Injection mold for reducing residual stress of thin-wall part

Abstract

The invention discloses an injection mold for reducing residual stress of a thin-walled workpiece, and relates to the technical field of thin-walled workpiece machining, the injection mold comprises a mold frame, a cooling system and a heating system, the mold frame comprises an upper mold frame and a lower mold frame, the upper mold frame and the lower mold frame are correspondingly arranged up and down, and mold cores are embedded in the upper mold frame and the lower mold frame; the cooling system comprises a cooling mechanism, the heating system comprises a heating rod, an ejection mechanism is arranged in the lower mold frame and the mold core, and auxiliary mechanisms are symmetrically arranged on the outer walls of the left side and the right side of the mold frame. Through the synergistic effect of a cooling system and a heating system in the mold, uniform cooling in a mold cavity and good fluidity of a melt are achieved, the residual stress of a thin-wall part is effectively reduced, heat generated by spiral arrangement of a cooling water channel and a heating wire in a heating rod is rapidly transmitted to a mold core through a graphene layer, and the heat dissipation efficiency is improved. And the melt can flow to the corners of the mold cavity more quickly, so that the buckling deformation of an injection molding part is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of thin-walled parts processing, in particular to an injection mold for reducing the residual stress of thin-walled parts. Background Art

[0002] Injection molding is a manufacturing process widely used in industrial production. Especially when producing thin-walled parts, residual stress is easily generated due to uneven material cooling speed, leading to product deformation, cracking and other problems. These problems not only affect the appearance quality of the product, but may also affect its functional performance. At present, the industry is actively studying the reduction of residual stress in thin-walled parts, and has proposed a variety of solutions, but there are still certain limitations.

[0003] Existing methods for reducing residual stress in thin-walled parts mainly include cooling water channel design optimization, injection pressure control and material modification. Although cooling water channel design optimization can improve cooling efficiency, it is difficult to accurately control the cooling rate, especially in thin-walled parts with complex shapes. Injection pressure control can effectively improve the filling effect, but it has high requirements on equipment precision and limited scope of application. Although material modification can improve material performance, it is costly and requires a lot of experimental verification. Therefore, the present invention proposes an injection mold for reducing residual stress in thin-walled parts. Summary of the invention

[0004] The purpose of the present invention is to provide an injection mold for reducing the residual stress of thin-walled parts, so as to solve the existing methods for reducing the residual stress of thin-walled parts proposed in the above background technology, which mainly include cooling water channel design optimization, injection pressure control and material modification. Although cooling water channel design optimization can improve cooling efficiency, it is difficult to accurately control the cooling rate, especially in thin-walled parts with complex shapes, the effect is limited. Injection pressure control can effectively improve the filling effect, but it has high requirements on equipment precision and limited scope of application. Although material modification can improve material performance, it is costly and requires a lot of experimental verification.

[0005] In order to achieve the above object, the present invention provides the following technical solutions: An injection mold for reducing residual stress of thin-walled parts comprises a mold frame, a cooling system and a heating system, wherein the mold frame comprises an upper mold frame and a lower mold frame, the upper mold frame and the lower mold frame are arranged correspondingly up and down, mold cores are embedded in the upper mold frame and the lower mold frame, the cooling system comprises a cooling mechanism, the heating system comprises a heating rod, ejection mechanisms are arranged inside the lower mold frame and the mold core, and auxiliary mechanisms are symmetrically arranged on the outer walls on the left and right sides of the mold frame.

[0006] Optionally, an injection nozzle is provided on the upper surface of the upper mold frame, a mold cavity is provided on the bottom surface of the upper mold frame, the mold cavity is located below the injection nozzle and is connected to the injection nozzle, and positioning holes are provided at the four corners of the bottom surface of the upper mold frame.

[0007] Optionally, the lower mold frame is provided with an insert in the upper middle part of the mold core, the outer sleeve of the insert is provided with a molding sleeve, and the upper surface of the lower mold frame relative to the mold core is evenly distributed with positioning rods matching the positioning holes, the molding sleeve corresponds to the position of the mold cavity, and the molding sleeve and the mold cavity are clearance-matched.

[0008] Optionally, the heating rod is symmetrically arranged on the front and rear sides of the upper mold frame, and the heating rod includes a mounting sleeve, a heating tube, a heating wire and a screw. The mounting sleeve is connected to the upper mold frame and is correspondingly arranged on the front and rear side walls of the upper mold frame. The screws are distributed on the mounting sleeve at equal intervals around the circumference. The heating tube is fixedly connected to the side of the mounting sleeve. The heating tube is inserted into the heating hole opened in the mold core at the upper end, and a heating wire is arranged in the heating tube.

[0009] Optionally, the heating rod further includes a water storage layer and a graphene layer, the water storage layer is arranged on the inner layer of the heating tube, and the graphene layer is arranged on the outer layer of the heating tube.

[0010] Optionally, the cooling mechanism includes a cooling water channel, a cooling water inlet, a cooling water inlet hole, a cooling water outlet hole and a cooling water outlet. The cooling water channel is spirally arranged on the outer peripheral wall of the insert, and the left and right side walls of the lower mold frame are symmetrically provided with a cooling water inlet and a cooling water outlet. The cooling water channel is provided with a cooling water outlet hole at the upper end surface of the insert, and the cooling water channel is provided with a cooling water inlet hole at the lower end surface of the insert. The cooling water inlet is connected with the cooling water outlet hole, and the cooling water outlet is connected with the cooling water inlet hole.

[0011] Optionally, the cooling water outlet hole flows the cooling water to the cooling water inlet hole through a spiral cooling water channel.

[0012] Optionally, the ejection mechanism includes a first active cavity, a spring rod, a top plate, an abutment block, a second active cavity, a slide rail, a return spring and a wedge block, the first active cavity is opened at the inner center of the insert, a spring rod is inserted into the first active cavity, the upper end of the spring rod is fixedly connected to the top plate, the lower end of the spring rod is fixedly connected to the abutment block, a second active cavity communicating with the first active cavity is opened below the abutment block, a slide rail is provided on the side wall of the second active cavity, and a return spring is provided at the bottom of the second active cavity, the end of the return spring is fixedly connected to the wedge block, the wedge block is slidably connected to the slide rail, and a side surface of the wedge block close to the abutment block is inclined.

[0013] Optionally, the top plate is matched with the door opening surface at the upper end of the insert, and the top plate is located above the upper end of the insert before the mold is closed.

[0014] Optionally, the auxiliary mechanism includes a mounting plate, a fixing sleeve, a cylinder, a fixing seat and a guide rod, the mounting plate is arranged on the bottom side wall of the lower mold frame, the cylinder is fixedly installed on the side wall of the lower mold frame through the fixing sleeve, the output end of the cylinder is fixedly connected to the fixing seat provided on the side wall of the upper mold frame, the mounting plate is symmetrically provided with guide rods on both sides of the cylinder, and the upper mold frame sliding sleeve is arranged on the outside of the guide rods.

[0015] The beneficial effects of the present invention are: 1. The present invention realizes uniform cooling in the mold cavity and good fluidity of the melt through the synergistic effect of the cooling system and the heating system inside the mold, effectively reducing the residual stress of thin-walled parts. The heat generated by the spiral arrangement of the cooling water channel and the heating wire in the heating rod is quickly transferred to the mold core through the graphene layer, so that the melt can flow to the corner of the mold cavity faster, reducing the warping deformation of the injection molded parts, ensuring the temperature stability and cooling efficiency during the injection molding process, thereby improving production efficiency.

[0016] 2. In the present invention, the mold core is made of high thermal conductivity material and the mold frame is made of high-strength alloy steel, which ensures the stability and durability of the mold and extends the service life of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an injection mold for reducing residual stress of thin-walled parts according to the present invention; Figure 2 It is a schematic diagram of the structure after the upper and lower mold frames of the present invention are molded together; Figure 3 It is a structural schematic diagram of another perspective of an injection mold for reducing residual stress of thin-walled parts according to the present invention; Figure 4 It is a front view of the present invention before mold closing; Figure 5 is a cross-sectional view of the upper mold frame in the present invention; Figure 6 It is a structural schematic diagram of the electric heating rod in the present invention; Figure 7 It is a schematic diagram of the partial decomposition structure of the lower mold core in the present invention; Figure 8 It is a structural schematic diagram of the ejection mechanism in the present invention.

[0018] The numbers in the figure are: 1. Mold frame; 101. upper mold frame; 1011. injection nozzle; 1012. mold cavity; 1013. positioning hole; 102. lower mold frame; 1021. molding sleeve; 1022. insert; 1023. positioning rod; 103. mold core; 2. Heating rod; 201. Mounting sleeve; 202. Heating tube; 203. Heating wire; 204. Water storage layer; 205. Graphene layer; 206. Screw; 3. Ejection mechanism; 301. First movable cavity; 302. Spring rod; 303. Top plate; 304. Abutment block; 305. Second movable cavity; 306. Slide rail; 307. Return spring; 308. Wedge block; 4. Cooling mechanism; 401. Cooling water channel; 402. Cooling water inlet; 403. Cooling water inlet hole; 404. Cooling water outlet hole; 405. Cooling water outlet; 5. Auxiliary mechanism; 501. Mounting plate; 502. Fixing sleeve; 503. Cylinder; 504. Fixing seat; 505. Guide rod. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0020] The device of the present invention will be described below in conjunction with preferred embodiments thereof.

[0021] See also Figure 1-8 As shown, the injection mold for reducing the residual stress of thin-walled parts includes a mold frame 1, a cooling system and a heating system. The mold frame 1 includes an upper mold frame 101 and a lower mold frame 102. The upper mold frame 101 and the lower mold frame 102 are arranged correspondingly up and down. The upper mold frame 101 and the lower mold frame 102 are both embedded with mold cores 103. The cooling system includes a cooling mechanism 4. The cooling mechanism 4 is used to quickly cool the melt in the mold cavity 1012 to reduce the generation of residual stress. The heating system includes a heating rod 2. The heating rod 2 controls the temperature of the mold core 103 to ensure good fluidity of the melt in the mold cavity 1012. The lower mold frame 102 and the mold core 103 are provided with an ejection mechanism 3. The ejection mechanism 3 is used to After the injection molding is completed, the product is ejected from the mold cavity 1012. Auxiliary mechanisms 5 are symmetrically arranged on the outer walls of the left and right sides of the mold frame 1. The auxiliary mechanism 5 is used to assist in the opening and closing, positioning of the mold and the removal of the product. Specifically, the mold is closed by the auxiliary mechanism 5, and then the melt is injected into the mold cavity 1012 through the injection nozzle 1011. The heating rod 2 is used to ensure good fluidity of the melt in the mold cavity 1012. After the melt flows into the molding sleeve 1021, it is cooled and solidified into a product in the mold cavity 1012 through the cooling mechanism 4, thereby reducing the residual stress of the thin-walled parts. After the finished product is injection molded, the mold is opened and closed by the auxiliary mechanism 5, and the product is ejected from the mold cavity 1012 by the ejection mechanism 3.

[0022] Furthermore, an injection nozzle 1011 is provided on the upper surface of the upper mold frame 101, and a mold cavity 1012 is provided on the bottom surface of the upper mold frame 101. The mold cavity 1012 is located below the injection nozzle 1011 and is connected to the injection nozzle 1011. Positioning holes 1013 are provided at the four corners of the bottom surface of the upper mold frame 101.

[0023] Furthermore, the lower mold frame 102 is provided with an insert 1022 in the upper middle part of the mold core 103, and the outer sleeve of the insert 1022 is provided with a molding sleeve 1021. The upper surface of the lower mold frame 102 relative to the mold core 103 is evenly distributed with positioning rods 1023 that match the positioning holes 1013. The mold is positioned after mold closing by the cooperation of the positioning rods 1023 and the positioning holes 1013. The molding sleeve 1021 corresponds to the position of the mold cavity 1012, and the molding sleeve 1021 and the mold cavity 1012 are clearance-matched.

[0024] Among them, the mold frame 1 is made of high-strength alloy steel, which has good rigidity and corrosion resistance, ensuring the stability and durability of the mold. The mold core 103 is made of copper alloy, which has high thermal conductivity and good processing performance. The cooling water channel 401 adopts a stainless steel pipe with a diameter of 5mm, which is resistant to high temperature and corrosion. The heating rod 2 adopts a nickel-chromium alloy heating rod with a diameter of 3mm, which is resistant to high temperature and has good conductivity.

[0025] In another embodiment provided by the present invention, Figure 4-6 As shown, the heating rod 2 is symmetrically arranged on the front and rear sides of the upper mold frame 101, and the heating rod 2 includes a mounting sleeve 201, a heating tube 202, a heating wire 203 and a screw 206. The mounting sleeve 201 is connected to the upper mold frame 101 and is correspondingly arranged on the front and rear side walls of the upper mold frame 101. The screws 206 are distributed on the mounting sleeve 201 at equal intervals around the circumference. The heating tube 202 is fixedly connected to the side of the mounting sleeve 201. The heating tube 202 is inserted into the heating hole opened in the upper mold core 103, and a heating wire 203 is arranged in the heating tube 202.

[0026] Specifically, the heating rod 2 is controlled by electrical connection, and a heating wire 203 is arranged in the heating rod 2 so that the heating wire 203 works to generate heat, and the generated heat is transferred to the mold frame through heat transfer. The multiple heating rods 2 are provided so that the heat can better cover the injection mold through heat transfer. When the molten material flows to the corners in the mold cavity 1012, the heating rod 2 can keep the molten material entering the mold at a stable temperature and fluidity, so that the molten material can flow to the mold cavity 1012 faster, reducing the warping deformation of the injection molded parts. At the same time, the molten material can flow to the small corners in the mold cavity 1012, making the corners of the injection molded parts fuller, thereby ensuring the filling efficiency of the injection mold and the quality of the injection molded parts.

[0027] Furthermore, the heating rod 2 also includes a water storage layer 204 and a graphene layer 205 . The water storage layer 204 is arranged on the inner layer of the heating tube 202 , and the graphene layer 205 is arranged on the outer layer of the heating tube 202 .

[0028] Specifically, water has a good heat storage performance. When the heating rod 2 generates heat, the water stores the heat and transfers the heat to the heating tube 202, so that the heating rod 2 can work intermittently to ensure the heating temperature of the heating tube 202, thereby reducing the energy loss caused by the heating process. In addition, graphene has good thermal conductivity, so that the heat generated by the heating wire 203 can be transferred to the injection mold more quickly, thereby reducing the heating time required for the injection mold.

[0029] In another embodiment provided by the present invention, Figure 7 and 8 As shown, the cooling mechanism 4 includes a cooling water channel 401, a cooling water inlet 402, a cooling water inlet hole 403, a cooling water outlet hole 404 and a cooling water outlet 405. The cooling water channel 401 is spirally arranged on the outer peripheral wall of the insert 1022. The left and right side walls of the lower mold frame 102 are symmetrically provided with a cooling water inlet 402 and a cooling water outlet 405. The cooling water channel 401 is provided with a cooling water outlet hole 404 at the upper end surface of the insert 1022. The cooling water channel 401 is provided with a cooling water inlet hole 403 at the lower end surface of the insert 1022. The cooling water inlet 402 is connected with the cooling water outlet hole 404, and the cooling water outlet 405 is connected with the cooling water inlet hole 403. The cooling water outlet hole 404 circulates cooling water to the cooling water inlet hole 403 through the spiral cooling water channel 401.

[0030] Specifically, the cooling water flows through the cooling water inlet 402, the cooling water outlet 404, the cooling water channel 401, the cooling water inlet 403 and the cooling water outlet 405 in sequence. By providing a spiral cooling water channel 401 on the outer peripheral wall of the insert 1022, when the cooling water flows through the cooling water channel 401, the cooling water can take away the heat in the molding sleeve 1021, that is, the molding sleeve 1021 can be prevented from overheating, thereby preventing the formed thin-walled parts from sticking to the molding sleeve 1021, thereby ensuring the normal demolding of the thin-walled parts.

[0031] In another embodiment provided by the present invention, Figure 2 and 8As shown, the ejection mechanism 3 includes a first movable cavity 301, a spring rod 302, a top plate 303, an abutment block 304, a second movable cavity 305, a slide rail 306, a return spring 307 and a wedge block 308. The first movable cavity 301 is opened at the inner center of the insert 1022. The spring rod 302 is inserted into the first movable cavity 301. The upper end of the spring rod 302 is fixedly connected to the top plate 303. The lower end of the spring rod 302 is fixedly connected to the abutment block 304. A second movable cavity 305 communicating with the first movable cavity 301 is opened below the abutment block 304. The side wall of the second movable cavity 305 is provided with a slide rail 306, and the bottom of the second movable cavity 305 is provided with a return spring 307. The end of the return spring 307 is fixedly connected to the wedge block 308. The wedge block 308 is slidably connected to the slide rail 306, and the side surface of the wedge block 308 close to the abutment block 304 is an inclined surface.

[0032] Furthermore, the top plate 303 and the open surface of the upper end of the insert 1022 are adapted to each other, and the top plate 303 is located above the upper end of the insert 1022 before the mold is closed.

[0033] Furthermore, the auxiliary mechanism 5 includes a mounting plate 501, a fixing sleeve 502, a cylinder 503, a fixing seat 504 and a guide rod 505. The mounting plate 501 is arranged on the bottom side wall of the lower mold frame 102. The cylinder 503 is fixedly installed on the side wall of the lower mold frame 102 through the fixing sleeve 502. The output end of the cylinder 503 is fixedly connected to the fixing seat 504 provided on the side wall of the upper mold frame 101. The mounting plate 501 is symmetrically provided with guide rods 505 on both sides of the cylinder 503, and the upper mold frame 101 is slidably sleeved on the outside of the guide rods 505.

[0034] Specifically, by starting the cylinder 503, it is ensured that the upper mold frame 101 can move downward smoothly, and the two groups of cylinders 503 are used to drive the upper mold frame 101 to gradually move downward to the molding sleeve 1021. During the downward movement, the guide rod 505 plays a role in guiding the upper mold frame 101 to ensure the stability of the descent of the upper mold frame 101, and then the mold is positioned after the mold is closed through the cooperation of the positioning rod 1023 and the positioning hole 1013 to ensure the stability of the upper mold frame 101 and the lower mold frame 102 after the mold is closed. When the upper mold frame 101 is lowered, the inner wall of the mold cavity 1012 will contact the upper surface of the top plate 303, and the top plate 303 will be driven to move downward along the first active cavity 301. As the top plate 303 moves downward, the spring rod 302 and the abutment block 304 are simultaneously driven downward. During this process, the spring sleeved on the outside of the vertical rod in the spring rod 302 is in a stretched state, and as the abutment block 304 moves downward, it will prompt The lower end of the wedge block 308 is in contact with the inclined surface of the wedge block 308, thereby causing the wedge block 308 to compress the return spring 307 and slide to the left along the bottom surface of the second active cavity 305. Finally, the top plate 303 is fully matched with the upper end surface of the insert 1022. When the injection molding is completed, after the melt is completely cooled in the gap between the molding sleeve 1021 and the mold cavity 1012, the upper mold frame 101 is driven to move upward by controlling the cylinder 503. As the upper mold frame 101 moves upward, the top plate 303 no longer conflicts with the inner wall of the mold cavity 1012. As a result, under the combined action of the rebound force of the spring on the outer sleeve of the vertical rod in the spring rod 302 and the rebound force of the return spring 307 at the bottom of the second active cavity 305, the top plate 303, the spring rod 302, and the abutment block 304 are forced to move up and reset. As the top plate 303 moves upward, it will push the mold away from the outside of the molding sleeve 1021, thereby completing automatic demolding.

[0035] When in use, the cylinder 503 in the auxiliary mechanism 5 is started to push the upper mold frame 101 to move downward smoothly. At the same time, the guide rod 505 ensures the stability of the descent of the upper mold frame 101. The upper mold frame 101 and the lower mold frame 102 are accurately positioned through the cooperation of the positioning rod 1023 and the positioning hole 1013. The melt is injected into the mold cavity 1012 through the injection nozzle 1011. The heating rod 2 generates heat through the heating wire 203 to ensure that the melt maintains good fluidity in the mold cavity 1012. The heat generated by the heating wire 203 in the heating rod 2 is quickly transferred to the mold core 103 through the graphene layer 205, so that the melt can flow to the corner of the mold cavity 1012 faster, reducing the warping deformation of the injection molded part, and the cooling machine The cooling water in the structure 4 flows in a spiral on the outer peripheral wall of the insert 1022 through the cooling water channel 401, taking away the heat in the molding sleeve 1021, avoiding overheating of the molding sleeve 1021, and ensuring normal demolding of the thin-walled parts. When the melt is cooled and solidified in the mold cavity 1012, the upper mold frame 101 is driven to move upward by controlling the cylinder 503. After the upper mold frame 101 moves up, the top plate 303 no longer conflicts with the inner wall of the mold cavity 1012. Under the rebound force of the spring rod 302 and the return spring 307, the top plate 303 moves up to eject the molded product from the molding sleeve 1021, thereby effectively reducing the residual stress of the thin-walled parts, reducing the risk of product deformation and cracking, and improving product quality.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. An injection mold for reducing residual stress of thin-walled parts, characterized in that: The invention comprises a mold frame (1), a cooling system and a heating system, wherein the mold frame (1) comprises an upper mold frame (101) and a lower mold frame (102), wherein the upper mold frame (101) and the lower mold frame (102) are arranged correspondingly up and down, and mold cores (103) are embedded in the upper mold frame (101) and the lower mold frame (102), wherein the cooling system comprises a cooling mechanism (4), and the heating system comprises a heating rod (2), wherein the lower mold frame (102) and the mold core (103) are provided with ejection mechanisms (3), and auxiliary mechanisms (5) are symmetrically provided on the outer walls on the left and right sides of the mold frame (1).

2. The injection mold for reducing residual stress of thin-walled parts according to claim 1, characterized in that: An injection nozzle (1011) is provided on the upper surface of the upper mold frame (101), a mold cavity (1012) is provided on the bottom surface of the upper mold frame (101), the mold cavity (1012) is located below the injection nozzle (1011) and is connected to the injection nozzle (1011), and positioning holes (1013) are provided at the four corners of the bottom surface of the upper mold frame (101).

3. The injection mold for reducing residual stress of thin-walled parts according to claim 1, characterized in that: The lower mold frame (102) is provided with an insert (1022) in the middle part above the mold core (103); the outer sleeve of the insert (1022) is provided with a molding sleeve (1021); positioning rods (1023) matching with positioning holes (1013) are evenly distributed on the upper surface of the lower mold frame (102) relative to the mold core (103); the molding sleeve (1021) corresponds to the position of the mold cavity (1012), and the molding sleeve (1021) and the mold cavity (1012) are clearance-matched.

4. The injection mold for reducing residual stress of thin-walled parts according to claim 1, characterized in that: The heating rod (2) is symmetrically arranged on the front and rear sides of the upper mold frame (101), and comprises a mounting sleeve (201), a heating tube (202), a heating wire (203) and a screw (206); the mounting sleeve (201) is connected to the upper mold frame (101) and is correspondingly arranged on the front and rear side walls of the upper mold frame (101); the screws (206) are distributed on the mounting sleeve (201) at equal intervals around the circumference; the heating tube (202) is fixedly connected to the side of the mounting sleeve (201); the heating tube (202) is inserted into a heating hole opened in the mold core (103) at the upper end; and the heating wire (203) is arranged in the heating tube (202).

5. The injection mold for reducing residual stress of thin-walled parts according to claim 4, characterized in that: The heating rod (2) further comprises a water storage layer (204) and a graphene layer (205); the water storage layer (204) is arranged on the inner layer of the heating tube (202), and the graphene layer (205) is arranged on the outer layer of the heating tube (202).

6. The injection mold for reducing residual stress of thin-walled parts according to claim 1, characterized in that: The cooling mechanism (4) comprises a cooling water channel (401), a cooling water inlet (402), a cooling water inlet hole (403), a cooling water outlet hole (404) and a cooling water outlet (405); the cooling water channel (401) is spirally arranged on the outer peripheral wall of the insert (1022); the left and right side walls of the lower mold frame (102) are symmetrically provided with a cooling water inlet (402) and a cooling water outlet (405); the cooling water channel (401) is provided with a cooling water outlet hole (404) at the upper end surface of the insert (1022); the cooling water channel (401) is provided with a cooling water inlet hole (403) at the lower end surface of the insert (1022); the cooling water inlet (402) is connected to the cooling water outlet hole (404); and the cooling water outlet (405) is connected to the cooling water inlet hole (403).

7. The injection mold for reducing residual stress of thin-walled parts according to claim 6, characterized in that: The cooling water outlet hole (404) flows the cooling water to the cooling water inlet hole (403) through the spiral cooling water channel (401).

8. The injection mold for reducing residual stress of thin-walled parts according to claim 1, characterized in that: The ejection mechanism (3) comprises a first movable cavity (301), a spring rod (302), a top plate (303), an abutment block (304), a second movable cavity (305), a slide rail (306), a return spring (307) and a wedge block (308); the first movable cavity (301) is opened at the inner center of the insert (1022); a spring rod (302) is inserted into the interior of the first movable cavity (301); the upper end of the spring rod (302) is fixedly connected to the top plate (303); the lower end of the spring rod (302) is fixedly connected to the A contact block (304) is connected, a second movable cavity (305) communicating with the first movable cavity (301) is provided below the contact block (304), a slide rail (306) is provided on the side wall of the second movable cavity (305), and a return spring (307) is provided at the bottom of the second movable cavity (305), a wedge block (308) is fixedly connected to the end of the return spring (307), the wedge block (308) is slidably connected to the slide rail (306), and a side surface of the wedge block (308) close to the contact block (304) is an inclined surface.

9. The injection mold for reducing residual stress of thin-walled parts according to claim 8, characterized in that: The top plate (303) and the door opening surface at the upper end of the insert (1022) are adapted to each other, and the top plate (303) is located above the upper end of the insert (1022) before the mold is closed.

10. The injection mold for reducing residual stress of thin-walled parts according to claim 1, characterized in that: The auxiliary mechanism (5) comprises a mounting plate (501), a fixing sleeve (502), a cylinder (503), a fixing seat (504) and a guide rod (505); the mounting plate (501) is arranged on the bottom side wall of the lower mold frame (102); the cylinder (503) is fixedly mounted on the side wall of the lower mold frame (102) via the fixing sleeve (502); the output end of the cylinder (503) is fixedly connected to the fixing seat (504) provided on the side wall of the upper mold frame (101); the mounting plate (501) is symmetrically provided with guide rods (505) on both sides of the cylinder (503); and the upper mold frame (101) is slidably sleeved on the outside of the guide rods (505).

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