Gear injection molding device and method

Abstract

The application discloses a gear injection molding device and method, which comprises a base, a guide plate and an upper die plate. The surface of the base is provided with a sealing structure. The sealing structure comprises a connecting groove, a fence, a connecting plate, a fixing groove, a clamping groove one, a clamping groove two and a positioning pin. The fence is wrapped around the bottom of the upper die plate. The connecting plate is connected with the two sides of the upper die plate. The connecting groove is arranged on the surface of the base. The fixing groove is arranged on the surface of the base. When the bottom of the fence is in contact with the bottom of the connecting groove, the bottom of the fixing groove is in contact with the bottom of the connecting plate. The clamping groove one is arranged on the bottom of the connecting groove. The clamping groove two is arranged in the connecting plate. The positioning pin passes through the clamping groove two and the clamping groove one in sequence. The bottom of the fence is provided with a liquid sealing structure. The movement track of the upper die plate is determined by the guide plate. The mold is calibrated by the connecting groove and the fixing groove. The mold is closed by the positioning pin. The staggered mold is closed by the fence.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to a misaligned mold opening and closing device and injection molding method for gear injection molding. Background Technology

[0002] In the production process of gears, due to the large demand for the product, injection molding is usually used.

[0003] Injection molding, also known as injection molding, is a molding method that combines injection and molding. The advantages of injection molding include high production speed and efficiency, automated operation, a wide variety of colors and shapes (from simple to complex), and sizes ranging from large to small. It also produces dimensionally accurate products, facilitates product updates, and can create complex shapes. Injection molding is suitable for mass production and molding of complex-shaped products. It involves injecting fully molten plastic material, stirred by a screw at a specific temperature, into a mold cavity under high pressure, and then cooling and solidifying to obtain the molded product. This method is suitable for the mass production of complex-shaped parts and is one of the important processing methods.

[0004] Application number CN202210779360.0 discloses a deformation-resistant PEEK gear injection mold. This invention provides a deformation-resistant PEEK gear injection mold, including a front mold plate and a rear mold plate that closes with the front mold plate. A hot runner nozzle is installed at the center of the front mold plate, and a cavity insert is installed on the rear mold plate at a position corresponding to the hot runner nozzle. In the mold-closed state, the hot runner nozzle and the cavity insert are interconnected, forming a mold cavity, and the PEEK gear injection molded part is located inside the mold cavity. It also includes a heating device, which is embedded in the cavity insert at the end away from the hot runner nozzle and close to the PEEK gear injection molded part.

[0005] However, the disclosed patent has issues such as the need for alignment during mold closing, which leads to long mold closing times and reduced production efficiency. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a misaligned mold opening and closing device and an injection molding method for gear injection molding.

[0007] To achieve the above objectives, the technical objective of this invention is achieved through the following technical solution: a misaligned mold opening and closing device for gear injection molding, comprising a base, a guide plate, and an upper mold plate. The base surface is provided with a sealing structure, which includes a connecting groove, a fence, a connecting plate, a fixing groove, a first snap-fit ​​groove, a second snap-fit ​​groove, and a positioning pin. The fence surrounds the bottom of the upper mold plate. The connecting plate is connected to both sides of the upper mold plate. The connecting groove is opened on the base surface. The fixing groove is opened on the base surface. When the bottom of the fence contacts the bottom of the connecting groove, the bottom of the fixing groove contacts the bottom of the connecting plate. The first snap-fit ​​groove is opened on the top of the connecting plate. The second snap-fit ​​groove is opened inside the fixing groove. The positioning pin passes through the second snap-fit ​​groove and the first snap-fit ​​groove in sequence. The bottom of the fence is provided with a liquid seal structure.

[0008] Preferably, the liquid seal structure includes an oil storage chamber, a spring, a sealing plate, an oil outlet, and an elastic layer. The oil storage chamber is located at the bottom of the enclosure, the oil outlet is opened at the bottom of the oil storage chamber, the sealing plate is located inside the oil outlet and connected to the oil storage chamber through the spring, and the elastic layer is wrapped around the outside of the sealing plate.

[0009] Preferably, an oil seal protrusion is fixedly connected to the bottom of the connecting groove. The oil seal protrusion is conical in shape. When the bottom of the fence contacts the bottom of the connecting groove, the oil seal protrusion lifts up the sealing plate.

[0010] Preferably, the upper part of the fence is provided with a reflux structure, which includes a reflux pump, a conduit and a reflux pipe. The reflux pump is connected to the conduit and the reflux pipe respectively. One end of the conduit is located in the oil storage chamber and one end of the reflux pipe is located at the bottom of the connecting groove.

[0011] Preferably, the guide plate is U-shaped, with grooves on both sides of its inner side. The bottom of the guide plate is fixedly connected to the surface of the base. An electric cylinder is provided on the top of the guide plate, and the top of the upper template is driven by the electric cylinder. Movable plates are fixedly connected to both sides of the upper template, and the movable plates slide in the grooves. The bottom of the movable plates is connected to the bottom of the grooves by a spring.

[0012] Preferably, the upper template has an upper mold groove, a feeding pipe and a pressurizing air pipe, the feeding pipe is connected to the upper mold groove and the surface of the upper template, and the pressurizing air pipe is connected to the upper mold groove and the surface of the upper template.

[0013] Preferably, the base surface has a lower mold groove, and the lower mold groove and the upper mold groove are sealed to form a mold.

[0014] An injection molding method for a misaligned mold opening and closing device for gear injection molding includes: Mold closing: The electric cylinder drives the upper mold plate to move downwards, causing the guardrail to enter the connecting groove. The oil seal protrusion at the bottom of the connecting groove lifts the sealing plate, and oil flows out of the oil storage chamber to complete the oil seal. At the same time, the connecting plate enters the fixing groove and is fixed by the positioning pin. Filling: Raw materials are filled into the upper and lower mold slots through the feed pipe; Pressure holding: Pressure is increased and maintained through the pressurization and inflation tube; Cooling: After pressure holding is completed, injection molding begins. After molding is completed, cooling oil is added to the connecting groove to cool the entire device. Mold opening: After cooling is complete, remove the positioning pin, the electric cylinder drives the upper mold plate to move upward, the spring returns, and the mold opening is completed.

[0015] This invention provides a staggered mold opening and closing device and an injection molding method for gear injection molding. It has the following beneficial effects: 1. The upper template movement trajectory is determined by the guide plate, the mold closing is calibrated by the connecting groove and the fixing groove, the mold closing is performed by the positioning pin, and the mold closing is performed by the fence.

[0016] 2. The mold is liquid-sealed during mold closing using a liquid-sealing structure. Attached Figure Description

[0017] Figure 1 A perspective view of one embodiment of the invention; Figure 2 This is a side sectional view of the upper template; Figure 3 for Figure 2 Enlarged view of area A in the middle; Figure 4 This is a schematic diagram of the connection of the reflux structure; Figure 5 This is a flowchart of the injection molding process.

[0018] Reference numerals: 1. Base; 2. Guide plate; 3. Upper template; 4. Sealing structure; 5. Connecting groove; 6. Fence; 7. Connecting plate; 8. Fixing groove; 9. Snap-fit ​​groove one; 10. Snap-fit ​​groove two; 11. Positioning pin; 12. Liquid seal structure; 13. Oil storage chamber; 14. Spring one; 15. Sealing plate; 16. Oil outlet; 17. Elastic layer; 18. Oil seal protrusion; 19. Return structure; 20. Return pump; 21. Conduit; 22. Return pipe; 23. Slide groove; 24. Electric cylinder; 25. Moving plate; 26. Spring two; 27. Upper mold groove; 28. Feed pipe; 29. ​​Pressurization and inflation pipe; 30. Lower mold groove. Detailed Implementation

[0019] The following description is merely a preferred embodiment of the present invention, and the scope of protection is not limited to this embodiment. All technical solutions falling within the scope of the present invention should be considered within the protection scope of the present invention. It should also be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the protection scope of the present invention.

[0020] As shown in the figure, an injection molding method for a gear injection molding device with a staggered mold opening and closing mechanism includes: (1) Mold closing: The electric cylinder 24 drives the upper mold plate 3 to move downward, which in turn drives the railing 6 into the connecting groove 5. The oil seal protrusion 18 at the bottom of the connecting groove 5 lifts the sealing plate 15, and the oil in the oil storage chamber 13 flows out to complete the oil seal. At the same time, the connecting plate 7 enters the fixing groove 8 and is fixed by the positioning pin 11; (2) Filling: The raw material is filled into the upper mold groove 27 and the lower mold groove 30 through the feed pipe 28; (3) Pressure holding: Pressure is increased and maintained through the pressurization and inflation pipe 29; (4) Cooling: After the pressure holding is completed, injection molding begins. After molding is completed, cooling oil is added to the connecting groove 5 to cool the entire device. (5) Mold opening: After cooling is completed, remove the positioning pin 11, the electric cylinder 24 drives the upper template 3 to move upward, the spring 26 returns, and the mold opening is completed.

[0021] A staggered mold opening and closing device for gear injection molding includes a base 1, a guide plate 2, and an upper template 3.

[0022] The base 1 has a sealing structure 4 on its surface. The sealing structure 4 includes a connecting groove 5, a fence 6, a connecting plate 7, a fixing groove 8, a first snap-fit ​​groove 9, a second snap-fit ​​groove 10, and a positioning pin 11. The fence 6 wraps around the bottom of the upper template 3. The connecting plate 7 is connected to both sides of the upper template 3. The connecting groove 5 and the fixing groove 8 are both located on the surface of the base 1. When the bottom of the fence 6 contacts the bottom of the connecting groove 5, the bottom of the fixing groove 8 contacts the bottom of the connecting plate 7. The first snap-fit ​​groove 9 is located on the top of the connecting plate 7. The second snap-fit ​​groove 10 is located inside the fixing groove 8. The positioning pin 11 passes through the second snap-fit ​​groove 10 and the first snap-fit ​​groove 9 in sequence. When the mold is closed, the fence 6 enters the connecting groove 5, the connecting plate 7 enters the fixing groove 8, and the upper template 3 is fixed by the positioning pin 11 passing through the first snap-fit ​​groove 9 and the second snap-fit ​​groove 10.

[0023] The bottom of the enclosure 6 is provided with a liquid seal structure 12, which includes an oil storage chamber 13, a spring 14, a sealing plate 15, an oil outlet 16, and an elastic layer 17. The oil storage chamber 13 is located at the bottom of the enclosure 6, the oil outlet 16 is opened at the bottom of the oil storage chamber 13, the sealing plate 15 is located inside the oil outlet 16 and is connected to the oil storage chamber 13 through the spring 14, and the elastic layer 17 wraps around the outside of the sealing plate 15. An oil seal protrusion 18 is fixedly connected to the bottom of the connecting groove 5. The oil seal protrusion 18 is conical. When the bottom of the enclosure 6 contacts the bottom of the connecting groove 5, the oil seal protrusion 18 pushes up the sealing plate 15, the spring 14 contracts, and the oil in the oil storage chamber 13 enters the connecting groove 5 from the oil outlet 16 to perform oil sealing.

[0024] The upper part of the enclosure 6 is equipped with a return structure 19, which includes a return pump 20, a conduit 21, and a return pipe 22. The return pump 20 is connected to the conduit 21 and the return pipe 22. One end of the conduit 21 is located in the oil storage chamber 13, and one end of the return pipe 22 is located at the bottom of the connecting groove 5. After injection molding is completed, the return pump 20 recovers the oil in the connecting groove 5 through the return pipe 22, and the oil returns to the oil storage chamber 13 through the conduit 21.

[0025] The guide plate 2 is U-shaped, with grooves 23 on both sides of its inner side. The bottom of the guide plate 2 is fixedly connected to the surface of the base 1. An electric cylinder 24 is installed on the top of the guide plate 2, driving the top of the upper template 3. Movable plates 25 are fixedly connected to both sides of the upper template 3, sliding within the grooves 23. The bottom of the movable plates 25 is connected to the bottom of the grooves 23 via springs 26. The electric cylinder 24 drives the upper template 3 to move up and down, causing the movable plates 25 to slide within the grooves 23. Simultaneously, springs 26 retract to facilitate mold opening.

[0026] The upper mold plate 3 has an upper mold groove 27, a feed pipe 28, and a pressurizing air pipe 29. The feed pipe 28 connects the upper mold groove 27 and the surface of the upper mold plate 3, and the pressurizing air pipe 29 also connects the upper mold groove 27 and the surface of the upper mold plate 3. The base 1 has a lower mold groove 30 on its surface. The lower mold groove 30 and the upper mold groove 27 are sealed together to form a mold. The feed pipe 28 is used for feeding material, and the pressurizing air pipe 29 is used for maintaining pressure. Injection molding is performed between the upper mold groove 27 and the lower mold groove 30.

[0027] Working principle: The electric cylinder 24 drives the upper template 3 to move up and down, so that the moving plate 25 slides in the slide groove 23, while the spring 26 retracts to facilitate mold opening.

[0028] In summary, the movement trajectory of the upper template 3 is determined by the guide plate 2, the mold closing is calibrated by the connecting groove 5 and the fixing groove 8, the mold closing is performed by the positioning pin 11, the staggered mold closing is performed by the fence 6, and the mold is liquid sealed by the liquid sealing structure 12 at the same time as the mold closing.

Claims

1. A staggered mold opening and closing device for gear injection molding, comprising a base (1), a guide plate (2), and an upper mold plate (3), characterized in that, The base (1) has a sealing structure (4) on its surface. The sealing structure (4) includes a connecting groove (5), a fence (6), a connecting plate (7), a fixing groove (8), a snap-fit ​​groove one (9), a snap-fit ​​groove two (10), and a positioning pin (11). The fence (6) wraps around the bottom of the upper template (3). The connecting plate (7) is connected to both sides of the upper template (3). The connecting groove (5) is opened on the surface of the base (1). The fixing groove (8) is opened on the surface of the base (1). When the bottom of the fence (6) contacts the bottom of the connecting groove (5), the bottom of the fixing groove (8) contacts the bottom of the connecting plate (7). The snap-fit ​​groove one (9) is opened on the top of the connecting plate (7). The snap-fit ​​groove two (10) is opened in the fixing groove (8). The positioning pin (11) passes through the snap-fit ​​groove two (10) and the snap-fit ​​groove one (9) in sequence. The bottom of the fence (6) has a liquid seal structure (12). The upper part of the fence (6) is provided with a return structure (19), which includes a return pump (20), a conduit (21) and a return pipe (22). The return pump (20) is connected to the conduit (21) and the return pipe (22) respectively. One end of the conduit (21) is located in the oil storage chamber (13), and one end of the return pipe (22) is located at the bottom of the connecting groove (5). The guide plate (2) is U-shaped, and the inner sides of the guide plate (2) are provided with sliding grooves (23). The bottom of the guide plate (2) is fixedly connected to the surface of the base (1). The top of the guide plate (2) is provided with an electric cylinder (24). The top of the upper template (3) is driven by the electric cylinder (24). The upper template (3) is fixedly connected to the two sides of the moving plate (25). The moving plate (25) slides in the sliding groove (23). The bottom of the moving plate (25) is connected to the bottom of the sliding groove (23) by a spring (26). The upper template (3) is provided with an upper mold groove (27), a feed pipe (28) and a pressurizing air pipe (29). The feed pipe (28) connects the upper mold groove (27) and the surface of the upper template (3), and the pressurizing air pipe (29) connects the upper mold groove (27) and the surface of the upper template (3).

2. The gear injection molding offset mold opening and closing device according to claim 1, characterized in that, The liquid seal structure (12) includes an oil storage chamber (13), a spring (14), a sealing plate (15), an oil outlet (16), and an elastic layer (17). The oil storage chamber (13) is located at the bottom of the enclosure (6). The oil outlet (16) is opened at the bottom of the oil storage chamber (13). The sealing plate (15) is located inside the oil outlet (16) and is connected to the oil storage chamber (13) through the spring (14). The elastic layer (17) is wrapped around the outside of the sealing plate (15).

3. The gear injection molding offset mold opening and closing device according to claim 2, characterized in that, An oil seal protrusion (18) is fixedly connected to the bottom of the connecting groove (5). The oil seal protrusion (18) is conical. When the bottom of the fence (6) contacts the bottom of the connecting groove (5), the oil seal protrusion (18) pushes up the sealing plate (15).

4. The gear injection molding offset mold opening and closing device according to claim 3, characterized in that, The base (1) has a lower mold groove (30) on its surface. The lower mold groove (30) and the upper mold groove (27) are sealed together to form a mold.

5. The injection molding method for a gear injection molding misalignment mold opening and closing device according to claim 4, comprising: (1) Mold closing: The electric cylinder (24) drives the upper template (3) to move downward, and the fence (6) enters the connecting groove (5). The oil seal protrusion (18) at the bottom of the connecting groove (5) lifts the sealing plate (15), and the oil in the oil storage chamber (13) flows out to complete the oil seal. At the same time, the connecting plate (7) enters the fixing groove (8) and is fixed by the positioning pin (11). (2) Filling: Fill the upper mold groove (27) and lower mold groove (30) with raw material through the feed pipe (28); (3) Pressure holding: Pressure is increased and maintained through the pressurization tube (29); (4) Cooling: After pressure holding is completed, injection molding begins. After molding is completed, cooling oil is added to the connecting groove (5) to cool the entire device. (5) Mold opening: After cooling is completed, remove the positioning pin (11), the electric cylinder (24) drives the upper template (3) to move upward, and the spring (26) returns to complete the mold opening.

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