate, and the pull plate is provided with pull pins equal in number to the annular sprue. The annular sprue is provided with a quick-connect interface, and the bottom of the pull pin is provided with a quick-connect plug. The pull pin is connected to the annular sprue through the quick-connect plug and quick-connect interface. When the mold is closed, the pull pin quickly engages with the upper part of the annular sprue. In the initial stage of mold opening, the annular sprue separates from the product under the action of the pull pin. As the mold continues to open, the annular sprue separates from the pull pin. Finally, under the action of the ejection mechanism, the annular sprue separates from the runner insert.

[0015] Furthermore, the upper template is provided with a flow channel pipe, which passes through the upper template and the flow channel panel and communicates with the annular gating point component;

[0016] The upper mold plate has a top plate at its upper part, and a positioning ring is located at the center of the top plate. A flow channel is concentrically located inside the positioning ring, and the flow channel is connected to the flow channel pipe. The feeding device is quickly connected to the mold through the positioning ring. The injection material enters the annular gating part through the flow channel pipe, and finally enters the injection cavity through multiple branch gating pipes.

[0017] Furthermore, the lower mold includes a mold base plate and a lower mold frame, the lower mold frame being mounted on the mold base plate, and the mold base plate being provided with an ejection device;

[0018] The ejection device includes a movable plate, ejector pins, guide pillars, and a return spring. The movable plate is mounted on the mold base plate, the ejector pins are mounted on the movable plate, the lower part of the guide pillars is slidably inserted into the movable plate, and the upper part of the guide pillars is connected to the bottom of the lower mold frame. The return spring is sleeved on the guide pillars. When the movable plate moves upward, it causes the ejector pins to move upward, entering the injection cavity and ejecting the molded product to complete demolding. During the ejection process, the return spring is compressed. After ejection, the movable plate returns to its original position under the action of the return spring.

[0019] Furthermore, the ejector pin communicates with the injection cavity, and an ejector hole is provided on the mold base plate, which leads to the bottom of the movable plate. An external power unit acts on the movable plate through the ejector hole, thereby driving the movable plate to move.

[0020] Furthermore, the lower mold base is equipped with a positioning mechanism, which includes a mounting base and a laser sensor. The laser sensor is mounted on the mounting base, which is located inside the lower mold base. The mounting base has a through hole that communicates with the injection cavity, allowing the ejector pin to pass through the through hole and enter the injection cavity. The injection-molded product has a metal insert overmolded structure. During injection molding, the metal insert must first be placed in the mold before injection molding. When the robotic arm places the metal insert, the laser sensor detects whether the metal insert is properly installed. Once the metal insert is properly installed, the laser sensor sends a signal to the injection molding machine. Upon receiving the signal, the injection molding machine begins mold closing; otherwise, the machine will not operate, ensuring accurate placement of the metal insert and improving product quality.

[0021] Furthermore, the upper mold base plate is provided with a set of upper mold water channel inserts, which have annular water channels and are located at the upper part of the injection cavity; the lower mold frame is provided with a lower mold water channel insert, which also has annular water channels and is located at the lower part of the injection cavity, with the bottom of the upper mold water channel insert connected to the top of the lower mold water channel insert. The annular water channels on the upper and lower mold water channel inserts ensure that the water channels completely surround the product for cooling, while also ensuring that the distance from the water channels to the surface of the cylindrical product is consistent, thereby ensuring consistent deformation and warping in all directions.

[0022] As can be seen from the above technical solution, this utility model has the following beneficial effects:

[0023] 1. This utility model provides a shaft-type injection mold with an ejection mechanism on the annular gating part. When the mold is opened, the spring force is used to eject the annular gating part and separate it from the runner insert. This solves the problem that the material head of the product runner cannot be demolded during the mold opening process due to too many material pullers, and enables the product to be produced stably for a long time.

[0024] 2. This utility model provides an additional positioning mechanism that uses a laser sensor to detect whether the metal insert is installed in place, thereby avoiding damage to the mold surface during the mold closing process and the risk of burrs on the product, thus improving product quality.

[0025] 3. This utility model designs a cooling system, including an upper mold water channel insert and a lower mold water channel insert. Both are equipped with annular water channels, which can make the water channels completely surround the product for cooling. At the same time, it can ensure that the distance between the water channels and the surface of the cylindrical product is consistent, thereby making the deformation and warping consistent in all directions, which facilitates the subsequent adjustment of the injection molding process by injection molding engineers. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of a shaft-type injection mold according to the present invention;

[0027] Figure 2 This is a schematic diagram of the mold opening of a shaft-type injection mold according to the present invention (the annular gating part is separated from the product).

[0028] Figure 3 This is a schematic diagram of the mold opening of a shaft-type injection mold according to the present invention (the annular gating point is separated from the pull pin).

[0029] Figure 4 This is a schematic diagram of the mold opening of a shaft-type injection mold according to the present invention (the upper mold base plate is separated from the lower mold).

[0030] Figure 5 This is a schematic diagram showing the cooperation between the annular casting point component and the material pulling needle described in this utility model;

[0031] Figure 6 This is a schematic diagram showing the separation state of the annular casting point component and the material pulling needle according to this utility model;

[0032] Figure 7 This is a schematic diagram of the structure of the annular casting point component described in this utility model;

[0033] Figure 8 This is a schematic diagram of the positioning mechanism described in this utility model;

[0034] Figure 9 This is a schematic diagram of the installation of the positioning mechanism described in this utility model;

[0035] Figure 10 This is a schematic diagram of the upper mold water channel insert of this utility model;

[0036] Figure 11 This is a cross-sectional view of the upper mold water channel insert described in this utility model;

[0037] Figure 12This is a schematic diagram of the lower mold water channel insert structure described in this utility model;

[0038] Figure 13 This is a cross-sectional view of the lower mold water channel insert described in this utility model;

[0039] Figure 14 This is a schematic diagram of the water channel of a shaft-type injection mold according to the present invention.

[0040] In the diagram: 1-Upper template, 11-Pulling plate, 12-Pulling needle, 13-Flow channel tube, 14-Top plate, 141-Positioning ring, 142-Flow channel opening;

[0041] 2-Runner insert, 21-Annular gating element, 22-Support gating tube, 23-Runner insert, 24-Ejection mechanism, 241-Insertion pin, 242-Spring;

[0042] 3-Upper mold base plate, 31-Upper mold water channel insert, 44-Lower mold water channel insert;

[0043] 4-Lower mold, 41-Mold base plate, 411-Ejection hole, 42-Lower mold holder, 421-Mounting base, 422-Laser sensor, 43-Ejection device, 431-Moving plate, 432-Ejector pin, 433-Guide post, 434-Reset spring;

[0044] 5-Metal inserts. Detailed Implementation

[0045] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0046] Example 1:

[0047] like Figure 1 As shown, a shaft-type injection mold includes an upper mold plate 1, a runner plate 2, an upper mold base plate 3, and a lower mold 4. The runner plate 2 is located at the bottom of the upper mold plate 1, the upper mold base plate 3 is located at the bottom of the runner plate 2, and the lower mold 4 is located at the bottom of the upper mold base plate 3. The upper mold base plate 3 and the lower mold 4 are combined to form an injection cavity.

[0048] like Figure 5 , Figure 6 As shown, the bottom of the flow channel panel 2 is provided with a flow channel insert 23, and the flow channel insert 23 is provided with an ejection mechanism 24, which includes an insert pin 241 and a spring 242.

[0049] like Figure 7 As shown, the bottom of the runner plate 2 is also provided with an annular gating element 21. Several gating tubes 22 are evenly distributed along the center of the annular gating element 21. The gating tubes 22 pass through the upper mold base plate 3 and connect to the injection cavity.

[0050] The insert pin 241 is slidably disposed within the flow channel insert 23 and its lower part is connected to the annular pouring point 21, and the spring 242 is disposed on the top of the insert pin 241.

[0051] The bottom of the upper template 1 is provided with a pull plate 11, and the pull plate 11 is provided with a number of pull pins 12 equal to the number of annular casting parts 21. The annular casting parts 21 are provided with quick-connect interfaces, and the bottom of the pull pins 12 is provided with quick plugs. The pull pins 12 are connected to the annular casting parts 21 through quick plugs and quick-connect interfaces.

[0052] With the mold closed, the injection molding machine begins injection. At this time, the annular gating element 21 is connected to the pull pin 12, such as... Figure 5 As shown, after injection molding is completed, the injection molding machine is opened, and at this time the mold is initially opened as shown. Figure 2 As shown, the annular gating part 21 separates from the product under the action of the pull pin 12. The mold continues to open, and at this point, the second mold opening distance is as shown. Figure 3 As shown, the pull pin 12 and the annular gating part 21 are simultaneously subjected to a downward force pushed out by the spring 242. The annular gating part 21 detaches from the mold and automatically falls to begin moving. Figure 6 As shown. The mold then continues to move until the upper mold base plate 3 separates from the lower mold 4, as... Figure 4 As shown.

[0053] like Figure 2 As shown, the upper template 1 is provided with a flow channel pipe 13, which passes through the upper template 1 and the flow channel panel 2 and communicates with the annular casting point 21;

[0054] The upper template 1 is provided with a top plate 14, and a positioning ring 141 is provided at the center of the top plate 14. A flow channel 142 is provided concentrically inside the positioning ring 141, and the flow channel 142 is connected to the flow channel pipe 13.

[0055] like Figure 4 As shown, the lower mold 4 includes a mold base plate 41 and a lower mold frame 42. The lower mold frame 42 is disposed on the mold base plate 41, and the mold base plate 41 is provided with an ejection device 43.

[0056] The ejection device 43 includes a movable plate 431, an ejector pin 432, a guide post 433, and a return spring 434. The movable plate 431 is disposed on the mold base plate 41, the ejector pin 432 is disposed on the movable plate 431, the lower part of the guide post 433 is slidably inserted into the movable plate 431, the upper part of the guide post 433 is connected to the bottom of the lower mold frame 42, and the return spring 434 is sleeved on the guide post 433.

[0057] The ejector pin 432 communicates with the injection cavity, and the mold base plate 41 is provided with an ejector hole 411, which leads to the bottom of the moving plate 431.

[0058] An external power unit transmits power to the moving plate 431 through the ejection hole 411. The moving plate 431 is lifted by force, which drives the ejector pin 432 to rise and enter the injection cavity to eject the product. During the ejection process, the return spring 434 is compressed. After the ejection is completed, the moving plate 431 moves back to its original position under the action of the return spring 434.

[0059] Example 2:

[0060] Based on Example 1, such as Figure 8-9 In this embodiment, a positioning mechanism is provided in the lower mold frame 42. The positioning mechanism includes a mounting base 421 and a laser sensor 422. The laser sensor 422 is mounted on the mounting base 421. The mounting base 421 is located in the lower mold frame 42. The mounting base 421 is provided with a through hole, which communicates with the injection cavity. The ejector pin 432 can pass through the through hole and enter the injection cavity.

[0061] Before injection molding, a robotic arm places the metal insert 5. When the robotic arm places the metal insert 5, a laser sensor 422 detects whether the insert 5 is properly installed. Once the insert 5 is in place, the laser sensor 422 sends a signal to the injection molding machine. Upon receiving the signal, the injection molding machine begins mold closing; otherwise, it will not operate. This ensures accurate placement of the metal insert, preventing damage to the mold surface during mold closing and avoiding the risk of burrs on the product.

[0062] Example 3:

[0063] Based on Examples 1 and 2, such as Figure 10-14 As shown, in this embodiment, the upper mold base plate 3 is provided with a set of upper mold water channel inserts 31, the upper mold water channel inserts 31 are provided with annular water channels, and the upper mold water channel inserts 31 are located in the upper part of the injection cavity; the lower mold frame 42 is provided with a lower mold water channel insert 44, the lower mold water channel insert 44 is provided with annular water channels, the lower mold water channel insert 44 is located in the lower part of the injection cavity, and the bottom of the upper mold water channel insert 31 is connected to the top of the lower mold water channel insert 44.

[0064] Annular water channels are provided on the upper mold water channel insert 31 and the lower mold water channel insert 44. The upper mold water channel insert 31 mainly cools the upper part of the product evenly, while the lower mold water channel insert 44 wraps the metal insert 5 to cool the lower part of the product. This ensures that the water channels completely surround the product for cooling, and at the same time, it ensures that the distance between the water channels and the surface of the cylindrical product is consistent, thereby making the deformation and warping consistent in all directions.

[0065] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.

Claims

1. A shaft-type injection mold, characterized in that, It includes an upper mold plate (1), a runner plate (2), an upper mold base plate (3), and a lower mold (4). The runner plate (2) is located at the bottom of the upper mold plate (1), the upper mold base plate (3) is located at the bottom of the runner plate (2), and the lower mold (4) is located at the bottom of the upper mold base plate (3). The upper mold base plate (3) and the lower mold (4) are combined to form an injection molding cavity. The bottom of the flow channel panel (2) is provided with a flow channel insert (23), and the flow channel insert (23) is provided with an ejection mechanism (24), which includes an insert pin (241) and a spring (242). The bottom of the flow channel plate (2) is also provided with an annular gating element (21), and several gating pipes (22) are evenly distributed along the center of the annular gating element (21). The gating pipes (22) pass through the upper mold base plate (3) and connect to the injection cavity. The insert (241) is slidably disposed within the flow channel insert (23) and its lower part is connected to the annular gating point (21), and the spring (242) is disposed on the top of the insert (241).

2. The shaft-type injection mold according to claim 1, characterized in that, The bottom of the upper template (1) is provided with a pull plate (11), the pull plate (11) is provided with a number of pull pins (12) equal to the number of annular gating parts (21), the annular gating parts (21) is provided with a quick-connect interface, the bottom of the pull pins (12) is provided with a quick plug, and the pull pins (12) are connected to the annular gating parts (21) through the quick plug and quick-connect interface.

3. A shaft-type injection mold according to claim 2, characterized in that, The upper template (1) is provided with a flow channel pipe (13), which passes through the upper template (1) and the flow channel panel (2) and communicates with the annular casting point component (21); The upper template (1) is provided with a top plate (14) at the top. A positioning ring (141) is provided at the center of the top plate (14). A flow channel (142) is provided concentrically inside the positioning ring (141). The flow channel (142) is connected to the flow channel pipe (13).

4. A shaft-type injection mold according to claim 1, characterized in that, The lower mold (4) includes a mold base plate (41) and a lower mold frame (42). The lower mold frame (42) is located on the mold base plate (41), and the mold base plate (41) is provided with an ejector device (43). The ejection device (43) includes a movable plate (431), an ejector pin (432), a guide post (433), and a return spring (434). The movable plate (431) is mounted on the mold base plate (41), the ejector pin (432) is mounted on the movable plate (431), the lower part of the guide post (433) is slidably inserted into the movable plate (431), the upper part of the guide post (433) is connected to the bottom of the lower mold frame (42), and the return spring (434) is sleeved on the guide post (433).

5. A shaft-type injection mold according to claim 4, characterized in that, The ejector pin (432) communicates with the injection cavity, and the mold base plate (41) is provided with an ejector hole (411), which leads to the bottom of the moving plate (431).

6. A shaft-type injection mold according to claim 5, characterized in that, The lower mold frame (42) is provided with a positioning mechanism, which includes a mounting base (421) and a laser sensor (422). The laser sensor (422) is mounted on the mounting base (421), which is located inside the lower mold frame (42). The mounting base (421) is provided with a through hole, which communicates with the injection cavity. The ejector pin (432) can pass through the through hole and enter the injection cavity.

7. A shaft-type injection mold according to claim 6, characterized in that, The upper mold base plate (3) is provided with a set of upper mold water channel inserts (31), the upper mold water channel inserts (31) are provided with annular water channels, and the upper mold water channel inserts (31) are located at the upper part of the injection cavity; the lower mold frame (42) is provided with a lower mold water channel insert (44), the lower mold water channel inserts (44) are provided with annular water channels, the lower mold water channel inserts (44) are located at the lower part of the injection cavity, and the bottom of the upper mold water channel inserts (31) is connected to the top of the lower mold water channel inserts (44).

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