Injection mold for automotive upholstery

Abstract

The invention relates to the technical field of injection molds, in particular to an injection mold for automotive upholstery, comprising an upper mold frame and a lower mold frame; a lower mold core is arranged at the top of the lower mold frame; an upper mold core is arranged at the bottom of the upper mold frame; the lower mold core is provided with a forming cavity; the upper mold core is provided with a forming plate; the forming plate is provided with a forming block; the upper mold frame is provided with an injection molding opening; an ejection cavity is formed between the forming plate and the upper die frame; the material ejecting cavity is provided with a material ejecting plate; the ejector plate is provided with an ejector rod; the ejector rod is movably arranged on the forming block in a penetrating mode. An air blowing opening is formed in the top of the ejector rod; and the ejector rod is provided with an air blowing channel. In the ejection process of the ejection rod, air is introduced into the air blowing channel, on one hand, cooling and shaping of the automotive upholstery can be accelerated, on the other hand, the air can be matched with the ejection rod to push the automotive upholstery away from the forming block, and smooth demolding is achieved.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and specifically to an injection mold for automotive interior parts. Background Technology

[0002] As a crucial component of the automotive cabin, the smoothness and dimensional accuracy of automotive interior parts directly impact the overall assembly effect and driving experience. Currently, the industry commonly employs injection molding to manufacture automotive interior parts, and the corresponding injection molds are typically equipped with ejector-type demolding mechanisms. The working principle of this type of mechanism is as follows: after the injection molded part completes melt filling and initial pressure holding, a drive device propels the ejector pin in a linear reciprocating motion. The end of the ejector pin pushes against the inner surface of the injection molded part, ejecting it from the mold cavity, thus completing the demolding process.

[0003] However, automotive interior parts are mostly characterized by thin walls, irregular shapes, and large surface areas. After injection molding, they require a sufficient holding and cooling process to ensure the molecular chains of the molded parts are fully set, guaranteeing the product's rigidity and dimensional stability. In actual production, to improve production cycle time and reduce time costs, in many production scenarios, the ejector pins are activated for large-stroke ejection operations before the injection molded parts have completely cooled and solidified. Because the injection molded parts that have not fully cooled have lower strength and poor resistance to deformation, and the ejection force of the ejector pins is concentrated on a localized area of ​​the injection molded parts, it is very easy to cause defects such as warping, dents, and localized tensile deformation.

[0004] Deformation of injection molded parts can lead to two key problems: First, the increased adhesion stress between the deformed injection molded part and the inner wall of the mold cavity results in a significant increase in ejection resistance, making demolding difficult. In severe cases, the injection molded part may even become stuck in the mold cavity and cannot be removed smoothly. Second, deformation defects directly affect the appearance quality and assembly precision of automotive interior parts, leading to high rework and scrap rates and increasing production costs.

[0005] To address the aforementioned issues, existing technologies offer two improvement approaches: one is to extend the mold's cooling time, thereby increasing the degree of solidification of the injection molded part to reduce the risk of deformation. However, this method significantly extends the single molding cycle, reduces production efficiency, and is difficult to adapt to the needs of large-scale mass production. The other approach is to add multiple sets of ejector pins to distribute the ejection force. However, this method can only alleviate the problem of local deformation to a certain extent, and too many ejector pins will increase the processing difficulty and assembly complexity of the mold. In addition, the presence of ejector pin holes may leave ejection marks on the surface of the injection molded part, affecting the product's appearance. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned shortcomings in the prior art by providing an injection mold for automotive interior parts.

[0007] The objective of this invention is achieved through the following technical solution: an injection mold for automotive interior parts, comprising an upper mold frame and a lower mold frame that is movably and vertically disposed on the upper mold frame; a lower mold core is provided at the top of the lower mold frame; an upper mold core is provided at the bottom of the upper mold frame; a molding cavity is provided in the lower mold core; a molding plate is provided in the upper mold core; a molding block that mates with the molding cavity is provided in the molding plate; and an injection port for communicating with the molding cavity is provided in the upper mold frame. A top material cavity is formed between the forming plate and the upper mold frame; a top material plate is movably mounted in the top material cavity; a top material rod is mounted on the top material plate; the top material rod is movably mounted through the forming block; an air blowing port is provided at the top of the top material rod; and an air blowing channel communicating with the air blowing port is provided through the top material rod.

[0008] The present invention is further configured such that a first spring is provided between the bottom of the top plate and the top of the forming plate.

[0009] The present invention is further configured such that the top material plate is movably and sealingly mounted in the top material cavity; a pushing cavity is formed between the top of the top material plate and the top material cavity; and the top of the air blowing channel is connected to the pushing cavity.

[0010] The present invention is further configured such that the upper mold frame is provided with an air storage tank; the air storage tank is connected to a connecting pipe; the upper mold frame is provided with an air vent connected to the pushing cavity; and an air valve is provided between the connecting pipe and the air vent.

[0011] The present invention is further configured such that the air valve includes a valve body disposed on the upper mold frame and a valve core disposed movably within the valve body; the valve core is provided with a ventilation channel for communicating with a connecting pipe and a vent. A second spring is provided between the valve core and the valve body; the second spring is used to disconnect the connecting pipe from the vent.

[0012] The present invention is further configured such that the upper mold frame is provided with a driving cavity; the driving cavity is provided with a piston component that is sealed and lifted; a third spring is provided between the top of the piston component and the driving cavity; the valve core is provided with a first inclined surface; and the bottom of the piston component is provided with a second inclined surface that cooperates with the first inclined surface.

[0013] The present invention is further configured such that the upper mold frame is provided with a first one-way valve that opens toward the drive cavity.

[0014] The present invention is further configured such that a second one-way valve that opens toward the gas storage tank is provided between the driving chamber and the gas storage tank.

[0015] The present invention is further configured such that the lower mold frame is provided with guide posts; and the upper mold frame is provided with guide grooves that cooperate with the guide posts.

[0016] The present invention is further configured such that after the lower mold frame and the upper mold frame are closed, the guide post passes through the guide groove and abuts against the bottom of the piston component.

[0017] The beneficial effects of the present invention are as follows: During the ejection process of the ejector rod, by introducing gas into the air blowing channel, the cooling and shaping of the automotive interior parts can be accelerated. On the other hand, the gas can work with the ejector rod to push the automotive interior parts away from the molding block, thus achieving smooth demolding. Attached Figure Description

[0018] The invention will be further illustrated with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the invention. For those skilled in the art, other drawings can be obtained based on the following drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the upper mold frame of the present invention; Figure 3 This is a structural schematic diagram of the upper mold frame from another perspective of the present invention; Figure 4 This is a cross-sectional view of the present invention; Figure 5 yes Figure 4 A magnified view of part A in the middle; The components are as follows: 1. Upper mold frame; 11. Upper mold core; 12. Injection port; 2. Lower mold frame; 21. Lower mold core; 22. Molding cavity; 3. Molding plate; 31. Molding block; 4. Ejector cavity; 41. Ejector plate; 42. Ejector rod; 43. Air inlet; 44. Air channel; 45. First spring; 46. Pushing cavity; 47. Vent; 5. Air tank; 51. Connecting pipe; 6. Valve body; 61. Valve core; 62. Vent channel; 63. Second spring; 64. First inclined surface; 7. Drive cavity; 71. Piston; 72. Third spring; 73. Second inclined surface; 74. First one-way valve; 75. Second one-way valve; 81. Guide post; 82. Guide groove. Detailed Implementation

[0020] The present invention will be further described in conjunction with the following embodiments.

[0021] Depend on Figures 1 to 5 As can be seen, the injection mold for an automotive interior part described in this embodiment includes an upper mold frame 1 and a lower mold frame 2 that is movably and vertically disposed on the upper mold frame 1; the top of the lower mold frame 2 is provided with a lower mold core 21; the bottom of the upper mold frame 1 is provided with an upper mold core 11; the lower mold core 21 is provided with a molding cavity 22; the upper mold core 11 is provided with a molding plate 3; the molding plate 3 is provided with a molding block 31 that cooperates with the molding cavity 22; the upper mold frame 1 is provided with an injection port 12 for communicating with the molding cavity 22; A top material cavity 4 is formed between the molding plate 3 and the upper mold frame 1; a top material plate 41 is movably mounted in the top material cavity 4; a top material rod 42 is mounted on the top material plate 41; the top material rod 42 is movably mounted through the molding block 31; an air blowing port 43 is provided at the top of the top material rod 42; and an air blowing channel 44 communicating with the air blowing port 43 is provided through the top material rod 42.

[0022] Specifically, in the injection mold of the automotive interior parts described in this embodiment, when the automotive interior parts are injection molded, the upper mold frame 1 and the lower mold frame 2 are first closed. After the upper mold frame 1 and the lower mold frame 2 are closed, an injection cavity is formed between the molding block 31 and the molding cavity 22. Plastic is introduced into the injection cavity through the injection port 12, thereby forming the automotive interior parts in the injection cavity. Next, the upper mold frame 1 and the lower mold frame 2 are opened. The upper mold frame 1 takes away the molded automotive interior parts. Then, the ejector rod 42 moves downward and gradually protrudes from the molding block 31. During this process, gas is introduced into the air blowing channel 44. On the one hand, this can accelerate the cooling and shaping of the automotive interior parts. On the other hand, the gas can work with the ejector rod 42 to push the automotive interior parts away from the molding block 31, achieving smooth demolding.

[0023] In this embodiment, an injection mold for automotive interior parts is provided, with a first spring 45 between the bottom of the ejector plate 41 and the top of the molding plate 3. This design prevents the ejector rod 42 from protruding from the molding block 31 during injection molding, thus ensuring a high yield rate for the automotive interior parts.

[0024] In this embodiment, an injection mold for an automotive interior component is provided. The top plate 41 is movably and sealingly mounted in the top cavity 4. A pushing cavity 46 is formed between the top of the top plate 41 and the top cavity 4. The top of the air blowing channel 44 communicates with the pushing cavity 46. In this embodiment, an injection mold for an automotive interior component is provided. The upper mold frame 1 is provided with an air tank 5. The air tank 5 is connected to a connecting pipe 51. The upper mold frame 1 is provided with a vent 47 communicating with the pushing cavity 46. An air valve is provided between the connecting pipe 51 and the vent 47. In this embodiment, an injection mold for an automotive interior component is provided. The air valve includes a valve body 6 located in the upper mold frame 1 and a valve core 61 movably and sealingly mounted within the valve body 6. The valve core 61 is provided with a venting channel 62 communicating with the connecting pipe 51 and the vent 47. A second spring 63 is provided between the valve core 61 and the valve body 6. The second spring 63 is used to disconnect the connecting pipe 51 from the vent 47. This embodiment of an injection mold for automotive interior parts includes an upper mold frame 1 with a drive cavity 7; a piston 71 is movably and sealingly mounted in the drive cavity 7; a third spring 72 is provided between the top of the piston 71 and the drive cavity 7; a valve core 61 has a first inclined surface 64; and a second inclined surface 73, which mates with the first inclined surface 64, is provided at the bottom of the piston 71. In this embodiment of an injection mold for automotive interior parts, the upper mold frame 1 has a first one-way valve 74 that opens towards the drive cavity 7. In this embodiment of an injection mold for automotive interior parts, the drive cavity 7 has a second one-way valve 75 that opens towards the air tank 5, which is located between the air tank 5 and the air reservoir 7. In this embodiment of an injection mold for automotive interior parts, the lower mold frame 2 has a guide post 81; and the upper mold frame 1 has a guide groove 82 that mates with the guide post 81. In this embodiment of an injection mold for automotive interior parts, after the lower mold frame 2 and the upper mold frame 1 are closed, the guide post 81 passes through the guide groove 82 and abuts against the bottom of the piston 71.

[0025] Specifically, in the injection mold of the automotive interior parts described in this embodiment, during the mold closing process, the guide post 81 passes through the guide groove 82 and abuts against the bottom of the piston 71. As the lower mold frame 2 and the upper mold frame 1 approach each other, the piston 71 gradually moves upward against the action of the third spring 72, and the first inclined surface 64 separates from the second inclined surface 73. Under the action of the second spring 63, the ventilation channel 62 is offset from the connecting pipe 51 and the vent 47, respectively, so that the connecting pipe 51 and the vent 47 are disconnected. Then, as the piston 71 rises, the first one-way valve 74 closes and the second one-way valve 75 opens, so that the gas in the drive chamber 7 flows to the gas storage tank 5 for storage through the second one-way valve 75. Under the action of the first spring 45, the ejector rod 42 retracts into the molding block 31.

[0026] After the upper mold frame 1 and the lower mold frame 2 are closed, an injection cavity is formed between the molding block 31 and the molding cavity 22. Plastic is introduced into the injection cavity through the injection port 12, thereby forming an automotive interior part in the injection cavity. Next, the upper mold frame 1 and the lower mold frame 2 are opened. The upper mold frame 1 takes away the molded automotive interior parts, and the guide post 81 gradually exits from the guide groove 82. Under the action of the third spring 72, the piston 71 gradually moves downward. During this process, the first one-way valve 74 opens and the second one-way valve 75 closes, allowing external air to enter the drive chamber 7 through the first one-way valve 74. When the piston 71 moves to the bottom of the drive chamber 7, the second inclined surface 73 of the piston 71 abuts against the first inclined surface 64 of the valve core 61, and pushes the valve core 61 to move against the action of the second spring 63, thereby aligning the venting channel 62 with the connecting pipe 51 and the vent 47 respectively. At this time, the connecting pipe 51 and the vent 47 are aligned. The vent 47 is connected, allowing the gas in the gas tank 5 to enter the pushing chamber 46 after passing through the connecting pipe 51, the venting channel 62, and the vent 47. Since the volume of the gas tank 5 and the gas in the pushing chamber 46 are much larger than the volume of the blowing channel 44, after the gas in the gas tank 5 enters the pushing chamber 46, part of the gas can push the top plate 41 to move downward against the action of the first spring 45, causing the top rod 42 to protrude out of the molding block 31. The other part of the gas can be blown out from the blowing port 43 after passing through the blowing channel 44, thereby accelerating the cooling and shaping of the automotive interior parts. Furthermore, the blown gas can work with the top rod 42 to push the automotive interior parts away from the molding block 31, achieving smooth demolding.

[0027] This embodiment employs a dual-action demolding mechanism combining ejector pin 42 and air-assisted ejection. Compared to the traditional single ejector pin structure, ejector pin 42 provides stable support and pushing force, while the gas blown from air outlet 43 forms a uniform air cushion layer between the injection molded part and the molding block 31. On one hand, the air cushion layer can disperse the ejection force and avoid local stress concentration, effectively preventing defects such as warping, dents, and tensile deformation even if the injection molded part is not completely cooled. On the other hand, the air cushion layer can fill the gap between the injection molded part and the molding block 31, offsetting the bonding stress, significantly reducing demolding resistance, and completely solving the problem of the injection molded part being stuck and unable to be removed. This ensures the dimensional accuracy and appearance flatness of the automotive interior parts, meeting the stringent requirements of vehicle assembly for interior parts.

[0028] In addition, the air blowing structure in this embodiment not only assists in demolding, but also acts directly on the surface of the injection molded part, accelerating the rapid dissipation of heat and significantly shortening the cooling and curing cycle. There is no need to extend the molding time to improve the curing degree of the product, which greatly improves the production cycle while ensuring product quality.

[0029] Furthermore, this embodiment achieves uniform force distribution without the need for additional sets of ejector pins, avoiding the increased difficulty in mold processing and complex assembly caused by multiple ejector pin designs. At the same time, the piston component 71 is driven by the mold closing action to compress gas and store it in the air storage tank 5. When the mold opens, the air valve is automatically triggered by mechanical linkage to achieve synchronous linkage between ejection and air blowing. There is no need to configure additional driving devices such as cylinders and air pumps, which simplifies the mold structure and reduces the mold manufacturing cost, assembly difficulty and subsequent maintenance cost.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An injection mold for automotive interior parts, characterized in that: The system includes an upper mold frame (1) and a lower mold frame (2) that is movably mounted on the upper mold frame (1); the lower mold frame (2) has a lower mold core (21) at its top; the upper mold frame (1) has an upper mold core (11) at its bottom; the lower mold core (21) has a molding cavity (22); the upper mold core (11) has a molding plate (3); the molding plate (3) has a molding block (31) that mates with the molding cavity (22); and the upper mold frame (1) has an injection port (12) for communicating with the molding cavity (22). A top material cavity (4) is formed between the molding plate (3) and the upper mold frame (1); the top material cavity (4) is equipped with a top material plate (41) that moves up and down; the top material plate (41) is equipped with a top material rod (42); the top material rod (42) moves through the molding block (31); the top of the top material rod (42) is equipped with an air blowing port (43); the top material rod (42) is provided with an air blowing channel (44) that communicates with the air blowing port (43).

2. The injection mold for an automotive interior component according to claim 1, characterized in that: A first spring (45) is provided between the bottom of the top plate (41) and the top of the forming plate (3).

3. The injection mold for an automotive interior part according to claim 2, characterized in that: The top plate (41) is sealed and movable in the top material cavity (4); a pushing cavity (46) is formed between the top of the top plate (41) and the top material cavity (4); the top of the air blowing channel (44) is connected to the pushing cavity (46).

4. The injection mold for an automotive interior part according to claim 3, characterized in that: The upper mold frame (1) is provided with an air storage tank (5); the air storage tank (5) is connected to a connecting pipe (51); the upper mold frame (1) is provided with an air vent (47) connected to the pushing cavity (46); an air valve is provided between the connecting pipe (51) and the air vent (47).

5. The injection mold for an automotive interior part according to claim 4, characterized in that: The valve includes a valve body (6) disposed on the upper mold frame (1) and a valve core (61) disposed in the valve body (6) in a sealed manner; the valve core (61) is provided with a ventilation channel (62) for communicating with the connecting pipe (51) and the ventilation port (47); A second spring (63) is provided between the valve core (61) and the valve body (6); the second spring (63) is used to disconnect the connecting pipe (51) from the vent (47).

6. The injection mold for an automotive interior part according to claim 5, characterized in that: The upper mold frame (1) is provided with a drive cavity (7); the drive cavity (7) is provided with a piston component (71) for sealing and lifting movement; a third spring (72) is provided between the top of the piston component (71) and the drive cavity (7); the valve core (61) is provided with a first inclined surface (64); the bottom of the piston component (71) is provided with a second inclined surface (73) that cooperates with the first inclined surface (64).

7. The injection mold for an automotive interior part according to claim 6, characterized in that: The upper mold frame (1) is provided with a first one-way valve (74) that opens toward the drive cavity (7).

8. The injection mold for an automotive interior part according to claim 6, characterized in that: A second check valve (75) is provided between the drive chamber (7) and the gas storage tank (5) and opens toward the gas storage tank (5).

9. The injection mold for an automotive interior part according to claim 6, characterized in that: The lower mold frame (2) is provided with guide posts (81); the upper mold frame (1) is provided with guide grooves (82) that cooperate with the guide posts (81).

10. The injection mold for an automotive interior part according to claim 9, characterized in that: After the lower mold frame (2) and the upper mold frame (1) are closed, the guide post (81) passes through the guide groove (82) and abuts against the bottom of the piston component (71).

Images