Injection mold with vacuum function

Abstract

The application relates to the technical field of mold vacuumizing, in particular to an injection mold with a vacuumizing function, which comprises a main body, a top of the main body is fixedly connected with an injection assembly, and a top of the injection assembly is provided with a top press-fitting assembly; the gas in a mold cavity is ionized by using a getter ion pump, under the action of an anode cylinder, a cathode plate and a magnet arranged in the getter ion pump, the purpose of adsorption on the surface of the material is achieved, thereby air is extracted, the movable mold in the top plate is driven by a telescopic rod, the mold is automatically and rapidly closed and opened with the fixed mold, the movement stability of the telescopic rod reduces the damage of the demolding body to the plastic part during the demolding process, the quality of the plastic part is effectively ensured under the premise of improving the mold closing and opening efficiency, the waste product rate of the plastic part is reduced, the fitting of the fitting plate and the supporting horizontal plate and the fitting of the clamping clamping block and the bearing groove are realized, the whole mold is tightly sealed, and the sealing performance of the mold is further improved by using the rubber sealing gasket.

Description

Technical Field

[0001] This invention relates to the field of mold vacuum technology, specifically to an injection mold with vacuum function. Background Technology

[0002] Vacuum injection molding is a common plastic product manufacturing process. It utilizes vacuum suction to reduce internal air pressure during injection molding, thereby improving material flowability and enhancing the quality and appearance of the molded product. Research on the design and application of vacuum injection molding is of great significance to plastic product production. An injection mold is a tool for producing plastic products, giving them a complete structure and precise dimensions. An injection mold consists of two parts: a moving mold and a fixed mold. The moving mold is mounted on the moving platen of the injection molding machine, and the fixed mold is mounted on the fixed platen. During injection molding, the moving and fixed molds close to form the gating system and cavity. When the mold opens, the moving and fixed molds separate to remove the plastic product. The design of the vacuum injection mold is crucial for achieving vacuum injection molding. During injection molding, there is inevitably some gas inside the mold after mold closing. During filling, the gas in the cavity can be discharged through venting channels or vents. However, during rapid filling, the melt may clog the vents. Air trapped in the mold cavity due to air channels and vents can lead to defects such as insufficient filler and air bubbles in the molded part, affecting its quality. Simultaneously, the pressure within the cavity increases rapidly due to gas compression, which can cause mold deformation, resulting in overflow in certain areas, or even mold damage and shortening its lifespan. Other problems include insufficient filling, burns from compressed gas, high internal stress, surface defects such as flow lines, weld lines, and scorch marks. Incorporating a vacuum device into the mold to evacuate the cavity before injection filling effectively solves this problem. Air trapped during injection, caused by poor venting, adheres to the surface of the molded part. Gas released from the thermal decomposition of the plastic forms small, granular bubbles due to the depolymerization of the plastic. Surface bubbles are caused by gases released from the thermal decomposition of the plastic.

[0003] After the mold closes, the mold cores in the fixed and moving mold plates form a closed mold cavity, which can only communicate with the outside through the gate. When the molten plastic is injected from the gate, the gate is filled with plastic, and the air in the mold cavity cannot escape. The residual air is prone to generating bubbles during the pressing or injection process, resulting in poor lens molding quality. Some methods use the addition of venting grooves to release the vacuum in the mold cavity. However, if the venting groove is too large, material can easily enter the venting groove and form flash. If the venting groove is too small, the air in the mold may not be able to escape in time, causing material shortage or poor burning. Therefore, an injection mold with vacuum function is needed to improve the above problems. Summary of the Invention

[0004] To address the current problem where, after mold closure, the mold cores in the fixed and moving mold plates form a closed cavity that can only communicate with the outside through the gate, and when molten plastic is injected through the gate, the gate is filled with plastic, preventing air from escaping from the cavity. This residual air easily generates bubbles during pressing or injection molding, leading to poor lens molding quality. Some methods utilize venting grooves to release the vacuum within the mold cavity; however, if the venting groove is too large, material can easily enter and form flash; if the venting groove is too small, air inside the mold may not be able to escape in time, causing material shortages or poor burning. The purpose of this invention is to provide an injection mold with a vacuum function to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An injection mold with a vacuum function includes a main body, an injection molding assembly fixedly connected to the top of the main body, and a top pressing assembly provided on the top of the injection molding assembly. The main body includes a mounting base plate, a getter ion pump is fixedly connected to the side of the mounting base plate, an anode lead tube and an air inlet tube are fixedly connected to the side of the getter ion pump, an air delivery tube is fixedly connected to the side of the air inlet tube, and an anode cylinder, a cathode plate and a magnet are arranged inside the getter ion pump. The injection molding assembly includes a support plate, a fixed mold is fixedly connected inside the support plate, a support column is fixedly connected to the top of the support plate, a positioning plate is fixedly connected to the top of the support column, a telescopic rod is installed on the top of the positioning plate, a bearing groove is provided on the side of the support plate, a positioning tube seat is fixedly connected to the top of the positioning plate, and a positioning groove is provided inside the positioning plate. The top pressing assembly includes a top plate. The output end of the telescopic rod is fixedly connected to the top plate. A sleeve seat is fixedly connected to the bottom of the top plate. Four sleeve seats are provided. The positioning tube seat corresponds to and is used in conjunction with the sleeve seat. A moving mold, a fixing block, and a fixing seat are fixedly connected to the bottom of the top plate. A first connecting rod is fixedly connected to the bottom of the fixing block. A wedge plate is fixedly connected to the bottom of the first connecting rod. A rubber sealing gasket is fixedly connected to the side of the wedge plate. A second connecting rod is fixedly connected to the bottom of the fixing seat. The bottom of the second connecting rod is fixedly... The support plate is fixedly connected with a clamping block. The side of the support plate has four tubular grooves. The side of the support plate has two handles. The fitting plate and rubber sealing gaskets are four in total. The side of the fitting plate has a fixed rod. The fitting plate fits into the inside of the support plate. The fixed seat, the second connecting rod and the clamping block are two in total. The clamping block fits into the bearing groove. The top plate has a fixed plate fixedly connected to the top. The four fixing rods are connected to the fitting plate in pairs.

[0006] As a preferred embodiment of the present invention, a material conveying pipe is fixedly connected to the side of the mounting base plate, a valve is provided on the side of the material conveying pipe, an injection molding pipe is fixedly connected to the side of the material conveying pipe, a quantitative extractor is fixedly connected to the bottom of the material conveying pipe, and the injection molding pipe and the air conveying pipe extend into the interior of the fixed mold.

[0007] In a preferred embodiment of the present invention, four support columns and positioning tube seats are provided, and two bearing grooves are provided.

[0008] In a preferred embodiment of the present invention, the fixed mold and the moving mold are closed to form an injection cavity. The fixed mold is disposed inside the second connecting rod. An adjusting support rod is fixedly connected to the bottom of the mounting base plate. Four adjusting support rods are provided. The bottom of the adjusting support rod is fixedly connected to a foot. Four foot.

[0009] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the gas inside the mold cavity is ionized using a getter ion pump. Then, through the action of the anode cylinder, cathode plate, and magnet inside the getter ion pump, the gas is adsorbed onto the material surface, thus achieving gas extraction. There are two types: one is an evaporation ion pump, where the ionized gas continuously or intermittently sublimates and is adsorbed; the other is a sputtering ion pump, where the ionized ions are adsorbed onto the getter material continuously sputtered from the cathode, achieving gas extraction. Both types of ion pumps can be used as getter ion pumps to absorb the vacuum inside the mold cavity, thereby avoiding the flow rate of the injection filler affected by excessive internal resistance during injection. This allows for the injection of thin-walled plastic parts with uniform thickness, ensuring the quality of the entire injection-molded thin-walled plastic part. Furthermore, it can completely evacuate the cavity to achieve a vacuum state, preventing the generation of bubbles and flash during molding, and improving the quality of the plastic part.

[0010] 2. In this invention, by using a telescopic rod to drive the moving mold inside the top plate, the mold can be automatically and quickly closed and demolded with the fixed mold. The smooth movement of the telescopic rod reduces damage to the plastic part by the demolding body during the demolding process. While improving the efficiency of mold closing and demolding, the quality of the plastic part is effectively guaranteed and the scrap rate of the plastic part is reduced. The telescopic structure is simple to set up and easy to install and use.

[0011] 3. In this invention, by utilizing the internal fitting of the fitting plate and the supporting horizontal plate and the fitting of the clamping block and the bearing groove, the entire mold is made to fit together perfectly. In addition, the use of rubber sealing gaskets further improves the sealing performance of the upper and lower molds of the injection mold, thereby improving the product production quality. This solves the problem that poor sealing performance can lead to pits on the surface of the molded product, which affects the product production quality. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the bottom support component structure of the present invention; Figure 3 This is a schematic diagram of the liquid injection assembly structure of the present invention; Figure 4 This is a schematic diagram of the vacuum pumping assembly structure of the present invention; Figure 5 This is a schematic diagram of the top press-fit assembly structure of the present invention; Figure 6 This is a schematic diagram of the snap-fit ​​assembly structure of the present invention.

[0013] In the diagram: 1. Main body; 101. Support plate; 102. Adjustable support rod; 103. Foot; 104. Material conveying pipe; 105. Valve; 106. Quantitative extractor; 107. Injection molding pipe; 108. Gas conveying pipe; 109. Getter ion pump; 110. Anode lead pipe; 111. Air inlet pipe; 2. Injection molding assembly; 201. Supporting horizontal plate; 202. Fixed mold; 203. Tube groove; 204. Handle; 205. Bearing groove; 206. Support column; 207. Positioning plate; 208. Positioning tube seat; 209. Positioning groove; 210. Telescopic rod; 3. Top pressing assembly; 301. Top plate; 302. Sleeve seat; 303. Moving mold; 304. Fixing block; 305. First connecting rod; 306. Fitting plate; 307. Fixing rod; 308. Fixing seat; 309. Second connecting rod; 310. Clamping block; 311. Rubber sealing gasket; 312. Top plate. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0015] Example: Please refer to Figures 1-6 The injection mold shown includes a main body 1, an injection molding component 2 fixedly connected to the top of the main body 1, and a top pressing component 3 provided on the top of the injection molding component 2. In this embodiment, reference is made to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the main body 1 includes a mounting base plate 101. A getter ion pump 109 is fixedly connected to the side of the mounting base plate 101. An anode lead tube 110 and an air inlet pipe 111 are fixedly connected to the side of the getter ion pump 109. An air supply pipe 108 is fixedly connected to the side of the air inlet pipe 111. An anode cylinder, a cathode plate, and a magnet are arranged inside the getter ion pump 109. The injection molding assembly 2 includes a supporting horizontal plate 201. A fixed mold 202 is fixedly connected to the inside of the supporting horizontal plate 201. A support column 206 is fixedly connected to the top of the supporting horizontal plate 201. A positioning plate 207 is fixedly connected to the top of the support column 206. A telescopic rod 210 is installed on the top of plate 207. A bearing groove 205 is provided on the side of the supporting plate 201. A positioning tube seat 208 is fixedly connected to the top of positioning plate 207. A positioning groove 209 is provided inside positioning plate 207. The top pressing assembly 3 includes a top plate 301. The output end of the telescopic rod 210 is fixedly connected to the top plate 301. A sleeve seat 302 is fixedly connected to the bottom of the top plate 301. Four sleeve seats 302 are provided. The positioning tube seat 208 is positioned corresponding to and used in conjunction with the sleeve seat 302. A moving mold 303, a fixing block 304, and a fixing seat 308 are fixedly connected to the bottom of the top plate 301. A first connecting rod 305 is fixedly connected to the bottom of the fixing block 304. A fitting plate 306 is fixedly connected to the bottom of the first connecting rod 305. A rubber sealing gasket 311 is fixedly connected to the side of the fitting plate 306. A second connecting rod 309 is fixedly connected to the bottom of the fixing seat 308. A clamping block 310 is fixedly connected to the bottom of the second connecting rod 309. The gas inside the mold cavity is ionized by the getter ion pump 109. Then, under the action of the anode cylinder, cathode plate and magnet inside the getter ion pump 109, the gas is adsorbed onto the surface of the material, thereby achieving gas extraction. This is further divided into two types: one is evaporation ionization. One type of ion pump is used to continuously or intermittently sublimate and adsorb ionized gas. Another type is a sputtering ion pump, in which ionized ions are adsorbed onto the getter material continuously sputtered from the cathode to achieve gas adsorption. Both types of ion pumps can be used as getters. Ion pump 109 adsorbs the vacuum in the mold cavity, thereby avoiding the flow rate of the injection filler affected by excessive internal resistance of the cavity during injection. It can inject thin-walled plastic parts with uniform thickness, ensuring the quality of the entire injection-molded thin-walled plastic parts. It can also completely evacuate the air in the cavity to achieve a vacuum state, preventing the generation of bubbles and flash during the molding process, and improving the quality of the plastic parts.

[0016] The base plate 101 is fixedly connected to a material conveying pipe 104, a valve 105 is installed on the side of the material conveying pipe 104, an injection molding pipe 107 is fixedly connected to the side of the material conveying pipe 104, and a quantitative extractor 106 is fixedly connected to the bottom of the material conveying pipe 104. The injection molding pipe 107 and the air conveying pipe 108 extend into the interior of the fixed mold 202. Four support columns 206 and positioning tube seats 208 are provided. Two bearing grooves 205 are provided. A tubular groove 203 is provided on the side of the supporting horizontal plate 201. Four handles 204 are fixedly connected to the side of the supporting horizontal plate 201. There are two handles 204. The telescopic rod 210 drives the moving mold 303 inside the top plate 301 to automatically and quickly close and demold with the fixed mold 202. The smooth movement of the telescopic rod 210 reduces the damage to the plastic part during demolding. While improving the efficiency of mold closing and demolding, it effectively ensures the quality of the plastic part and reduces the scrap rate. The telescopic rod 210 has a simple structure and is easy and convenient to install and use.

[0017] In this embodiment, reference is made to Figure 1 , Figure 5 and Figure 6 As shown, four mating plates 306 and rubber sealing gaskets 311 are provided. A fixing rod 307 is fixedly connected to the side of the mating plate 306. The mating plate 306 fits into the interior of the supporting horizontal plate 201. Two fixing seats 308, second connecting rods 309, and clamping blocks 310 are provided. The clamping blocks 310 fit into the bearing groove 205. A top plate 312 is fixedly connected to the top of the top plate 301. Four fixing rods 307 are provided, and each fixing rod 307 is connected to a mating plate 306 in pairs. The fixed mold 202 and the moving mold 303 close to form an injection cavity. The fixed mold 202 is located inside the second connecting rod 309. The mating plates 306 fit into the interior of the supporting horizontal plate 201, and the clamping blocks 310 fit into the bearing groove. The 205 fit ensures a tight seal throughout the mold, and when used in conjunction with the 311 rubber gasket, it further enhances the sealing performance of the upper and lower molds, thereby improving product quality. This solves the problem of poor sealing leading to pits on the surface of the molded product, which negatively impacts product quality. Excellent sealing performance: The rubber gasket effectively prevents leakage of air, water, and other media. The 311 rubber gasket provides superior sealing performance. High wear resistance: Special rubber materials, such as silicone rubber, offer excellent wear resistance, effectively extending the gasket's service life. Good elasticity and toughness: The 311 rubber gasket exhibits good elasticity and toughness, adapting to deformation and vibration in various environments.

[0018] The bottom of the mounting base plate 101 is fixedly connected to an adjustable support rod 102, of which four adjustable support rods 102 are provided. The bottom of the adjustable support rod 102 is fixedly connected to a foot 103, of which four foot 103 are provided. The adjustable support rod 102 has reasonable force distribution and high load-bearing capacity, which can effectively reduce the number of support rods and reduce construction costs. The adjustable support rod 102 is not constrained by the fixed plane size, has strong versatility, can adapt to different devices, can automatically adjust the height of the equipment and has good stability. The adjustable support rod 102 continuously innovates its product process, starting from the product structure and performance, to optimize the product and enable it to play a better role in supporting the equipment and adjusting its height.

[0019] In this solution, an injection mold with a vacuum function is used to move the moving mold 303 inside the top plate 301 downwards using the telescopic rod 210, so that the moving mold 303 enters the fixed mold 202. During the downward movement, the fitting plate 306 fits with the inside of the supporting horizontal plate 201, and the clamping block 310 fits with the bearing groove 205, so that the entire mold is tightly sealed and its internal sealing is maintained when the mold is closed. The injection liquid is extracted into the delivery pipe 104 using the quantitative extractor 106. The valve 105 is opened so that the injection liquid enters the fixed mold 202 through the injection pipe 107 and closes with the moving mold 303 to form the injection cavity. The gas inside the mold cavity is ionized by the getter ion pump 109. Then, under the action of the anode cylinder, cathode plate and magnet inside the getter ion pump 109, the gas is adsorbed onto the surface of the material, thereby achieving the purpose of vacuuming. The molding is completed when the plastic is formed.

[0020] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An injection mold with a vacuum function, comprising a main body (1), characterized in that: The top of the main body (1) is fixedly connected to an injection molding assembly (2), and the top of the injection molding assembly (2) is provided with a top pressing assembly (3). The main body (1) includes a mounting base plate (101), a getter ion pump (109) is fixedly connected to the side of the mounting base plate (101), an anode lead tube (110) and an air inlet pipe (111) are fixedly connected to the side of the getter ion pump (109), and a gas delivery pipe (108) is fixedly connected to the side of the air inlet pipe (111). An anode cylinder, a cathode plate and a magnet are provided inside the getter ion pump (109). The injection molding assembly (2) includes a support plate (201), a fixed mold (202) is fixedly connected inside the support plate (201), a support column (206) is fixedly connected to the top of the support plate (201), a positioning plate (207) is fixedly connected to the top of the support column (206), a telescopic rod (210) is installed on the top of the positioning plate (207), a bearing groove (205) is provided on the side of the support plate (201), a positioning tube seat (208) is fixedly connected to the top of the positioning plate (207), and a positioning groove (209) is provided inside the positioning plate (207). The top pressing assembly (3) includes a top plate (301), the output end of the telescopic rod (210) is fixedly connected to the top plate (301), a sleeve seat (302) is fixedly connected to the bottom of the top plate (301), four sleeve seats (302) are provided, the positioning tube seat (208) corresponds to the sleeve seat (302) and is used in conjunction with it, the bottom of the top plate (301) is fixedly connected to a moving mold (303), a fixing block (304) and a fixing seat (308), the bottom of the fixing block (304) is fixedly connected to a first connecting rod (305), the bottom of the first connecting rod (305) is fixedly connected to a fitting plate (306), the side of the fitting plate (306) is fixedly connected to a rubber sealing gasket (311), the bottom of the fixing seat (308) is fixedly connected to a second connecting rod (309), the bottom of the second connecting rod (309) is fixedly connected to... There is a clamping block (310), and the side of the supporting horizontal plate (201) is provided with a tubular groove (203), and there are four tubular grooves (203). The side of the supporting horizontal plate (201) is fixedly connected with a handle (204), and there are two handles (204). There are four mating plates (306) and rubber sealing gaskets (311). The side of the mating plate (306) is fixedly connected with a fixing rod (307). The fitting plate (306) fits inside the supporting cross plate (201). There are two of the fixed seat (308), the second connecting rod (309) and the clamping block (310). The clamping block (310) fits into the bearing groove (205). The top plate (312) is fixedly connected to the top of the top plate (301). There are four fixed rods (307). The fixed rods (307) are connected to the fitting plate (306) in pairs.

2. The injection mold with vacuum function according to claim 1, characterized in that: A material conveying pipe (104) is fixedly connected to the side of the mounting base plate (101). A valve (105) is provided on the side of the material conveying pipe (104). An injection molding pipe (107) is fixedly connected to the side of the material conveying pipe (104). A quantitative extractor (106) is fixedly connected to the bottom of the material conveying pipe (104). The injection molding pipe (107) and the air conveying pipe (108) extend into the interior of the fixed mold (202).

3. The injection mold with vacuum function according to claim 1, characterized in that: Four support columns (206) and positioning tube seats (208) are provided, and two bearing grooves (205) are provided.

4. The injection mold with vacuum function according to claim 1, characterized in that: The fixed mold (202) and the moving mold (303) close to form an injection cavity. The fixed mold (202) is located inside the second connecting rod (309). The bottom of the mounting base plate (101) is fixedly connected to an adjusting support rod (102). There are four adjusting support rods (102). The bottom of the adjusting support rod (102) is fixedly connected to a foot (103). There are four foot (103).

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