A rapid prototyping process for ultra-thin low residual stress injection molded parts

Abstract

This invention discloses a rapid prototyping process for ultra-thin, low-residual-stress injection molded parts, relating to the field of injection molding machine technology. The invention includes the following steps: accessory installation; heating of plastic granules; injection molding; cooling and demolding; ultrasonic separation; polishing of the injection molded parts; and packaging and warehousing. This invention utilizes the vibration of an ultrasonic oscillating tube to drive multiple sets of polishing balls inside a polishing box to vibrate. When the injection molded part falls into the polishing box, heat is generated through the vibration and friction between the polishing balls and between the polishing balls and the injection molded part, causing the temperature of the injection molded part to rise and releasing the residual stress from the injection molding process. This component effectively avoids the problem of excessive internal stress after the injection molded part is formed, achieving the effect of internal stress release. Simultaneously, it improves the quality of the injection molded part, preventing breakage. It can also be used to polish ultra-thin parts during production, reducing labor costs and polishing time.

Description

Technical Field

[0001] This invention relates to the field of injection molding machine technology, and more specifically to a rapid prototyping process for ultra-thin, low-residual-stress injection molded parts. Background Technology

[0002] Ultra-thin injection molded parts for automobiles are becoming an important trend in the automotive industry, especially against the backdrop of increasing demands for lightweighting and energy conservation. Through advanced injection molding processes, these ultra-thin parts can not only reduce the weight of the entire vehicle but also optimize production costs. Commonly used materials include polypropylene (PP) and polyamide (PA), which can meet the requirements for strength and temperature resistance. Ultra-thin injection molded parts are widely used in automotive exterior parts, dashboards, and other components, which not only enhance the appearance design of the vehicle but also improve manufacturing efficiency, becoming an indispensable part of automobile manufacturing. The stress that ultra-thin injection molded parts bear during the injection molding process is mainly caused by factors such as uneven material flow and differences in cooling rates. Due to the thin walls of ultra-thin injection molded parts, temperature differences often occur during the cooling process, leading to the generation of residual stress, which in turn affects the strength and shape of the parts and may even lead to deformation, cracks, or breakage. Therefore, stress relief is required for ultra-thin injection molded parts.

[0003] The literature (publication number: CN114311482B) discloses the injection molding foaming production equipment and production process for automotive soft touch interior parts. The device starts by activating a flipping motor that drives a flipping shaft. This shaft, in turn, rotates the lower molding die and moves the second drive gear. Simultaneously, the second drive gear drives a second driven gear, which in turn drives a push screw. The push screw then retracts the inner limit rail inside the inner limit plate, releasing the lower molding die from its obstruction and allowing it to flip smoothly. The molded workpiece inside the flipped lower molding die falls onto a guide plate for cushioning and is then conveyed out via a conveyor belt. However, in practical use, this device cannot remove residual stress from the molded parts. Due to the thin walls of the injection molded parts, temperature differences often occur during cooling, leading to residual stress. This can cause the injection molded parts to break during use, failing to improve the quality of the parts. Furthermore, the injection molding process generates burrs and excess plastic, requiring grinding before packaging and warehousing, increasing grinding costs and processing time. Summary of the Invention

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

[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution: A rapid prototyping process for ultrathin, low residual stress injection molded parts includes the following steps; S1. Accessory installation; S2, Heating of plastic granules; S3, Injection molding; S4. Cooling and demolding; S5, ultrasonic separation; S6. Grinding of injection molded parts; S7. Packaging and warehousing.

[0006] Furthermore, regarding the installation of the aforementioned S1 and accessories: First, according to production needs, open the sliding door and pull it inside the outer shell. Install the demolding module onto one side of the fixed plate, install the corresponding male mold onto one end of the adjusting rod, and install the corresponding female mold into the inside of the fixed block, so that one end of the feed pipe fits against the female mold, and the auxiliary rod is inserted into the inside of the female mold to fix the female mold, so that one end of the demolding rod is on the same horizontal plane as the male mold, and the demolding rod slides and inserts into the inside of the male mold. At this time, the male mold and the female mold are on the same horizontal plane.

[0007] Furthermore, in the above-mentioned S2, heating of plastic granules: the heater is installed on the upper surface of the heating platform via the base, and the feeding hopper is installed at the feed port of the heater. When adding plastic granules, the plastic granules are added to the inside of the heater via the feeding hopper. The screw is driven by the servo motor to rotate inside the feed pipe. The heater heats the plastic granules, causing the liquefied plastic to gradually flow downwards along the screw thread and gravity. The air bubbles inside are discharged to the outside of the heater through the feeding hopper. The liquefied plastic is transferred to the inside of the feed pipe through the connecting pipe, thereby heating and liquefying the plastic granules and discharging the air bubbles inside.

[0008] Furthermore, in S3, injection molding: the various components are adjusted via the control panel, and the stepper motor is started to drive the adjusting rod to move horizontally, thereby driving the male mold to move horizontally, so that the male mold fits into the female mold. After closing the sliding door, the hydraulic rod is started to drive the push rod to move horizontally along the inner wall of the feed pipe, thereby pushing the molten plastic 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 molten plastic inside the feed pipe to gradually squeeze into the heating pipe. The heating pipe reheats the molten plastic to prevent the molten plastic from cooling down and solidifying, so that the inner walls of both the female mold and the male mold are filled with molten plastic. The male mold and the female mold form the molten plastic into a specific shape.

[0009] Furthermore, in S4 above, cooling and demolding: after the molten plastic has completely filled the male mold and female mold, cooling water is passed through the cooling pipe to cool the inside of the male mold, causing the molten plastic inside the male mold to solidify and form. The stepper motor drives the adjusting rod and the male mold to return to their original positions. At this time, the injection molded part is attached to the inner wall of the male mold. The electric telescopic rod is activated, and the electric telescopic rod drives the demolding module and demolding rod 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, in S5, ultrasonic separation: after demolding the injection molded part, the injection molded part falls onto the upper surface of the ultrasonic oscillating tube under gravity. Two sets of electric telescopic rods are activated, driving the reciprocating plate to move horizontally along the inner wall of the injection molding table, stretching the spring. When the electric telescopic rods reach their maximum value, they are stopped, and the spring force causes the reciprocating plate to return to its original position, allowing it to reciprocate horizontally on the surface of the unloading plate. The reciprocating plate brings the center of the injection molded part into contact with the ultrasonic oscillating tube. The suction port then adsorbs the injection molded part, ensuring a tight fit between the injection molded part and the upper surface of the ultrasonic oscillating tube. The ultrasonic oscillating tube is then activated, and the vibration generated by the tube separates the injection molded part from the center connection point, thus separating multiple ultra-thin parts from the injection molded part. Through gravity and the reciprocating motion of the reciprocating plate, the injection molded part falls into the interior of the grinding box.

[0011] Furthermore, in the above-mentioned S6, grinding of injection molded parts: the vibration of the ultrasonic oscillating tube drives multiple sets of grinding balls inside the grinding box to vibrate. When the injection molded part falls into the grinding box, heat is generated by the vibration and friction between the grinding balls and the friction between the grinding balls and the injection molded part, causing the temperature of the injection molded part to rise, thereby releasing the residual stress during injection molding and preventing the injection molded part from cracking due to excessive internal stress. The friction between the grinding balls and the injection molded part grinds the injection molded part, thereby trimming the burrs on the injection molded part.

[0012] Furthermore, in S7 above, packaging and warehousing: the injection molded part gradually moves to the right side of the grinding box through vibration and friction, the feeding belt is started, and the feeding belt drives multiple sets of inclined plates on its surface to climb back and forth, thereby carrying the injection molded part and the grinding ball up. The grinding ball falls into the interior of the grinding box through the gap between the two sets of inclined plates. Since the injection molded part is larger than the grinding ball, the grinding ball will move to the upper surface of the conveyor belt along with the feeding belt and inclined plates, and be transferred by the conveyor belt for subsequent packaging and warehousing.

[0013] The beneficial effects of this invention are as follows: 1. This invention uses the vibration of an ultrasonic oscillating tube to drive multiple sets of grinding balls inside a grinding box to vibrate. When the injection molded part falls into the grinding box, heat is generated through the vibration and friction between the grinding balls and the friction between the grinding balls and the injection molded part, causing the temperature of the injection molded part to rise and releasing the residual stress during injection. The friction between the grinding balls and the injection molded part polishes the part, thereby trimming the burrs. This component effectively avoids the problem of excessive internal stress after the injection molded part is formed, achieving the effect of releasing internal stress. At the same time, it improves the quality of the injection molded part, prevents the injection molded part from breaking, and can also polish ultra-thin parts during production, reducing the corresponding labor costs and grinding time.

[0014] 2. After the injection molded part is demolded, it falls onto the upper surface of the ultrasonic oscillating tube under gravity. Two sets of electric telescopic rods are activated, causing the reciprocating plate to move horizontally along the inner wall of the injection molding table, stretching the spring. When the electric telescopic rods reach their maximum value, they are stopped, and the spring force returns the reciprocating plate to its original position. This allows the reciprocating plate to reciprocate horizontally on the surface of the unloading plate, bringing the center of the injection molded part into contact with the ultrasonic oscillating tube. The suction port then adsorbs the injection molded part, ensuring it is flush with the upper surface of the ultrasonic oscillating tube. With the surfaces tightly bonded, the ultrasonic oscillating tube is activated. The vibration generated by the ultrasonic oscillating tube separates the injection molded part from the central connection, thereby separating multiple ultra-thin parts on the injection molded part. Through gravity and the reciprocating motion of the reciprocating plate, the injection molded part falls into the interior of the grinding box. This component effectively avoids the problem of manually separating the injection molded part from the connection after molding, achieving the effect of automatic separation through ultrasonic oscillation. At the same time, it reduces the corresponding processing time, improves separation efficiency, and avoids damage to the injection molded part caused by manual separation during actual use.

[0015] 3. This invention mounts the heating machine onto the upper surface of the heating platform via a base, and installs the feeding hopper at the inlet of the heating machine. When adding plastic granules, the granules are added to the inside of the heating machine through the feeding hopper. A servo motor drives the screw to rotate inside the feeding pipe. The heating machine heats the plastic granules, causing the liquefied plastic to gradually flow downwards along the screw thread and under gravity. Air bubbles inside the granules are discharged to the outside of the heating machine through the feeding hopper. The liquefied plastic is then transferred to the inside of the feeding pipe through a connecting pipe, thereby heating and liquefying the plastic granules and expelling the air bubbles. This component effectively avoids the problem of air bubbles in the liquid plastic during injection molding, achieving automatic air bubble removal. At the same time, it improves the quality of the injection molded parts, prevents air bubbles from affecting the molding process, and increases the yield of injection molded parts in actual use. It also facilitates the widespread adoption of this injection molding machine. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is the present invention. Figure 1 Rear view structural diagram; Figure 3 This is the present invention. Figure 1 A schematic diagram of the internal structure is shown from the front. Figure 4 This is the present invention. Figure 3 Rear view sectional structural schematic diagram; Figure 5 This is the present invention. Figure 1 Top view of the partial structure; Figure 6 This is the present invention. Figure 5 A schematic diagram of the partial structure on the left.

[0017] Reference 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. Fixing block; 2. Injection table; 21. Cooling tube; 22. Outer shell; 23. Stepper motor; 24. Adjusting rod; 25. Fixing plate; 26. Demolding module; 27. Demolding rod; 28. Electric telescopic rod one; 3. Feeding pipe; 31. Connecting pipe; 32. Conveying 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. Air intake; 47. Ultrasonic oscillation tube; 48. Electric telescopic rod two; 49. Reciprocating plate; 410. Unloading plate. Detailed Implementation

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

[0019] Example 1, as Figures 1-6 As shown, a rapid prototyping process for ultra-thin, low residual stress injection molded parts includes the following steps; S1. Accessory installation; S2, Heating of plastic granules; S3, Injection molding; S4. Cooling and demolding; S5, ultrasonic separation; S6. Grinding of injection molded parts; S7. Packaging and warehousing.

[0020] Example 2, as Figure 1 , Figure 5 As shown, based on the above embodiment, it also includes the above-mentioned S1, accessory installation: First, according to production needs, open the sliding door 17 and pull the sliding door 17 into the housing 22. Install the demolding module 26 onto one side of the fixing plate 25, install the corresponding male mold 18 onto one end of the adjusting rod 24, and install the corresponding female mold 19 into the inside of the fixing 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. One end of the demolding rod 27 is at the same level as the male mold 18, so that the demolding rod 27 slides and inserts into the inside of the male mold 18. At this time, the male mold 18 and the female mold 19 are at the same level, which can achieve the effect of quick mold replacement and installation. At the same time, after the installation is completed, the sliding door 17 can close the injection area to avoid the high temperature of the plastic during injection molding from causing harm to the workers, and also improve the safety of the device.

[0021] Example 3, as Figure 1 , Figure 4 As shown, based on the above embodiment, it also includes the above-mentioned S2, plastic particle heating: the heater 12 is installed on the upper surface of the heating table 1 via the base 11, and the feeding hopper 13 is installed at the inlet of the heater 12. When adding plastic particles, the plastic particles are added to the inside of the heater 12 via the feeding hopper 13. The screw 36 is driven by the servo motor 34 to rotate inside the conveying pipe 32. The heater 12 heats the plastic particles, so that the liquefied plastic gradually flows downward with the screw 36 thread and gravity. The air bubbles inside are discharged to the outside of the heater 12 through the feeding hopper 13. The liquefied plastic is transferred to the inside of the feed pipe 3 via the connecting pipe 31, thereby heating and liquefying the plastic particles and discharging the air bubbles inside, thus avoiding the impact of air 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, based on the above embodiment, it also includes the above-mentioned S3, injection molding: the various components are adjusted by the control panel 16, the stepper motor 23 is started to drive the adjusting rod 24 to move horizontally, and then drive the male mold 18 to move horizontally, so that the male mold 18 fits with the female mold 19. 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 feed 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 goes deeper, the pressure inside the feed pipe 3 increases, thereby pushing the plastic liquid inside the feed pipe 3 to gradually squeeze into the heating pipe 14. The heating pipe 14 reheats the plastic liquid to prevent the plastic liquid from cooling down and solidifying, so that the inner walls of the female mold 19 and the male mold 18 are filled with plastic liquid. The male mold 18 and the female mold 19 make the plastic liquid form a specific shape. Through the cooperation of the two sets of corresponding molds, the liquid plastic can be molded into the required parts, which meets the production needs of complex parts and improves the functionality of the device.

[0023] Example 5, such as Figure 1 , Figure 5 As shown, based on the above embodiment, it also includes S4, cooling and demolding: After the molten plastic is completely filled into the male mold 18 and the female mold 19, cooling water is passed through the cooling pipe 21 to cool the inside of the male mold 18, so that the molten plastic inside the male mold 18 solidifies and forms a mold. The stepper motor 23 drives the adjusting rod 24 and the male mold 18 to return to their original positions. At this time, the injection molded part is attached to the inner wall of the male mold 18. The electric telescopic rod 28 is activated, and the demolding module 26 and the demolding rod 27 are moved horizontally through the electric telescopic rod 28, 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 demolding rod 27 automatically demolds the molded injection molded part, which improves the injection molding efficiency, avoids damage to the injection molded part caused by manual demolding, and also avoids the harm to the workers caused by high temperature, thus improving the practicality and safety of the device.

[0024] Example 6, as Figure 6As shown, based on the above embodiment, it also includes S5, ultrasonic separation: After the injection molded part is demolded, the injection molded part falls onto the upper surface of the ultrasonic oscillation tube 47 by gravity. Two sets of electric telescopic rods 48 are activated, driving the reciprocating plate 49 to move horizontally along the inner wall of the injection molding table 2, causing the spring 45 to stretch. When the electric telescopic rods 48 reach their maximum value, they are stopped. The spring force of the spring 45 causes the reciprocating plate 49 to return to its original position, allowing the reciprocating plate 49 to reciprocate horizontally on the surface of the unloading plate 410. The reciprocating plate 49 ensures that the center of the injection molded part is in contact with the ultrasonic oscillation tube. The ultrasonic oscillating tube 47 is attached, and the injection molded part is adsorbed through the suction port 46, so that the injection molded part is tightly attached to the upper surface of the ultrasonic oscillating tube 47. The ultrasonic oscillating tube 47 is activated, and the vibration generated by the ultrasonic oscillating tube 47 separates the injection molded part from the central connection, thereby separating multiple sets of ultra-thin parts on the injection molded part. Through gravity and the reciprocating motion of the reciprocating plate 49, the injection molded part falls into the interior of the grinding box 4. This achieves the effect of automatically separating the parts from the connection through ultrasonic oscillation, while reducing the corresponding processing time, improving the separation efficiency, and avoiding damage to the injection molded part caused by manual separation during actual use.

[0025] Example 7, as Figure 6 As shown, based on the above embodiment, it also includes S6, grinding of the injection molded part: the vibration of the ultrasonic oscillating tube 47 drives multiple sets of grinding balls 44 inside the grinding box 4 to vibrate. When the injection molded part falls into the interior of the grinding box 4, heat is generated by the vibration friction between the grinding balls 44 and the friction between the grinding balls 44 and the injection molded part, causing the temperature of the injection molded part to rise, thereby releasing the residual stress during injection molding, thus avoiding excessive internal stress and breakage of the injection molded part. The friction between the grinding balls 44 and the injection molded part grinds 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, it improves the quality of the injection molded part and avoids the injection molded part from breaking. It can also be used to grind ultra-thin parts during the production of ultra-thin parts, reducing the corresponding labor costs and grinding time.

[0026] Example 8, as Figure 6As shown, based on the above embodiment, it also includes the above-mentioned S7, packaging and warehousing: the injection molded part gradually moves to the right side of the grinding box 4 through vibration and friction, the feeding belt 42 is started, and the feeding belt 42 drives the multiple sets of inclined plates 43 on its surface to climb back and forth, thereby carrying the injection molded part and the grinding ball 44 to climb. The grinding ball 44 falls into the interior of the grinding box 4 through the center of the gap between the two sets of inclined plates 43. Since the injection molded part is larger than the grinding ball 44, the grinding ball 44 will move to the upper surface of the conveyor belt 41 along with the feeding belt 42 and the inclined plates 43. It is then transported by the conveyor belt 41 for subsequent packaging and warehousing. This can achieve the effect of automatically collecting the injection molded parts that have undergone grinding and heat treatment, improve the corresponding collection efficiency, and also achieve the effect of automatically feeding finished parts without manual intervention.

[0027] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those 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 invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded 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, Includes the following steps; S1. Accessory installation; S2, Heating of plastic granules; S3, Injection molding; S4. Cooling and demolding; S5. Ultrasonic Separation: After demolding the injection molded part, the injection molded part falls onto the upper surface of the ultrasonic oscillating tube (47) under gravity. The two sets of electric telescopic rods (48) are activated. The electric telescopic rods (48) drive the reciprocating plate (49) to move horizontally along the inner wall of the injection table (2), causing the spring (45) to stretch. When the electric telescopic rods (48) reach their maximum value, the electric telescopic rods (48) are stopped. The spring force of the spring (45) causes the reciprocating plate (49) to return to its original position, so that the reciprocating plate (49) is on the unloading plate (410). The surface of the injection molded part moves horizontally back and forth. The reciprocating plate (49) makes the center of the injection molded part fit with the ultrasonic oscillating tube (47). The injection molded part is adsorbed through the air inlet (46), so that the injection molded part is tightly fitted with the upper surface of the ultrasonic oscillating tube (47). The ultrasonic oscillating tube (47) is started. The vibration generated by the ultrasonic oscillating tube (47) separates the injection molded part from the center connection, thereby separating multiple sets of ultra-thin parts on the injection molded part. Through gravity and the reciprocating motion of the reciprocating plate (49), the injection molded part falls into the interior of the grinding box (4). S6. Grinding of injection molded parts: The vibration of the ultrasonic oscillating tube (47) drives multiple sets of grinding balls (44) inside the grinding box (4) to vibrate. When the injection molded part falls into the grinding box (4), heat is generated by the vibration friction between the grinding balls (44) and the friction between the grinding balls (44) and the injection molded part, which causes the temperature of the injection molded part to rise, thereby releasing the residual stress during injection molding and preventing the injection molded part from breaking due to excessive internal stress. The grinding balls (44) and the injection molded part are used to grind the injection molded part, thereby trimming the burrs of the injection molded part. S7. Packaging and Warehousing: The injection molded part gradually moves to the right side of the grinding box (4) through vibration and friction. The feeding belt (42) is started. The feeding belt (42) drives the multiple sets of inclined plates (43) on its surface to climb back and forth, thereby carrying the injection molded part and the grinding ball (44) to climb. The grinding ball (44) falls into the interior of the grinding box (4) through the gap between the two sets of inclined plates (43). Since the injection molded part is larger than the grinding ball (44), the injection molded part will move to the upper surface of the conveyor belt (41) along with the feeding belt (42) and the inclined plate (43). It is then transported by the conveyor belt (41) for subsequent packaging and warehousing.

2. The rapid prototyping process for ultra-thin, low residual stress injection molded parts according to claim 1, characterized in that, S1 above, accessory 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 fixing plate (25), install the corresponding male mold (18) into one end of the adjusting rod (24), install the corresponding female mold (19) into the inside of the fixing block (110), so that one end of the feed pipe (3) is in contact with the female mold (19), so that 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 demolding rod (27) is on the same horizontal plane as the male mold (18), so that the demolding rod (27) slides and inserts into the inside of the male mold (18), at this time the male mold (18) and the female mold (19) are on 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, S2, heating of plastic granules: The heating machine (12) is installed on the upper surface of the heating platform (1) through the base (11), and the feeding hopper (13) is installed at the inlet of the heating machine (12). When adding plastic granules, the plastic granules are added to the inside of the heating machine (12) through the feeding hopper (13). The screw (36) is driven to rotate inside the conveying pipe (32) by the servo motor (34). The plastic granules are heated by the heating machine (12), so that the liquefied plastic gradually flows downward with the screw (36) and gravity. The bubbles inside are discharged to the outside of the heating machine (12) through the feeding hopper (13). The liquefied plastic is transferred to the inside of the feed pipe (3) through the connecting pipe (31), thereby heating and liquefying the plastic granules and discharging the bubbles inside.

4. The rapid prototyping process for ultra-thin, low residual stress injection molded parts according to claim 1, characterized in that, S3 above, injection molding: The components are adjusted by the control panel (16), the stepper motor (23) is started to drive the adjustment rod (24) to move horizontally, and then drive the male mold (18) to move horizontally, so that the male mold (18) and the female mold (19) fit together. 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 feed pipe (3), 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 pressure inside the feed pipe (3) increases, thereby pushing the plastic liquid inside the feed pipe (3) to gradually squeeze into the heating pipe (14). The plastic liquid is reheated by the heating pipe (14) to avoid the plastic liquid from cooling down and solidifying, so that the inner walls of the female mold (19) and the male mold (18) are filled with plastic liquid. The plastic liquid is formed into a specific shape by 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, S4 above, cooling and demolding: After the plastic liquid is completely filled into the male mold (18) and female mold (19), cooling water is passed through the cooling pipe (21) to cool the male mold (18) so that the plastic liquid inside the male mold (18) solidifies and forms a shape. The stepper motor (23) drives the adjusting rod (24) and the male mold (18) to return to their original positions. At this time, the injection molded part is attached to the inner wall of the male mold (18). The electric telescopic rod one (28) is started. The electric telescopic rod one (28) drives the demolding module (26) and 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.

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