Gas-assisted demolding mold

Abstract

The utility model provides a gas-assisted demoulding mould which comprises an upper mould and a lower mould, the upper mould and the lower mould are in sliding connection through a guide pillar, one side of the upper mould close to the lower mould is provided with an upper mould cavity, one side of the lower mould close to the upper mould is provided with a lower mould cavity, the upper mould cavity and the lower mould cavity form a mould cavity, and a product is formed in the mould cavity through injection molding. The lower die is connected with a die core which is connected to the side, close to the upper die, of the lower die, forming cavities are formed in the two sides of the die core respectively, sliding blocks are arranged on the two sides of the die core respectively, inserts are connected to the ends, close to the die core, of the sliding blocks, forming grooves are formed in the sides, close to the die core, of the inserts, and the forming cavities and the forming grooves form a lower die cavity. The lower die is provided with an air channel. And when the mold is closed, the bottom surface of the insert seals the air passage. And when the mold is opened, the air passage is communicated with the lower mold cavity. Gas is used for assisting demolding, smooth demolding is guaranteed, demolding damage is reduced, and product quality is improved.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, specifically relating to a gas-assisted demolding mold. Background Technology

[0002] Injection molds can produce products with complex structures and textures, and a metallic feel. They can meet lightweight requirements while ensuring mechanical strength, and the short production cycle of injection-molded products meets the needs of rapid market iteration. With the development of high-performance materials, injection-molded products can meet the high strength and low weight requirements of the automotive and aerospace industries. Injection molding involves injecting molten plastic into the mold cavity, and after cooling, the mold opens for demolding. During demolding, the product and mold are prone to vacuum adhesion. Using traditional mechanical ejection methods can easily lead to product defects or failure to demold, especially for products with mirror-like surfaces and silicone products, where traditional ejection methods are inadequate.

[0003] Therefore, the above problems urgently need to be solved. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides a gas-assisted demolding mold, which uses gas to assist demolding, ensures smooth demolding, reduces demolding damage, and improves product quality.

[0005] Technical Solution: To achieve the above objectives, this utility model provides an air-assisted demolding mold, including an upper mold and a lower mold, which are slidably connected by guide pillars. The upper mold has an upper cavity near the lower mold, and the lower mold has a lower cavity near the upper mold. The upper and lower cavities constitute a mold cavity, in which the product is injection molded. A mold core is connected to the lower mold near the upper mold. Forming cavities are located on both sides of the mold core, and sliders are located on both sides of the mold core. The sliders are slidably connected to the lower mold via slider seats. An insert is connected to the end of the slider near the mold core, and a forming groove is located on the side of the insert near the mold core. The forming cavity and the forming groove form the lower mold cavity. An inclined guide pillar is connected to the upper mold, slidably connected to an inclined guide hole in the slider. An air passage is provided in the lower mold. One end of the air passage is connected to an air nozzle connected to the side wall of the lower mold, and the other end extends to the underside of the insert. When the mold is closed, the bottom surface of the insert seals the air passage. When the mold is opened, the air passage and the lower mold cavity are connected. In this invention, the air nozzle is connected to an air pipe, which in turn is connected to an air source. During mold closing, the upper and lower molds abut against each other, and the inclined guide post drives the slider to move towards the mold core. The bottom surface of the insert presses against the air outlet end face to form a seal. To achieve a better sealing effect, a sealing ring is provided on the air outlet end face. Molten plastic is then injected into the mold cavity, and after pressure holding and cooling, the mold separates. The mold separation process includes the separation of the upper and lower molds. The inclined guide post drives the slider to move away from the mold core. After the insert moves, the air outlet below it is exposed, and the air channel connects to the lower mold cavity. Gas compresses the product through the air channel, causing local deformation and detachment from the molding groove, thus loosening and demolding the product. This invention provides gas-assisted demolding, ensuring smooth demolding, reducing demolding damage, and improving product quality.

[0006] Furthermore, in the aforementioned air-assisted demolding mold, the air channels are L-shaped, including horizontal and vertical channels. An elastic plug is connected to the connecting end of the horizontal and vertical channels. The elastic plug includes a spring and a nozzle. The nozzle is coaxially and gap-connected in the horizontal channel, and the spring is connected between the nozzle and the bottom of the horizontal channel. A limit post is threaded into the horizontal channel, and the limit post compresses the nozzle to form a seal. The nozzle compresses the spring. A solenoid valve is connected to the air nozzle. When the mold is closed, the solenoid valve closes, cutting off the air supply. The spring pushes the nozzle against the limit post to form a seal. When the mold is opened, the solenoid valve opens, allowing air to enter. The air pushes the nozzle to compress the spring, causing the nozzle and limit post to separate. The air then enters the vertical channel through the gap between the nozzle and the horizontal channel, and enters the mold cavity to assist in demolding. Because it is equipped with a spring with a certain preload, when the air pressure outside the plug is greater than the spring preload, the horizontal and vertical air channels are connected, and the gas instantly enters the vertical air channel, creating an impact force on the product, loosening the product, and making demolding smoother.

[0007] Furthermore, in the aforementioned gas-assisted demolding mold, a positioning post is provided at the end of the plug near the limiting post, and a sealing gasket is provided on the outer sleeve of the positioning post. The sealing gasket is a flat washer, and the positioning post provides positioning for the sealing gasket. The sealing gasket is placed between the plug and the limiting post to improve the sealing effect and ensure sealing reliability.

[0008] Furthermore, in the aforementioned gas-assisted demolding mold, the outer periphery of the plug is provided with an air guide groove. The cross-section of the air guide groove is semi-circular, and the air guide groove extends along the axis of the plug and is arranged in an array along the outer periphery of the plug. The sealing gasket should avoid the air guide groove. The air guide groove is designed to allow gas to bypass the plug, ensuring unobstructed airflow.

[0009] Furthermore, in the aforementioned air-assisted demolding mold, the limiting post is a hollow cylinder, with the sealing gasket abutting against one end of the limiting post, forming a sealed connection. The outer wall of the limiting post has external threads, and the end of the limiting post away from the plug has a slot. The sealing gasket and the end face of the limiting post form a seal, and the outer circumference of the limiting post is threaded into the air passage, forming a seal. The slot is positioned in a straight line on the end face of the limiting post, allowing a screwdriver to be inserted into the slot to tighten the limiting post, improving ease of assembly and disassembly.

[0010] Furthermore, in the aforementioned air-assisted demolding mold, there are two or more mold cavities arranged in parallel. These multiple cavities are connected by flow channels, enabling the molding of multiple products at once and improving production efficiency.

[0011] Furthermore, in the aforementioned gas-assisted demolding mold, an ejection mechanism is connected to the lower mold on the side furthest from the upper mold. The ejector pins of the ejection mechanism extend into the mold cavity. During mold parting, the gas ejected from the air passages loosens the product, causing the slider and product to separate. Then, the ejector pins of the ejection mechanism eject the product out of the mold cavity. The combined action of the gas assistance and the ejector pins ensures smooth demolding and avoids product damage. The ejection mechanism includes an ejector base plate, an ejector plate, and ejector pins. The ejector base plate and ejector plate are slidably connected between the corner blocks. The ejector pins are connected to the ejector base plate and extend into the mold cavity after passing through the ejector plate. This ejection mechanism is a conventional design and will not be described in detail here.

[0012] Furthermore, in the aforementioned gas-assisted demolding mold, the ejection mechanism is connected to a base plate on the side away from the lower mold, and a fixing plate is connected to the side of the upper mold away from the lower mold. The fixing plate is connected to a nozzle, and the nozzle and the fixing plate have interconnected flow channels. Molten plastic flows from the nozzle into the flow channels and then into the mold cavity, which connects multiple mold cavities. A fixing ring is connected to the fixing plate.

[0013] As can be seen from the above technical solution, this utility model has the following beneficial effects: In the closed state, the bottom surface of the insert 24 presses against the outlet end face of the air channel 222 to form a seal. During mold separation, after the insert 24 moves, the outlet of the air channel 222 below it is exposed and connected to the lower mold cavity 21, allowing high-pressure gas to be introduced to assist in demolding, ensuring smooth demolding, reducing demolding damage, and improving product quality. Attached Figure Description

[0014] Figure 1 This is a front view of the air-assisted demolding mold of this utility model;

[0015] Figure 2 for Figure 1 The sectional view shown is along line AA.

[0016] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0017] Figure 4 for Figure 2 A magnified view of a portion of the image;

[0018] Figure 5 This is a schematic diagram of the structure of the plug;

[0019] Figure 6 This is a schematic diagram of the structure of the limiting post.

[0020] In the diagram: 1. Upper mold, 2. Lower mold, 11. Upper mold cavity, 12. Angled guide post, 21. Lower mold cavity, 22. Mold core, 221. Molding cavity, 222. Air passage, 2221. Horizontal air passage, 2222. Vertical air passage, 223. Air nozzle, 224. Elastic plug, 2241. Spring, 2242. Plug, 22421. Positioning post, 22422. Air guide groove, 2243. Limiting post, 22431. Slot, 2244. Sealing gasket, 23. Slider, 24. Insert, 241. Molding groove, 3. Mold cavity, 4. Ejection mechanism, 5. Base plate, 6. Fixing plate. Detailed Implementation

[0021] Example 1

[0022] like Figure 1-3The gas-assisted demolding mold shown includes an upper mold 1 and a lower mold 2, which are slidably connected by guide pillars. The upper mold 1 has an upper mold cavity 11 near the lower mold 2, and the lower mold 2 has a lower mold cavity 21 near the upper mold 1. The upper mold cavity 11 and the lower mold cavity 21 constitute a mold cavity 3, in which the product is injection molded. A mold core 22 is connected to the lower mold 2 near the upper mold 1. Molding cavities 221 are provided on both sides of the mold core 22, and sliders 23 are provided on both sides of the mold core 22. The sliders 23 are slidably connected to the lower mold 2 via slider seats. An insert 24 is connected to the end of the slider 23 near the mold core 22, and a molding groove 241 is provided on the side of the insert 24 near the mold core 22. The molding cavity 221 and the molding groove 241 form the lower mold cavity 21. An inclined guide pillar 12 is connected to the upper mold 1, and the inclined guide pillar 12 is slidably connected to the inclined guide hole provided in the slider 23. The lower mold 2 is provided with an air passage 222. One end of the air passage 222 is connected to an air nozzle 223 connected to the side wall of the lower mold 2, and the other end of the air passage 222 extends to the lower side of the insert 24. When the mold is closed, the bottom surface of the insert 24 seals the air passage 222. When the mold is opened, the air passage 222 communicates with the lower mold cavity 21. In order to obtain a better sealing effect, a sealing ring is provided on the outlet end face of the air passage 222.

[0023] In this embodiment, there are two or more mold cavities 3, which are arranged in parallel. The multiple mold cavities 3 are connected by flow channels, enabling the molding of multiple products at once and improving production efficiency.

[0024] In this embodiment, the lower mold 2 is connected to an ejector mechanism 4 on the side away from the upper mold 1. The ejector pins of the ejector mechanism 4 extend into the mold cavity 3. During the mold parting process, the gas ejected from the air passage 222 loosens the product, causing the slider 23 to separate from the product. Then, the ejector pins of the ejector mechanism 4 eject the product out of the mold cavity. The gas-assisted and ejector pin-assisted action ensures smooth demolding and avoids product damage. The ejector mechanism 4 includes an ejector base plate, an ejector plate, and an ejector pin. The ejector base plate and ejector plate are slidably connected between the corner blocks. The ejector pin is connected to the ejector base plate and extends into the mold cavity 3 after passing through the ejector plate. The ejector mechanism 4 is a conventional setting and will not be described in detail here.

[0025] In this embodiment, the ejector mechanism 4 is connected to a base plate 5 on the side away from the lower mold 2, and the upper mold 1 is connected to a fixing plate 6 on the side away from the lower mold 2. A nozzle is connected to the fixing plate 6, and flow channels communicate between the nozzle and the fixing plate 6. Molten plastic flows from the nozzle into the flow channels and then into the mold cavity 3, which connects multiple mold cavities. A fixing ring is connected to the fixing plate 6.

[0026] like Figure 4The air-assisted demolding mold shown has an L-shaped air passage 222, which includes a horizontal air passage 2221 and a vertical air passage 2222. An elastic plug 224 is connected to the connecting end of the horizontal and vertical air passages 2221. The elastic plug 224 includes a spring 2241 and a nozzle 2242. The nozzle 2242 is coaxially and loosely connected to the horizontal air passage 2221. The spring 2241 is connected between the nozzle 2242 and the bottom of the horizontal air passage 2221. A limit post 2243 is threaded into the horizontal air passage 2221, and the limit post 2243 compresses the nozzle 2242 to form a seal. The nozzle 2242 compresses the spring 2241, causing the spring 2241 to compress.

[0027] like Figure 5 The gas-assisted demolding mold shown has a positioning post 22421 near the end of the plug 2242 close to the limiting post 2243. A sealing gasket 2244 is fitted over the positioning post 22421. The sealing gasket 2244 is a flat washer, and the positioning post 22421 provides positioning for the sealing gasket 2244. The sealing gasket 2244 is placed between the plug 2242 and the limiting post 2243 to improve the sealing effect and ensure sealing reliability.

[0028] In this embodiment, the plug 2242 has an air guide groove 22422 on its outer periphery. The air guide groove 22422 has a semi-circular cross-section and extends along the axis of the plug 2242. The air guide grooves 22422 are arranged in an array along the outer periphery of the plug 2242. The sealing gasket 2244 should avoid the air guide groove 22422. The air guide groove 22422 is designed to allow gas to bypass the plug 2242, ensuring unobstructed airflow.

[0029] like Figure 6 The air-assisted demolding mold shown has a hollow cylindrical retaining post 2243. A sealing gasket 2244 abuts against one end of the retaining post 2243, forming a sealed connection. The outer wall of the retaining post 2243 has external threads, and the end of the retaining post 2243 away from the plug 2242 has a slot 22431. The sealing gasket 2244 and the end face of the retaining post 2243 form a seal. The outer circumference of the retaining post 2243 is threaded to the air passage 222, forming a seal. The slot 22432 is positioned in a straight line on the end face of the retaining post 2243. A screwdriver can be inserted into the slot 22432 to tighten the retaining post 2243, improving the ease of assembly and disassembly.

[0030] In this invention, the air nozzle 223 is connected to an air pipe, which is connected to an air source. An electromagnetic valve is connected in series with the air pipe, controlling the flow of the air source. The mold is connected to an injection molding machine, and the upper mold 1 and lower mold 2 abut against each other. The inclined guide post 12 drives the slider 23 to move towards the mold core 22, forming the mold cavity 3. The bottom surface of the insert 24 presses against the outlet end face of the air passage 222 to form a seal. The electromagnetic valve closes, cutting off the air source, and the spring 2241 pushes the plug 2242 against the limiting post 2243 to form a seal. Molten plastic flows from the nozzle into the runner and enters multiple mold cavities 3. After pressure holding and cooling, the mold is separated. The mold separation process includes the separation of the upper mold 1 and lower mold 2. The inclined guide post 12 drives the slider 23 to move away from the mold core 22. After the insert 24 moves, the outlet of the air passage 222 below it is exposed, and the air passage 222 communicates with the lower mold cavity 21. Simultaneously, the solenoid valve opens, and the gas pushes the plug 2242 to compress the spring 2241. The spring 2241 is compressed, and the plug 2242 and the limiting post 2243 separate. The gas enters the vertical air channel 2222 from the air guide groove 22422 and enters the mold cavity 3 to assist in demolding. Because the spring 2241 is provided and has a certain preload, when the air pressure outside the plug 2242 is greater than the preload of the spring 2241, the horizontal air channel 2221 and the vertical air channel 2222 are connected. The gas instantly enters the vertical air channel 2222, impacting the product and causing it to loosen, separating the product from the insert 24. Finally, the ejector pins of the ejection mechanism 4 eject the product from the lower mold cavity 21, completing the demolding.

[0031] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A gas-assisted demolding mold, characterized in that: The system includes an upper mold (1) and a lower mold (2), which are slidably connected by guide pillars. The upper mold (1) has an upper mold cavity (11) on the side near the lower mold (2), and the lower mold (2) has a lower mold cavity (21) on the side near the upper mold (1). The upper mold cavity (11) and the lower mold cavity (21) constitute a mold cavity (3), and the product is injection molded in the mold cavity (3). The lower mold (2) is connected to a mold core (22), which is connected to the side of the lower mold (2) near the upper mold (1). The mold core (22) has molding cavities (221) on both sides of its sides, and sliders (23) are provided on both sides of its sides. The sliders (23) are slidably connected to the lower mold (2) through slider seats. An insert (24) is connected to one end near the mold core (22). The insert (24) has a molding groove (241) on the side near the mold core (22). The molding cavity (221) and the molding groove (241) form the lower mold cavity (21). The upper mold (1) is connected to an inclined guide post (12). The inclined guide post (12) is slidably connected to the inclined guide hole provided in the slider (23). The lower mold (2) is provided with an air passage (222). One end of the air passage (222) is connected to the air nozzle (223) connected to the side wall of the lower mold (2). The other end of the air passage (222) extends to the lower side of the insert (24). When the mold is closed, the bottom surface of the insert (24) closes the air passage (222). When the mold is opened, the air passage (222) and the lower mold cavity (21) are connected.

2. The air-assisted demolding mold according to claim 1, characterized in that: The air passage (222) is L-shaped and includes a horizontal air passage (2221) and a vertical air passage (2222). The horizontal air passage (2221) and the vertical air passage (2222) are connected to an elastic plug (224) at their connecting ends. The elastic plug (224) includes a spring (2241) and a nozzle (2242). The nozzle (2242) is coaxially and gap-connected in the horizontal air passage (2221). The spring (2241) is connected between the nozzle (2242) and the bottom of the horizontal air passage (2221). The horizontal air passage (2221) is internally threaded with a limiting post (2243). The limiting post (2243) squeezes the nozzle (2242) to form a seal. The nozzle (2242) squeezes the spring (2241), causing the spring (2241) to compress.

3. The air-assisted demolding mold according to claim 2, characterized in that: The plug (2242) is provided with a positioning post (22421) at one end near the limiting post (2243), and a sealing gasket (2244) is provided on the outer sleeve of the positioning post (22421).

4. The air-assisted demolding mold according to claim 3, characterized in that: The plug (2242) is provided with an air guide groove (22422) on its outer periphery. The cross-section of the air guide groove (22422) is semi-circular. The air guide groove (22422) extends along the axis of the plug (2242) and is arranged in an array along the outer periphery of the plug (2242).

5. The air-assisted demolding mold according to claim 4, characterized in that: The limiting post (2243) is a hollow cylinder. The sealing gasket (2244) and the limiting post (2243) abut against each other, and the sealing gasket (2244) and the limiting post (2243) are sealed together. The outer wall of the limiting post (2243) is provided with external threads, and the end of the limiting post (2243) away from the plug (2242) is provided with a groove (22431).

6. The air-assisted demolding mold according to claim 1, characterized in that: The mold cavity (3) has two or more, and the mold cavities (3) are arranged in parallel.

7. The air-assisted demolding mold according to claim 1, characterized in that: The lower mold (2) is connected to an ejector mechanism (4) on the side away from the upper mold (1), and the ejector mechanism (4) has ejector pins that extend into the mold cavity (3).

8. The air-assisted demolding mold according to claim 7, characterized in that: The ejector mechanism (4) is connected to a base plate (5) on the side away from the lower mold (2), and the upper mold (1) is connected to a fixing plate (6) on the side away from the lower mold (2). The fixing plate (6) is connected to a nozzle, and the nozzle and the fixing plate (6) are connected by a flow channel.

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