Rapid forming process of ultrathin low-residual-stress injection molding part

Abstract

The invention discloses a rapid forming process of an ultrathin low-residual-stress injection molding part, and relates to the technical field of injection molding machines. The method comprises the following steps; mounting accessories; heating the plastic particles; performing injection molding; cooling and demolding; performing ultrasonic separation; polishing the injection molded part; and packaging and warehousing. A plurality of groups of grinding balls in the grinding box are driven to vibrate through vibration of an ultrasonic oscillation pipe, and when a to-be-injection-molded part falls into the grinding box, heat is generated through vibration friction between the grinding balls and friction between the grinding balls and the injection-molded part, so that the temperature of the injection-molded part is increased, residual stress during injection molding is released, and the injection molding quality is improved. Through the arrangement of the assembly, the problem that internal stress is too large after an injection molding part is formed is effectively avoided, the effect of releasing internal stress can be achieved, meanwhile, the quality of the injection molding part is improved, the injection molding part is prevented from being broken, and the ultrathin part can be polished during production; and the corresponding labor cost is reduced, and the corresponding grinding time is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machines, and in particular to a rapid prototyping process for ultra-thin low-residual stress injection molded parts. Background Art

[0002] Ultra-thin automotive injection molding parts are becoming an important trend in the automotive industry, especially in the context of increasing demand for lightweight and energy-saving and environmental protection. Through advanced injection molding technology, these ultra-thin parts can not only reduce the weight of the vehicle, but also optimize production costs. Commonly used materials include polypropylene (PP), polyamide (PA), etc., which can meet the strength and temperature resistance requirements. Ultra-thin injection molding parts are widely used in automotive exteriors, instrument panels and other parts, which not only improves the appearance design of the vehicle, but also improves manufacturing efficiency, becoming an indispensable part of automobile manufacturing. The stress that ultra-thin injection molding parts bear during the injection molding process is mainly caused by factors such as uneven material flow and cooling rate differences. Due to the thin wall of ultra-thin injection molding parts, temperature differences often occur during the cooling process, resulting in the generation of residual stress, which in turn affects the strength and shape of the parts, and may even cause deformation, cracks or fractures. Therefore, it is necessary to remove the stress of ultra-thin injection molding parts.

[0003] In the literature (publication number: CN114311482B), injection foaming production equipment and production process for automotive soft-touch interior trim are disclosed. The device starts the flip motor to drive the flip shaft to move, and drives the lower molding die to rotate and the second driving gear to move through the flip shaft. At the same time, the second driving gear drives the second driven gear, and the second driven gear drives the pushing screw to move, and the pushing screw drives the inner limit side rail to be recovered on the inner side of the inner limit plate, thereby releasing the blocking of the lower molding die, so that the lower molding die can be flipped smoothly. After the flip, the workpiece formed inside the lower molding die falls on the guide plate for buffering and is exported through the conveyor belt. However, in actual use, the device cannot achieve the removal of residual stress in the molded parts after molding. Since the injection molded parts have thin walls during the injection molding process, temperature differences often occur during the cooling process, resulting in residual stress, which will cause the injection molded parts to break during use, and cannot improve the quality of the injection molded parts. At the same time, since the injection molded parts will produce burrs and excess plastic during injection molding, they need to be polished before they can be packaged and put into storage, which increases the corresponding polishing cost and processing time. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems and provide a rapid prototyping process for ultra-thin low residual stress injection molded parts.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: A rapid prototyping process for ultra-thin low residual stress injection molded parts comprises the following steps: S1. Accessories installation; S2, heating of plastic particles; S3, injection molding; S4, cooling and demoulding; S5, ultrasonic separation; S6, polishing of injection molded parts; S7. Packing and storage.

[0006] Furthermore, the above-mentioned S1, accessories installation: first, according to production needs, open the sliding door, pull the sliding door into the shell, install the demolding module to one side of the fixed plate, install the corresponding male mold to one end of the adjusting rod, and install the corresponding female mold to the inside of the fixed block, so that one end of the feed tube is fitted with the female mold, and the auxiliary rod is inserted into the inside of the female mold, thereby fixing the female mold, so that one end of the demolding rod and the male mold are in the same horizontal plane, and the demolding rod is slidably inserted into the inside of the male mold. At this time, the male mold and the female mold are in the same horizontal plane.

[0007] Furthermore, the above-mentioned S2, heating of plastic particles: the heating machine is installed on the upper surface of the heating table through the base, and the feeding hopper is installed at the feeding port of the heating machine. When adding plastic particles, the plastic particles are added to the interior of the heating machine through the feeding hopper, and the screw is driven by the servo motor to rotate inside the feeding pipe. The plastic particles are heated by the heating machine, so that the liquefied plastic gradually flows downward following the screw thread and gravity, and the bubbles inside it are discharged to the outside of the heating machine through the feeding hopper, and the liquefied plastic is transferred to the inside of the feeding pipe through the connecting pipe, thereby heating and liquefying the plastic particles and discharging the bubbles inside them.

[0008] Furthermore, the above-mentioned S3, injection molding: debug each accessory through the control panel, start the stepper motor to drive the adjusting rod to move horizontally, and then drive the male mold to move horizontally, so that the male mold and the female mold fit together, and after closing the sliding door, start the hydraulic rod to drive the push rod to move horizontally along the inner wall of the feed pipe, thereby pushing the plastic liquid flowing from the connecting pipe into the interior of the female mold, as the push rod gradually goes deeper, the pressure inside the feed pipe increases, thereby pushing the plastic liquid inside the feed pipe to gradually squeeze into the heating pipe, and reheating the plastic liquid through the heating pipe to prevent the plastic liquid from cooling and solidifying, so that the inner walls of the female mold and the male mold are filled with plastic liquid, and the plastic liquid is formed into a specific shape through the male mold and the female mold.

[0009] Furthermore, the above-mentioned S4, cooling and demolding: after the plastic liquid is completely filled into the male mold and the female mold, cooling water is passed through the inside of the male mold through the cooling pipe to cool it down, so that the plastic liquid inside the male mold is solidified and formed, and the adjusting rod and the male mold are driven by the stepping motor to return to their original position. At this time, the injection molded part is attached to the inner wall of the male mold, and the electric telescopic rod 1 is started. The demolding module and the demolding rod are driven by the electric telescopic rod 1 to move horizontally, so that one end of the demolding rod gradually separates the molded injection molded part from the inner wall of the male mold, thereby demolding the injection molded part.

[0010] Furthermore, the above-mentioned S5, ultrasonic separation: after the injection molded part is demolded, the injection molded part falls onto the upper surface of the ultrasonic oscillation tube by gravity, and the two sets of electric telescopic rods 2 are started. The electric telescopic rods 2 drive the reciprocating plate to move horizontally along the inner wall of the injection molding table, so that the spring is stretched. When the electric telescopic rods 2 move to the maximum value, the electric telescopic rods 2 are stopped, and the reciprocating plate is restored to its original position by the elastic force of the spring, so that the reciprocating plate performs horizontal reciprocating motion on the surface of the blanking plate, and the center of the injection molded part is fit with the ultrasonic oscillation tube by the reciprocating plate. The injection molded part is adsorbed by the suction port so that the injection molded part is tightly fit with the upper surface of the ultrasonic oscillation tube, and the ultrasonic oscillation tube is started. The vibration generated by the ultrasonic oscillation tube separates the injection molded part from the center connection, thereby separating multiple groups of ultra-thin parts on the injection molded part, and the injection molded part falls into the interior of the polishing box by the action of gravity and the reciprocating motion of the reciprocating plate.

[0011] Furthermore, the above-mentioned S6, polishing of injection molded parts: the vibration of the ultrasonic oscillation tube drives multiple groups of polishing balls inside the polishing box to vibrate, and when the injection molded parts fall into the polishing box, heat is generated by the vibration friction between the polishing balls and the friction between the polishing balls and the injection molded parts, so that the temperature of the injection molded parts rises, and the residual stress during injection molding is released, thereby avoiding excessive stress inside the injection molded parts to cause fracture, and the injection molded parts are polished by the friction between the polishing balls and the injection molded parts, thereby trimming the burrs of the injection molded parts.

[0012] Furthermore, the above-mentioned S7, packaging and warehousing: the injection molded parts are gradually moved to the right side of the polishing box through vibration friction, and the feed belt is started, which drives multiple sets of inclined plates on its surface to climb back and forth, thereby carrying the injection molded parts and polishing balls to climb, and the polishing balls fall into the interior of the polishing box through the center of the gap between the two sets of inclined plates. Since the volume of the injection molded parts is larger than that of the polishing balls, the polishing balls will move to the upper surface of the conveyor belt along with the feed belt and the inclined plate, and be transported by the conveyor belt for subsequent packaging and warehousing.

[0013] The beneficial effects of the present invention are as follows: 1. The present invention drives multiple groups of grinding balls inside the grinding box to vibrate through the vibration of the ultrasonic oscillation tube. When the injection-molded parts fall into the grinding box, heat is generated by the vibration friction between the grinding balls and the friction between the grinding balls and the injection-molded parts, which increases the temperature of the injection-molded parts and releases the residual stress during injection molding. The injection-molded parts are polished by the friction between the grinding balls and the injection-molded parts, thereby trimming the burrs of the injection-molded parts. The setting of this component effectively avoids the problem of excessive internal stress of the injection-molded parts after molding, and can achieve the effect of releasing internal stress. At the same time, it improves the quality of the injection-molded parts and avoids the fracture of the injection-molded parts. It can also polish ultra-thin parts during production, reducing the corresponding labor cost and the corresponding polishing time.

[0014] 2. After the injection molded part is demoulded, the injection molded part falls onto the upper surface of the ultrasonic oscillation tube by gravity, and the two sets of electric telescopic rods 2 are started. The electric telescopic rods 2 drive the reciprocating plate to move horizontally along the inner wall of the injection molding table, so that the spring is stretched. When the electric telescopic rods 2 move to the maximum value, the electric telescopic rods 2 are stopped, and the reciprocating plate is restored to its original position by the elastic force of the spring, so that the reciprocating plate performs horizontal reciprocating motion on the surface of the blanking plate. The reciprocating plate makes the center of the injection molded part fit with the ultrasonic oscillation tube, and the injection molded part is adsorbed by the suction port so that the injection molded part is aligned with the upper surface of the ultrasonic oscillation tube. The surface is tightly fitted, and the ultrasonic oscillation tube is started. The vibration generated by the ultrasonic oscillation tube separates the injection molded part from the central connection, thereby separating multiple groups of ultra-thin parts on the injection molded part. Through the action of gravity and the reciprocating motion of the reciprocating plate, the injection molded part falls into the interior of the polishing box. The setting of this component effectively avoids the problem of manual separation of the injection molded part from the connection after molding, and can achieve the effect of automatic separation through ultrasonic oscillation. At the same time, the corresponding processing time is reduced, the separation efficiency is improved, and the damage to the injection molded part caused by manual separation can be avoided during actual use.

[0015] 3. The present invention installs the heating machine to the upper surface of the heating table through the base, and installs the feeding hopper to the feeding port of the heating machine. When adding plastic particles, the plastic particles are added to the interior of the heating machine through the feeding hopper, and the screw is driven to rotate inside the feeding pipe by the servo motor. The plastic particles are heated by the heating machine, so that the liquefied plastic gradually flows downward following the screw thread and the action of gravity, and the bubbles inside it are discharged to the outside of the heating machine through the feeding hopper, and the liquefied plastic is transferred to the interior of the feeding pipe through the connecting pipe, so that the plastic particles are heated and liquefied and the bubbles inside them are discharged. The setting of this component effectively avoids the problem of bubbles contained in the liquid plastic during injection molding, and can achieve the effect of automatically removing bubbles. At the same time, it improves the quality of the injection molded parts, avoids bubbles affecting the molding of the injection molded parts, and can also improve the yield rate of the injection molded parts during actual use, which is also conducive to the widespread promotion of the injection molding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This invention Figure 1 Rear view structure diagram; Figure 3 This invention Figure 1 Look directly at the schematic diagram of the internal structure; Figure 4 This invention Figure 3 Rear view cross-sectional structure diagram; Figure 5 This invention Figure 1 Schematic diagram of the structure from above; Figure 6 This invention Figure 5 Schematic diagram of the local structure from the left.

[0017] Figure numerals: 1. Heating table; 11. Base; 12. Heating machine; 13. Feeding hopper; 14. Heating tube; 15. Auxiliary rod; 16. Control panel; 17. Sliding door; 18. Male mold; 19. Female mold; 110. Fixed block; 2. Injection molding table; 21. Cooling tube; 22. Housing; 23. Stepper motor; 24. Adjusting rod; 25. Fixed plate; 26. Demolding module; 27. Demolding rod; 28. Electric telescopic rod 1; 3. Feeding pipe; 31. Connecting pipe; 32. Feeding pipe; 33. Push rod; 34. Servo motor; 35. Hydraulic rod; 36. Screw; 4. Grinding box; 41. Conveyor belt; 42. Feeding belt; 43. Inclined plate; 44. Grinding ball; 45. Spring; 46. Suction port; 47. Ultrasonic oscillation tube; 48. Electric telescopic rod 2; 49. Reciprocating plate; 410. Blanking plate. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0019] Example 1, as Figures 1-6 As shown, a rapid prototyping process for ultra-thin low residual stress injection molded parts comprises the following steps: S1. Accessories installation; S2, heating of plastic particles; S3, injection molding; S4, cooling and demoulding; S5, ultrasonic separation; S6, polishing of injection molded parts; S7. Packing and storage.

[0020] Example 2, as Figure 1 、 Figure 5 As shown, on the basis of the above embodiment, it also includes the above-mentioned S1, accessory installation: first, according to production needs, open the sliding door 17, pull the sliding door 17 into the shell 22, install the stripping module 26 to one side of the fixed plate 25, install the corresponding male mold 18 to one end of the adjusting rod 24, and install the corresponding female mold 19 to the inside of the fixed block 110, so that one end of the feed pipe 3 is in contact with the female mold 19, and the auxiliary rod 15 is inserted into the inside of the female mold 19, thereby fixing the female mold 19, so that one end of the stripping rod 27 and the male mold 18 are in the same horizontal plane, so that the stripping rod 27 is slidably inserted into the inside of the male mold 18. At this time, the male mold 18 and the female mold 19 are in the same horizontal plane, which can achieve the effect of quick replacement and installation of the mold. At the same time, after the installation is completed, the sliding door 17 can close the injection molding area to avoid high-temperature plastic from causing harm to the staff during injection molding, and also improve the safety of the device.

[0021] Example 3, as Figure 1 、 Figure 4 As shown, on the basis of the above embodiment, it also includes the above-mentioned S2, plastic particle heating: the heating machine 12 is installed on the upper surface of the heating table 1 through the base 11, and the feeding hopper 13 is installed at the feeding port of the heating machine 12. When adding plastic particles, the plastic particles are added to the interior of the heating machine 12 through the feeding hopper 13, and the screw 36 is driven by the servo motor 34 to rotate inside the feeding pipe 32. The plastic particles are heated by the heating machine 12, so that the liquefied plastic gradually flows downward following the thread of the screw 36 and the action of gravity, and the bubbles inside it are discharged to the outside of the heating machine 12 through the feeding hopper 13, and the liquefied plastic is transferred to the inside of the feeding pipe 3 through the connecting pipe 31, so that the plastic particles are heated and liquefied and the bubbles inside are discharged, thereby avoiding the influence of bubbles on subsequent injection molding, further improving the integrity of the injection molded parts, and also improving the yield of the production line.

[0022] Example 4, as Figure 1 、 Figure 4As shown, on the basis of the above embodiment, it also includes the above-mentioned S3, injection molding: debugging each accessory through the control console 16, starting the stepping motor 23 to drive the adjusting rod 24 to move horizontally, and then driving the male mold 18 to move horizontally, so that the male mold 18 and the female mold 19 are fitted together, and after closing the sliding door 17, the hydraulic rod 35 is started to drive the push rod 33 to move horizontally along the inner wall of the feeding pipe 3, thereby pushing the plastic liquid flowing from the connecting pipe 31 into the interior of the female mold 19, as the push rod 33 gradually penetrates, the internal pressure of the feeding pipe 3 increases, thereby pushing the plastic liquid inside the feeding pipe 3 to gradually squeeze into the heating pipe 14, and the heating pipe 14 reheats the plastic liquid to prevent the plastic liquid from cooling and solidifying, so that the inner walls of the female mold 19 and the male mold 18 are filled with plastic liquid, and the plastic liquid is formed into a specific shape by the male mold 18 and the female mold 19. Through the cooperation of the two sets of corresponding molds, the liquid plastic can be formed into the required accessories, meeting the production requirements of complex accessories and improving the functionality of the device.

[0023] Example 5, as Figure 1 、 Figure 5 As shown, on the basis of the above embodiment, it also includes the above-mentioned S4, cooling and demolding: after the plastic liquid is completely filled into the male mold 18 and the female mold 19, cooling water is passed through the cooling pipe 21 to cool it down inside the male mold 18, so that the plastic liquid inside the male mold 18 is solidified and formed, and the adjusting rod 24 and the male mold 18 are driven to return to their original positions by the stepping motor 23. At this time, the injection molded part is attached to the inner wall of the male mold 18, and the electric telescopic rod 28 is started. The electric telescopic rod 28 drives the stripping module 26 and the demolding rod 27 to move horizontally, so that one end of the demolding rod 27 gradually separates the molded injection molded part from the inner wall of the male mold 18, thereby demolding the injection molded part. The molded injection molded part is automatically demolded by the demolding rod 27, which improves the injection molding efficiency, avoids damage to the injection molded part caused by manual demolding, and also avoids the harm of high temperature to the staff, thereby improving the practicality and safety of the device.

[0024] Example 6: Figure 6As shown, on the basis of the above embodiment, it also includes the above S5, ultrasonic separation: after the injection molded part is demoulded, the injection molded part falls onto the upper surface of the ultrasonic vibration tube 47 by gravity, and the two sets of electric telescopic rods 48 are started. The electric telescopic rods 48 drive the reciprocating plate 49 to move horizontally along the inner wall of the injection molding table 2, so that the spring 45 is stretched. When the electric telescopic rods 48 move to the maximum value, the electric telescopic rods 48 are stopped, and the reciprocating plate 49 is restored to its original position by the elastic force of the spring 45, so that the reciprocating plate 49 performs horizontal reciprocating motion on the surface of the blanking plate 410, and the reciprocating plate 49 is brought into contact with the center of the injection molded part through the reciprocating plate 49. The oscillation tube 47 is fitted, and the injection molded part is adsorbed through the suction port 46, so that the injection molded part is tightly fitted with the upper surface of the ultrasonic oscillation tube 47, and the ultrasonic oscillation tube 47 is started. The vibration generated by the ultrasonic oscillation tube 47 separates the injection molded part from the central connection, thereby separating multiple groups of ultra-thin parts on the injection molded part, and the injection molded part falls into the interior of the polishing box 4 through the action of gravity and the reciprocating motion of the reciprocating plate 49, which can achieve the effect of automatically separating the accessories from the connection through ultrasonic oscillation. At the same time, the corresponding processing time is reduced, the separation efficiency is improved, and damage to the injection molded part caused by manual separation can also be avoided during actual use.

[0025] Example 7, as Figure 6 As shown, on the basis of the above embodiment, it also includes the above-mentioned S6, injection molded part polishing: the vibration of the ultrasonic oscillation tube 47 drives the multiple groups of polishing balls 44 inside the polishing box 4 to vibrate, and when the injection molded part falls into the polishing box 4, the vibration friction between the polishing balls 44 and the friction between the polishing balls 44 and the injection molded part generate heat, so that the temperature of the injection molded part rises, and the stress remaining during injection molding is released, thereby avoiding excessive internal stress of the injection molded part to cause fracture. The injection molded part is polished by the friction between the polishing balls 44 and the injection molded part, thereby trimming the burrs of the injection molded part, which can achieve the effect of releasing internal stress. At the same time, the quality of the injection molded part is improved, and the injection molded part is avoided from being fractured. Ultra-thin parts can also be polished during production, which reduces the corresponding labor cost and the corresponding polishing time.

[0026] Example eight, as Figure 6As shown, on the basis of the above embodiment, it also includes the above S7, packaging and warehousing: the injection molded parts are gradually moved to the right side of the polishing box 4 through vibration friction, and the feeding belt 42 is started. The feeding belt 42 drives multiple groups of inclined plates 43 on its surface to climb back and forth, thereby carrying the injection molded parts and polishing balls 44 to climb. The polishing balls 44 fall into the interior of the polishing box 4 through the center of the gap between the two groups of inclined plates 43. Since the volume of the injection molded parts is larger than that of the polishing balls 44, the polishing balls 44 will move with the feeding belt 42 and the inclined plates 43 to the upper surface of the conveyor belt 41, and be transported by the conveyor belt 41 for subsequent packaging and warehousing, which can achieve the effect of automatically collecting the polished and heat-treated injection molded parts, improve the corresponding collection efficiency, and also achieve the effect of automatically feeding the finished accessories without human participation.

[0027] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rapid prototyping process for ultra-thin low residual stress injection molded parts, characterized in that: The method includes the following steps: S1. Accessories installation; S2, heating of plastic particles; S3, injection molding; S4, cooling and demoulding; S5, ultrasonic separation; S6, polishing of injection molded parts; S7. Packing and storage.

2. A rapid prototyping process for ultra-thin low residual stress injection molded parts according to claim 1, characterized in that: The above S1, accessories installation: First, according to production needs, open the sliding door (17), pull the sliding door (17) into the shell (22), install the demolding module (26) on one side of the fixed plate (25), install the corresponding male mold (18) to one end of the adjustment rod (24), and install the corresponding female mold (19) into the inside of the fixed block (110), so that one end of the feed pipe (3) is in contact with the female mold (19), and the auxiliary rod (15) is plugged into the inside of the female mold (19), thereby fixing the female mold (19), so that one end of the demolding rod (27) and the male mold (18) are in the same horizontal plane, so that the demolding rod (27) is slidably plugged into the inside of the male mold (18), and at this time the male mold (18) and the female mold (19) are in the same horizontal plane.

3. The rapid prototyping process for ultra-thin low residual stress injection molded parts according to claim 1, characterized in that: The above-mentioned S2, heating of plastic particles: the heating machine (12) is installed on the upper surface of the heating table (1) through the base (11), and the feeding hopper (13) is installed at the feeding port of the heating machine (12). When adding plastic particles, the plastic particles are added to the interior of the heating machine (12) through the feeding hopper (13), and the screw (36) is driven to rotate inside the feeding pipe (32) by the servo motor (34). The plastic particles are heated by the heating machine (12), so that the liquefied plastic gradually flows downward following the thread of the screw (36) and the action of gravity, and the bubbles inside the plastic are discharged to the outside of the heating machine (12) through the feeding hopper (13), and the liquefied plastic is transferred to the interior of the feeding pipe (3) through the connecting pipe (31), thereby heating and liquefying the plastic particles and discharging the bubbles inside the plastic particles.

4. The rapid prototyping process for ultra-thin low residual stress injection molded parts according to claim 1, characterized in that: The above-mentioned S3, injection molding: debug each accessory through the control panel (16), drive the adjustment rod (24) to move horizontally by starting the stepping motor (23), and then drive the male mold (18) to move horizontally, so that the male mold (18) and the female mold (19) fit together, and after closing the sliding door (17), drive the push rod (33) to move horizontally along the inner wall of the feed pipe (3) by starting the hydraulic rod (35), so that the plastic liquid flowing from the connecting pipe (31) is pushed into the interior of the female mold (19), as the push rod (33) gradually goes deeper, the internal pressure of the feed pipe (3) increases, thereby pushing the plastic liquid inside the feed pipe (3) to gradually squeeze into the heating pipe (14), and the plastic liquid is heated again by the heating pipe (14) to prevent the plastic liquid from cooling and solidifying, so that the inner walls of the female mold (19) and the male mold (18) are filled with plastic liquid, and the plastic liquid is formed into a specific shape through the male mold (18) and the female mold (19).

5. The rapid prototyping process for ultra-thin low residual stress injection molded parts according to claim 1, characterized in that: The above-mentioned S4, cooling and demoulding: after the plastic liquid is completely filled into the male mold (18) and the female mold (19), cooling water is passed through the inside of the male mold (18) through the cooling pipe (21) to cool it down, so that the plastic liquid inside the male mold (18) is solidified and formed, and the adjusting rod (24) and the male mold (18) are driven by the stepping motor (23) to return to their original positions. At this time, the injection molded part is attached to the inner wall of the male mold (18), and the electric telescopic rod (28) is started. The stripping module (26) and the demoulding rod (27) are driven by the electric telescopic rod (28) to move horizontally, so that one end of the demoulding rod (27) gradually separates the molded injection molded part from the inner wall of the male mold (18), thereby demoulding the injection molded part.

6. The rapid prototyping process for ultra-thin low residual stress injection molded parts according to claim 1, characterized in that: The above S5, ultrasonic separation: After the injection molded part is demoulded, the injection molded part falls onto the upper surface of the ultrasonic oscillation tube (47) by gravity, and the two sets of electric telescopic rods (48) are started. The electric telescopic rods (48) drive the reciprocating plate (49) to move horizontally along the inner wall of the injection molding table (2), so that the spring (45) is stretched. When the electric telescopic rods (48) move to the maximum value, the electric telescopic rods (48) are stopped, and the reciprocating plate (49) is restored to its original position by the elastic force of the spring (45), so that the reciprocating plate (49) is on the blanking plate (410). ) is horizontally reciprocated on the surface of the injection molded part, and the center of the injection molded part is fitted with the ultrasonic oscillation tube (47) through the reciprocating plate (49), and the injection molded part is adsorbed through the suction port (46) so that the injection molded part and the upper surface of the ultrasonic oscillation tube (47) are closely fitted, and the ultrasonic oscillation tube (47) is started. The vibration generated by the ultrasonic oscillation tube (47) separates the injection molded part from the center connection, thereby separating multiple groups of ultra-thin parts on the injection molded part, and the injection molded part falls into the interior of the polishing box (4) through the action of gravity and the reciprocating motion of the reciprocating plate (49).

7. The rapid prototyping process for ultra-thin low residual stress injection molded parts according to claim 1, characterized in that: The above-mentioned S6, injection molded part polishing: the vibration of the ultrasonic oscillation tube (47) drives the multiple groups of polishing balls (44) inside the polishing box (4) to vibrate. When the injection molded part falls into the polishing box (4), heat is generated by the vibration friction between the polishing balls (44) and the friction between the polishing balls (44) and the injection molded part, so that the temperature of the injection molded part rises, and the residual stress during injection molding is released, thereby avoiding excessive stress inside the injection molded part to cause fracture. The injection molded part is polished by the friction between the polishing balls (44) and the injection molded part, so that the burrs of the injection molded part are trimmed.

8. The rapid prototyping process for ultra-thin low residual stress injection molded parts according to claim 1, characterized in that: The above-mentioned S7, packaging and warehousing: the injection molded parts gradually move to the right side of the polishing box (4) through vibration friction, and the feeding belt (42) is started. The feeding belt (42) drives the multiple groups of inclined plates (43) on its surface to climb back and forth, thereby carrying the injection molded parts and the polishing balls (44) to climb. The polishing balls (44) fall into the interior of the polishing box (4) through the center of the gap between the two groups of inclined plates (43). Since the volume of the injection molded parts is larger than that of the polishing balls (44), the polishing balls (44) will move to the upper surface of the conveyor belt (41) along with the feeding belt (42) and the inclined plates (43), and be transported by the conveyor belt (41) for subsequent packaging and warehousing.

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