Electroplated sheet injection molding process and equipment thereof

Abstract

The invention discloses an electroplating sheet injection molding process and equipment thereof, and relates to the technical field of injection molding, and the electroplating sheet injection molding process comprises the following operation steps: S1, suction: after mold closing, sucking the interior of a mold into a vacuum state; s2, injection molding is conducted, specifically, plastic fluid is rotationally injected into the mold, the injection angle and the flow speed are adjusted, and the plastic fluid is evenly distributed in the mold; and S3, demolding is conducted, specifically, after molding, the vacuum state is relieved, demolding is completed, an operation table is further included, a conveying pipeline used for rotationally conveying plastic fluid is arranged above the operation table, the conveying pipeline comprises a second pipe section, an inner cavity is formed in the wall body of the second pipe section, and the inner cavity is inflated and expanded. According to the electroplating sheet injection molding process and equipment thereof, the plastic fluid is injected in a rotating mode, and the injection angle and the flow speed are adjusted, so that the plastic fluid is uniformly distributed in the mold, the material uniformity of the sheet is improved, and the subsequent electroplating effect is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, and in particular to an electroplating sheet injection molding process and equipment thereof. Background Art

[0002] Compared with metal parts, plastic electroplating products can not only achieve a good metal texture, but also reduce the weight of the products. While effectively improving the appearance and decorativeness of plastics, it also improves its electrical, thermal and corrosion resistance properties.

[0003] In the prior art, electroplated sheet injection molding is usually performed through a channel set at the upper mold. The injection area of ​​the channel is limited, and it is difficult to quickly and evenly inject the heated and molten plastic fluid into the mold cavity. The efficiency needs to be improved.

[0004] Therefore, it is necessary to propose an electroplating sheet injection molding process and equipment to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a electroplated sheet injection molding process and equipment thereof to solve the problem that the electroplated sheet injection molding in the prior art is usually performed by injection molding through a channel arranged at the upper mold, the injection area of ​​the channel is limited, and it is difficult to quickly and evenly inject the heated and molten plastic fluid into the mold cavity, and the utilization efficiency needs to be improved.

[0006] To achieve the above object, the present invention provides the following technical solution: an electroplating sheet injection molding process, comprising the following steps: S1. Suction: After the mold is closed, the inside of the mold is sucked into a vacuum state; S2, Injection: Rotate and inject plastic fluid into the mold, and adjust the injection angle and flow rate, so that the plastic fluid is evenly distributed inside the mold; S3, demoulding: After molding, release the vacuum state and complete demoulding.

[0007] The present invention also discloses an electroplated sheet injection molding device, which is applied to the above-mentioned electroplated sheet injection molding process, and also includes an operating table, above which is arranged a conveying pipeline for rotatably conveying plastic fluid, the conveying pipeline includes a second pipe section, and the wall of the second pipe section is internally provided with an inner cavity, when the inner cavity is inflated, the outlet of the second pipe section is tilted to adjust the injection angle of the plastic fluid, and at the same time the inner wall of the second pipe section is contracted, the flow rate of the plastic fluid is accelerated, and the injection distance becomes longer.

[0008] Preferably, at least one inner cavity is provided.

[0009] Preferably, the inner cavity is arranged on one side of the wall of the second pipe section.

[0010] Preferably, the thickness of the inner wall of the inner cavity gradually decreases from the middle of the inner cavity to the upper and lower sides.

[0011] Preferably, the thickness of the inner wall of the inner cavity gradually increases from the middle of the inner cavity to the upper and lower sides.

[0012] Preferably, the conveying pipeline further includes a first pipe section and a third pipe section, wherein the first pipe section is connected to the top end of the second pipe section and the first pipe section is connected to the factory plastic fluid pipeline, and the third pipe section is connected to the bottom end of the second pipe section.

[0013] Preferably, an upper mold is arranged above the operating table, a circular groove is opened on the upper mold, and the circular groove runs through the upper and lower surfaces of the upper mold, and a conveying pipe is arranged in the circular groove. A lower mold is fixedly connected to the top of the operating table, and the lower mold is located below the upper mold. A molding cavity is arranged on the top of the lower mold.

[0014] Preferably, a first gas delivery channel is opened inside the wall of the first pipe section, and the bottom end of the first gas delivery channel is connected to the inner cavity. A ring sleeve is arranged above the upper mold, and the ring sleeve is fixedly connected to the first pipe section. The top end of the ring sleeve is rotatably connected to a cover plate, and the cover plate is rotatably connected to the first pipe section. A first air cavity is formed between the cover plate and the ring sleeve, and the top end of the first gas delivery channel is connected to the first air cavity. A pump body is fixedly connected to the inside of the operating table, and the first air cavity is connected and cooperated with the pump body. A driving component for driving the ring sleeve to rotate is arranged below the support plate.

[0015] Preferably, a rotating plate is fixedly connected to the top of the circular groove, and a through groove is provided on the rotating plate for the first pipe section to pass through, the first pipe section is rotatably connected to the rotating plate, a first electric push rod is fixedly connected to the top of the upper mold, a support plate is fixedly connected to the telescopic end of the first electric push rod, the support plate is rotatably connected to the first pipe section, a connecting rod is fixedly connected to the lower surface of the support plate, and the bottom end of the connecting rod is fixedly connected to the cover plate.

[0016] Technical effects and advantages of the present invention: 1. The present invention adopts a rotating method to inject the plastic fluid, and adjusts the injection angle and flow rate, so that the plastic fluid is evenly distributed inside the mold, improving the material uniformity of the sheet and ensuring the effect of subsequent electroplating; 2. By setting the second pipe section, inner cavity and other structures, the injection angle of the plastic fluid can be controlled, and at the same time, it has the effect of accelerating the plastic fluid, thereby improving the efficiency of injection molding; 3. When the inner cavity gradually becomes larger, the spraying direction gradually changes from the middle of the molding cavity to the edge of the molding cavity, and the injection angle of the plastic fluid is adjusted to further expand the injection range, so that the plastic fluid can be quickly and evenly injected into the molding cavity, the injection speed and molding quality are improved, and the material of the sheet after molding is more uniform; 4. The first electric push rod and the support plate drive the first pipe section to move up and down to adjust the injection height position; 5. In the process of gradually transitioning from spraying to the middle of the molding cavity to spraying to the edge of the molding cavity, the flow rate of the plastic fluid gradually increases and the spraying distance becomes longer, ensuring that it can spray to the edge of the molding cavity, further improving the uniformity of injection molding; 6. When the inner wall thickness of the inner cavity gradually increases from the middle of the inner cavity to the upper and lower sides, the instantaneous flow rate of the plastic fluid can be controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a process flow chart of the electroplated sheet injection molding process of the present invention.

[0018] Figure 2 This is a structural schematic diagram of the electroplated sheet injection molding equipment from one perspective of the present invention.

[0019] Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure in the middle.

[0020] Figure 4 This is a schematic structural diagram of the electroplated sheet injection molding equipment from another perspective of the present invention.

[0021] Figure 5 It is a schematic diagram of the upper mold and conveying pipeline structure of the present invention.

[0022] Figure 6 It is a schematic diagram of the lower mold and upper mold structure of the present invention.

[0023] Figure 7 For the present invention Figure 5 Enlarged schematic diagram of the structure at point B in the middle.

[0024] Figure 8 For the present invention Figure 5 Enlarged schematic diagram of the structure at point C in the middle.

[0025] Fig. 9 For the present invention Figure 5 Enlarged schematic diagram of the structure at point D in the middle.

[0026] Fig.10 This is a schematic diagram of Example 1 of the inner cavity structure of the present invention.

[0027] Fig.11 This is a schematic diagram of Example 2 of the inner cavity structure of the present invention.

[0028] In the figure: 1. operating table; 2. lower mold; 3. molding cavity; 4. upper mold; 5. circular groove; 6. conveying pipeline; 7. first pipe section; 8. second pipe section; 9. third pipe section; 10. first gas conveying channel; 11. inner cavity; 12. slide plate; 13. rotating plate; 14. second gas conveying channel; 15. recovery groove; 16. first air bag; 17. ring sleeve; 18. cover plate; 19. first air cavity; 20. support plate; 21. connecting rod; 22. first electric push rod; 23. motor; 24. gear; 25. gear ring; 26. pump body; 27. second air bag; 28. square groove; 29. ​​top block; 30. second electric push rod; 31. second air cavity; 32. third electric push rod; 33. bracket; 34. frame groove. DETAILED DESCRIPTION

[0029] The present invention provides Figure 1 The electroplated sheet injection molding process shown includes the following steps: S1. Suction: After the mold is closed, the inside of the mold is sucked into a vacuum state; S2, Injection: Rotate and inject plastic fluid into the mold, and adjust the injection angle and flow rate, so that the plastic fluid is evenly distributed inside the mold; S3, demoulding: After molding, release the vacuum state and complete demoulding.

[0030] The present invention adopts a rotating manner to inject plastic fluid, and adjusts the injection angle and flow rate, so that the plastic fluid is evenly distributed inside the mold, thereby improving the material uniformity of the sheet and ensuring the effect of subsequent electroplating.

[0031] Embodiment 1, the present invention provides as Figure 2 to Figure 10 The electroplated sheet injection molding device shown is applied to the electroplated sheet injection molding process described above, and further includes an operating table 1, an upper mold 4 is arranged above the operating table 1, a bracket 33 is fixedly connected to the top of the operating table 1, a third electric push rod 32 is fixedly connected to the upper surface of the top of the bracket 33, a through slot is provided on the top of the bracket 33 for the telescopic end of the third electric push rod 32 to pass through, and the upper mold 4 is fixedly connected to the telescopic end of the third electric push rod 32. The upper mold 4 is driven to move up and down by the third electric push rod 32.

[0032] A lower mold 2 is fixedly connected to the top of the operating table 1 . The lower mold 2 is located below the upper mold 4 . A molding cavity 3 is provided on the top of the lower mold 2 .

[0033] Considering that in the existing injection molding, an injection hole is usually set at the upper mold 4, and then injection is performed into the interior of the molding cavity 3 through the injection hole, but the injection area of ​​the injection hole is limited, and it is difficult to quickly and evenly inject the heated and molten plastic fluid into the cavity, which is easy to affect the material uniformity of the sheet after molding, and then affect the effect of subsequent electroplating. In order to achieve uniform injection molding, a conveying pipe 6 for rotatably conveying the plastic fluid is arranged above the operating table 1, a circular groove 5 is opened on the upper mold 4, and the circular groove 5 runs through the upper and lower surfaces of the upper mold 4, the conveying pipe 6 is arranged in the circular groove 5, and the conveying pipe 6 includes a second pipe section 8, the second pipe section 8 uses a soft material, such as rubber, etc., and an inner cavity 11 is arranged inside the wall of the second pipe section 8.

[0034] The inner cavity 11 can be made by adhesion, integral molding, etc., and can be adjusted according to specific usage conditions.

[0035] At least one inner cavity 11 is provided. When the second tube section 8 is thicker or made of harder material, multiple inner cavities 11 may be provided to ensure the inflation effect.

[0036] The inner cavity 11 is arranged on one side of the wall of the second pipe section 8 to ensure that the second pipe section 8 can achieve a bending effect.

[0037] The thickness of the inner wall of the inner cavity 11 gradually decreases from the middle of the inner cavity 11 to the upper and lower sides (refer to Fig.10 ).

[0038] Specifically, when the inner cavity 11 is inflated, the inner cavity 11 expands. Since the inner wall in the middle of the inner cavity 11 is thicker, the overall deformation of the inner cavity 11 presents: the degree of deformation caused by pulling up and down is greater than the degree of deformation caused by pulling left and right. However, there is no inner cavity 11 structure inside the inner wall on the other side of the second pipe segment 8. When the length of the second pipe segment 8 close to the inner cavity 11 is greater than the length of the other side of the second pipe segment 8, the second pipe segment 8 will bend and deform in the direction away from the inner cavity 11, which complies with the rule that the length of the outer corner of the bent pipe is greater than the length of the inner corner. At this time, the injection angle of the plastic fluid can be controlled.

[0039] Furthermore, since the degree of deformation caused by pulling up and down is greater than that caused by pulling left and right, the internal cross-sectional area of ​​the second pipe section 8 will decrease to a certain extent, but will not become too small, thereby ensuring the effect of accelerating the plastic fluid and not completely cutting off the liquid, thereby increasing the injection distance.

[0040] By providing the second pipe section 8, the inner cavity 11 and other structures, the injection angle of the plastic fluid can be controlled, and at the same time, the plastic fluid can be accelerated, thereby improving the efficiency of injection molding.

[0041] The delivery pipeline 6 also includes a first pipe section 7 and a third pipe section 9. The first pipe section 7 is connected to the top end of the second pipe section 8 and is connected to the factory plastic fluid pipeline. The third pipe section 9 is connected to the bottom end of the second pipe section 8.

[0042] The first pipe section 7 and the third pipe section 9 are both made of hard materials, such as stainless steel, to ensure that the two ends of the second pipe section 8 will not be deformed randomly, thereby achieving a better bending deformation effect.

[0043] Reference Fig. 9 When the inner cavity 11 located on the left side is inflated, the left part of the second tube segment 8 stretches, while the right part of the second tube segment 8 cannot stretch but can bend adaptively, so that the outlet of the second tube segment 8 and the third tube segment 9 tilt to the right; when the inner cavity 11 gradually becomes larger, the outlet of the second tube segment 8 and the third tube segment 9 continue to tilt to the right, and the angle between the first tube segment 7 and the third tube segment 9 gradually becomes smaller, thereby adjusting the injection angle of the plastic fluid.

[0044] In order to inflate the inner cavity 11, a first gas delivery channel 10 is opened inside the wall of the first pipe section 7, and the bottom end of the first gas delivery channel 10 is connected to the inner cavity 11. A ring sleeve 17 is arranged above the upper mold 4, and the ring sleeve 17 is fixedly connected to the first pipe section 7. The top end of the ring sleeve 17 is rotatably connected to a cover plate 18, and the cover plate 18 is rotatably connected to the first pipe section 7. A first air cavity 19 is formed between the cover plate 18 and the ring sleeve 17, and the top end of the first gas delivery channel 10 is connected to the first air cavity 19. A first electric push rod 22 is fixedly connected to the top of the upper mold 4, and a support plate 20 is fixedly connected to the telescopic end of the first electric push rod 22, and the support plate 20 is rotatably connected to the first pipe section 7. A connecting rod 21 is fixedly connected to the lower surface of the supporting plate 20, and the bottom end of the connecting rod 21 is fixedly connected to the cover plate 18, so that the cover plate 18 does not rotate. The cover plate 18 and the ring sleeve 17 are provided so that when the first pipe section 7 is in a rotating state, the first gas delivery channel 10 and the first gas cavity 19 remain in a communicating state.

[0045] The operating table 1 is fixedly connected to a pump body 26, and the pump body 26 can be switched between a blow mode and a suction mode. The first air cavity 19 is connected and coordinated with the pump body 26. When in use, a gas pipeline is provided between the pump body 26 and the first air cavity 19, and a solenoid valve is installed on the gas pipeline to control the connection state of the gas pipeline.

[0046] A rotating plate 13 is fixedly connected to the top of the circular groove 5 , and a through slot is opened on the rotating plate 13 for the first pipe section 7 to pass through. The first pipe section 7 is rotatably connected to the rotating plate 13 , and the first pipe section 7 can rotate on the rotating plate 13 and can also slide on the rotating plate 13 .

[0047] A driving assembly for driving the ring sleeve 17 to rotate is arranged below the support plate 20, and the driving assembly includes a motor 23, a gear 24 and a ring gear 25. The motor 23 is fixedly connected to the lower surface of the support plate 20, the gear 24 is fixedly connected to the driving shaft of the motor 23, and the ring gear 25 is fixedly connected to the outside of the ring sleeve 17, and the gear 24 and the ring gear 25 are meshed and connected.

[0048] In actual use, the plastic fluid is transported to the interior of the molding cavity 3 by the first pipe section 7 , the second pipe section 8 , and the third pipe section 9 .

[0049] The pump body 26 is started and controlled to be in the air supply mode, and the first gas delivery channel 10 delivers gas to the inner cavity 11, so that the inner cavity 11 is inflated and expanded, and the second pipe section 8 is bent and deformed to the right side (refer to Fig. 9 ), that is, the outlet of the second pipe section 8 and the third pipe section 9 are inclined.

[0050] Start the motor 23, the motor 23 drives the gear 24 to rotate, and since the gear 24 is meshed with the ring gear 25, the ring gear 25 drives the first pipe section 7 to rotate through the ring sleeve 17, and the second pipe section 8 and the third pipe section 9 rotate synchronously, and the plastic fluid is injected in a rotational manner to expand the injection range.

[0051] The gas is slowly filled into the inner cavity 11, so that the inner cavity 11 gradually becomes larger, and the second tube section 8 continues to bend and deform toward the right side (refer to Fig. 9 ), the angle between the first pipe section 7 and the third pipe section 9 gradually becomes smaller, and gradually transitions from spraying to the middle of the molding cavity 3 to spraying to the edge of the molding cavity 3, adjusting the injection angle of the plastic fluid, and further expanding the injection range, so that the plastic fluid can be quickly and evenly injected into the molding cavity 3, improving the injection speed and molding quality, making the material of the sheet after molding more uniform, and ensuring the effect of electroplating.

[0052] Furthermore, the first electric push rod 22 and the support plate 20 can also be used to drive the first pipe section 7 to move up and down to adjust the injection height position.

[0053] In addition, when the inner cavity 11 becomes larger, the inner wall of the second pipe section 8 will shrink due to the inflation of the inner cavity 11, and the cross-sectional area will become smaller. That is, in the process of gradually transitioning from spraying to the middle of the molding cavity 3 to spraying to the edge of the molding cavity 3, the flow rate of the plastic fluid gradually increases and the spraying distance becomes longer, ensuring that it can be sprayed to the edge of the molding cavity 3, further improving the uniformity of injection molding.

[0054] The circular groove 5 is slidably connected with a slide plate 12, which can slide and rotate inside the circular groove 5, and a rubber ring can be arranged between the slide plate 12 and the inner wall of the circular groove 5 to reduce wear and improve sealing. The slide plate 12 is provided with a through groove for the first pipe section 7 to pass through, and the first pipe section 7 is fixedly connected to the slide plate 12. A recovery groove 15 is provided on the inner wall at the bottom end of the circular groove 5, and a first air bag 16 is fixedly connected inside the recovery groove 15. A second gas delivery channel 14 is provided inside the wall of the upper mold 4, and one end of the second gas delivery channel 14 is connected to the top of the circular groove 5, and the other end of the second gas delivery channel 14 is connected to the first air bag 16.

[0055] Considering that after long-term use, due to wear and other reasons, the sealing of the upper mold 4 and the lower mold 2 is affected, and the docking part is prone to leakage, etc., a frame-shaped groove 34 is opened on the upper surface of the lower mold 2, and the frame-shaped groove 34 surrounds the outer side of the molding cavity 3. The second airbag 27 is fixedly connected inside the frame-shaped groove 34, and the second airbag 27 is connected and matched with the pump body 26. When used specifically, a gas pipeline is provided between the pump body 26 and the second airbag 27, and a solenoid valve is installed on the gas pipeline to control the connection state of the gas pipeline.

[0056] A second air cavity 31 is provided in the lower half of the lower mold 2, and a square groove 28 is provided at the bottom of the molding cavity 3, and the molding cavity 3 is connected to the second air cavity 31 through the square groove 28. A top block 29 is slidably provided inside the square groove 28, and a second electric push rod 30 is fixedly connected to the bottom of the second air cavity 31, and the top block 29 is fixedly connected to the telescopic end of the second electric push rod 30, and the second air cavity 31 is connected and matched with the pump body 26. When in use, a gas pipeline is provided between the pump body 26 and the second air cavity 31, and a solenoid valve is installed on the gas pipeline to control the connection state of the gas pipeline.

[0057] Before injection molding, the telescopic end of the third electric push rod 32 is controlled to extend to drive the upper mold 4 to move downward, and a certain gap is reserved between the upper mold 4 and the lower mold 2, and the gap is small, such as: 0.1 cm; then the pump body 26 is started, and the pump body 26 is controlled to be in the air supply mode to transport gas to the inside of the second airbag 27, so that the second airbag 27 expands and abuts against the bottom of the upper mold 4, and the second airbag 27 remains in an expanded state.

[0058] The telescopic end of the second electric push rod 30 is controlled to be recovered, driving the top block 29 to move downward, the square groove 28 is opened, the molding cavity 3, the square groove 28 and the second air cavity 31 are connected, and at this time the first air bag 16 extends outward from the inside of the recovery groove 15 to close the bottom end of the circular groove 5; then the pump body 26 is started, and the pump body 26 is controlled to be in the suction mode to suck the gas inside the second air cavity 31, the square groove 28 and the molding cavity 3 to form a vacuum state; then the telescopic end of the second electric push rod 30 is controlled to extend, driving the top block 29 to move upward, the square groove 28 is closed, and the top end of the top block 29 is flush with the bottom end of the molding cavity 3.

[0059] Furthermore, the second airbag 27 expands between the upper mold 4 and the lower mold 2 to ensure the vacuum suction effect.

[0060] Since the molding cavity 3 is in a vacuum state at this time, bubbles can be prevented from being generated, and the surface of the sheet after molding is smoother. At the same time, the density and strength of the sheet are improved, further ensuring the effect of electroplating.

[0061] The telescopic end of the first electric push rod 22 is controlled to be retracted, and the first pipe section 7 is driven to move downward through the support plate 20, and the second pipe section 8 and the third pipe section 9 are moved downward synchronously, and the first pipe section 7 drives the slide plate 12 to slide downward inside the circular groove 5, and the distance between the slide plate 12 and the rotating plate 13 is expanded, so that the gas inside the first airbag 16 is sucked through the second gas delivery channel 14, so that the first airbag 16 is recovered into the inside of the recovery groove 15, and the bottom end of the circular groove 5 is opened.

[0062] The second pipe section 8 and the third pipe section 9 continue to move downward and extend into the interior of the molding cavity 3 .

[0063] After the injection molding is completed, the telescopic end of the first electric push rod 22 is controlled to extend, and the first pipe section 7 is driven to move upward through the support plate 20, and the second pipe section 8 and the third pipe section 9 are moved upward synchronously, and the first pipe section 7 drives the slide plate 12 to slide upward inside the circular groove 5, and the distance between the slide plate 12 and the rotating plate 13 is reduced, so that the gas inside the circular groove 5 flows back from the second gas delivery channel 14 to the inside of the first airbag 16, the first airbag 16 expands and extends outward from the inside of the recovery groove 15, the bottom end of the circular groove 5 is closed, and the second pipe section 8 and the third pipe section 9 are all recovered to the inside of the circular groove 5, without affecting the cooling molding.

[0064] After cooling and forming, the gas inside the second airbag 27 is released, the second airbag 27 shrinks and becomes smaller, and the external gas enters the gap between the upper mold 4 and the lower mold 2, thereby releasing the vacuum state between the upper mold 4 and the lower mold 2, and controlling the telescopic end of the third electric push rod 32 to retract, thereby driving the upper mold 4 to move upward and reset.

[0065] The telescopic end of the second electric push rod 30 is controlled to extend, driving the ejector block 29 to move upward, ejecting the formed sheet material, and assisting demoulding.

[0066] Embodiment 2, the present invention provides as Fig.11 In the electroplated sheet injection molding device shown, the thickness of the inner wall of the inner cavity 11 gradually increases from the middle of the inner cavity 11 to the upper and lower sides.

[0067] Specifically, when the inner cavity 11 is inflated, the inner cavity 11 expands. Since the inner wall thickness in the middle of the inner cavity 11 is relatively thin, the overall deformation of the inner cavity 11 presents: the degree of deformation due to pulling up and down is smaller than the degree of deformation due to pulling left and right. At this time, the bending deformation is not obvious, and the internal cross-sectional area of ​​the second pipe segment 8 will be greatly reduced, so as to control the instantaneous flow rate of the plastic fluid, and the liquid can be cut off when the inner cavity 11 expands greatly.

[0068] Furthermore, the thickness of the inner wall of the inner cavity 11 at any position can be set to be different to achieve different effects. For example, the inner wall thickness on the side close to the interior of the second pipe segment 8 is thicker, while the inner wall thickness on the side away from the interior of the second pipe segment 8 is thinner. At this time, the impact on the internal cross-sectional area of ​​the second pipe segment 8 is small and can be adjusted according to specific usage conditions.

[0069] Working principle: Control the telescopic end of the third electric push rod 32 to extend, drive the upper mold 4 to move downward, and reserve a certain gap between the upper mold 4 and the lower mold 2; then start the pump body 26, and control the pump body 26 to be in the air supply mode, and deliver gas to the inside of the second airbag 27, so that the second airbag 27 expands and abuts against the bottom of the upper mold 4, and keeps the second airbag 27 in an expanded state.

[0070] The telescopic end of the second electric push rod 30 is controlled to be recovered, driving the top block 29 to move downward, the square groove 28 is opened, the molding cavity 3, the square groove 28 and the second air cavity 31 are connected, and at this time the first air bag 16 extends outward from the inside of the recovery groove 15 to close the bottom end of the circular groove 5; then the pump body 26 is started, and the pump body 26 is controlled to be in the suction mode to suck the gas inside the second air cavity 31, the square groove 28 and the molding cavity 3 to form a vacuum state; then the telescopic end of the second electric push rod 30 is controlled to extend, driving the top block 29 to move upward, the square groove 28 is closed, and the top end of the top block 29 is flush with the bottom end of the molding cavity 3.

[0071] The telescopic end of the first electric push rod 22 is controlled to be retracted, and the first pipe section 7 is driven to move downward through the support plate 20, and the second pipe section 8 and the third pipe section 9 are moved downward synchronously, and the first pipe section 7 drives the slide plate 12 to slide downward inside the circular groove 5, and the distance between the slide plate 12 and the rotating plate 13 is expanded, so that the gas inside the first airbag 16 is sucked through the second gas delivery channel 14, so that the first airbag 16 is recovered to the inside of the recovery groove 15, and the bottom end of the circular groove 5 is opened; the second pipe section 8 and the third pipe section 9 continue to move downward and extend into the interior of the molding cavity 3.

[0072] Take Example 1 as an example: the first pipe section 7, the second pipe section 8, and the third pipe section 9 convey plastic fluid to the interior of the molding cavity 3. The pump body 26 is started and controlled to be in the air supply mode, and the first gas delivery channel 10 conveys gas to the interior of the inner cavity 11, so that the inner cavity 11 is inflated and expanded, and the second pipe section 8 is bent and deformed to the right (refer to Fig. 9 ), that is, the outlet of the second pipe section 8 and the third pipe section 9 are tilted; start the motor 23, the motor 23 drives the gear 24 to rotate, and because the gear 24 and the ring gear 25 are meshed and connected, the ring gear 25 drives the first pipe section 7 to rotate through the ring sleeve 17, and the second pipe section 8 and the third pipe section 9 rotate synchronously, and the plastic fluid is injected in a rotating manner to expand the injection range. And continue to slowly fill the inner cavity 11 with gas, so that the inner cavity 11 gradually becomes larger, and the second pipe section 8 will continue to bend and deform to the right (refer to Fig. 9 ), the angle between the first pipe section 7 and the third pipe section 9 gradually becomes smaller, and gradually transitions from spraying toward the middle of the molding cavity 3 to spraying toward the edge of the molding cavity 3, adjusting the injection angle of the plastic fluid, and further expanding the injection range, so that the plastic fluid can be quickly and evenly injected into the molding cavity 3, improving the injection speed and molding quality, making the material of the sheet after molding more uniform, and ensuring the effect of electroplating; and in this process, the first pipe section 7 can also be driven up and down by the first electric push rod 22 and the support plate 20 to adjust the injection height position.

[0073] Since the molding cavity 3 is in a vacuum state at this time, bubbles can be prevented from being generated, and the surface of the sheet after molding is smoother. At the same time, the density and strength of the sheet are improved, further ensuring the effect of electroplating.

[0074] In addition, when the inner cavity 11 becomes larger, the inner wall of the second pipe section 8 will shrink due to the inflation of the inner cavity 11, and the cross-sectional area will become smaller. That is, in the process of gradually transitioning from spraying to the middle of the molding cavity 3 to spraying to the edge of the molding cavity 3, the flow rate of the plastic fluid gradually increases, and the spraying distance becomes longer, further improving the uniformity of injection molding.

[0075] After the injection molding is completed, the telescopic end of the first electric push rod 22 is controlled to extend, and the first pipe section 7 is driven to move upward through the support plate 20, and the second pipe section 8 and the third pipe section 9 are moved upward synchronously, and the first pipe section 7 drives the slide plate 12 to slide upward inside the circular groove 5, and the distance between the slide plate 12 and the rotating plate 13 is reduced, so that the gas inside the circular groove 5 flows back from the second gas delivery channel 14 to the inside of the first airbag 16, the first airbag 16 expands and extends outward from the inside of the recovery groove 15, the bottom end of the circular groove 5 is closed, and the second pipe section 8 and the third pipe section 9 are all recovered to the inside of the circular groove 5, without affecting the cooling molding.

[0076] After cooling and forming, the gas inside the second airbag 27 is released, the second airbag 27 shrinks and becomes smaller, and the external gas enters the gap between the upper mold 4 and the lower mold 2, thereby releasing the vacuum state between the upper mold 4 and the lower mold 2, and controlling the telescopic end of the third electric push rod 32 to retract, thereby driving the upper mold 4 to move upward and reset.

[0077] The telescopic end of the second electric push rod 30 is controlled to extend, driving the ejector block 29 to move upward, ejecting the formed sheet material, and assisting demoulding.

Claims

1. A process for injection molding of electroplated sheets, characterized in that: The steps include: S1. Suction: After the mold is closed, the inside of the mold is sucked into a vacuum state; S2, Injection: Rotate and inject plastic fluid into the mold, and adjust the injection angle and flow rate, so that the plastic fluid is evenly distributed inside the mold; S3, demoulding: After molding, release the vacuum state and complete demoulding.

2. An electroplated sheet injection molding device, characterized in that: The electroplated sheet injection molding process as claimed in claim 1 further comprises an operating table (1), above which is arranged a delivery pipe (6) for rotatably delivering plastic fluid, wherein the delivery pipe (6) comprises a second pipe section (8), wherein an inner cavity (11) is arranged inside the wall of the second pipe section (8), and when the inner cavity (11) is inflated, the outlet of the second pipe section (8) is tilted to adjust the injection angle of the plastic fluid, and at the same time, the inner wall of the second pipe section (8) is contracted, the flow rate of the plastic fluid is accelerated, and the injection distance becomes longer.

3. The electroplating sheet injection molding equipment according to claim 2, characterized in that: The inner cavity (11) is provided with at least one.

4. The electroplating sheet injection molding equipment according to claim 2, characterized in that: The inner cavity (11) is arranged on one side of the wall of the second pipe section (8).

5. The electroplated sheet injection molding equipment according to claim 2, characterized in that: The thickness of the inner wall of the inner cavity (11) gradually decreases from the middle of the inner cavity (11) toward the upper and lower sides.

6. The electroplating sheet injection molding equipment according to claim 2, characterized in that: The thickness of the inner wall of the inner cavity (11) gradually increases from the middle of the inner cavity (11) toward the upper and lower sides.

7. The electroplated sheet material injection molding device according to claim 2, characterized in that: The delivery pipeline (6) further comprises a first pipe section (7) and a third pipe section (9); the first pipe section (7) is connected to the top end of the second pipe section (8), and the first pipe section (7) is butt-jointed with a factory plastic fluid pipeline; the third pipe section (9) is connected to the bottom end of the second pipe section (8).

8. The electroplated sheet material injection molding device according to claim 7, characterized in that: An upper mold (4) is arranged above the operating table (1), a circular groove (5) is provided on the upper mold (4), and the circular groove (5) passes through the upper and lower surfaces of the upper mold (4), and a conveying pipe (6) is arranged in the circular groove (5). A lower mold (2) is fixedly connected to the top of the operating table (1), and the lower mold (2) is located below the upper mold (4). A molding cavity (3) is arranged on the top of the lower mold (2).

9. The electroplated sheet material injection molding device according to claim 8, characterized in that: A first gas delivery channel (10) is provided inside the wall of the first pipe section (7), and the bottom end of the first gas delivery channel (10) is communicated with the inner cavity (11). A ring sleeve (17) is provided above the upper mold (4), and the ring sleeve (17) is fixedly connected to the first pipe section (7). A cover plate (18) is rotatably connected to the top of the ring sleeve (17), and the cover plate (18) is rotatably connected to the first pipe section (7). A first air cavity (19) is formed between the cover plate (18) and the ring sleeve (17), and the top end of the first gas delivery channel (10) is communicated with the first air cavity (19). A pump body (26) is fixedly connected inside the operating table (1), and the first air cavity (19) is communicated with the pump body (26). A driving component for driving the ring sleeve (17) to rotate is provided below the support plate (20).

10. The electroplated sheet material injection molding device according to claim 9, characterized in that: A rotating plate (13) is fixedly connected to the top of the circular groove (5), and a through groove is provided on the rotating plate (13) for the first pipe section (7) to pass through. The first pipe section (7) is rotatably connected to the rotating plate (13). A first electric push rod (22) is fixedly connected to the top of the upper mold (4). A support plate (20) is fixedly connected to the telescopic end of the first electric push rod (22). The support plate (20) is rotatably connected to the first pipe section (7). A connecting rod (21) is fixedly connected to the lower surface of the supporting plate (20), and the bottom end of the connecting rod (21) is fixedly connected to the cover plate (18).

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