Injection mold capable of automatically cutting off water gap in mold

Abstract

The invention discloses an injection mold capable of automatically cutting off a water gap in the mold, and relates to injection molds. According to the technical scheme, the mold is characterized by comprising a lower mold and an upper mold, a main pouring gate is formed in the middle of the surface of the lower mold, a plurality of pouring grooves are formed in the positions, located on the two sides of the main pouring gate, of the surface of the lower mold, and branch pouring gates are formed in the positions, located between the main pouring gate and the pouring grooves, of the surface of the lower mold; the upper mold is provided with a material guide groove which penetrates through the upper surface and the lower surface of the upper mold and is located above the main pouring gate, a sliding groove is formed in the inner wall of the side, connected to the branch pouring gate, of the pouring groove, a cutting piece is slidably connected into the sliding groove in the vertical direction, and a plurality of cooling flow grooves are formed in the lower mold and the upper mold; and the driving assembly is used for driving the cutting piece to slide. The invention aims to provide the injection mold capable of automatically cutting off the water gap in the mold.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and more specifically, to an injection mold with an in-mold automatic gate removal function. Background Technology

[0002] In injection molding, molten plastic fills the mold cavity through the mold's runner system, and after cooling and solidification, forms a plastic product. The part connecting the product to the main runner is called the "sprue." Before or after demolding, the sprue must be separated from the finished product to obtain a clean final product.

[0003] Currently, this operation generally relies on manual cutting or mechanical equipment for cutting. Regardless of the method, it increases additional working hours, costs, and the risk of failure, becoming a key bottleneck restricting production efficiency and cost control.

[0004] Therefore, a new solution is needed to address this problem. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an injection mold that automatically cuts off the sprue inside the mold.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an injection mold for automatically cutting out sprues in the mold, comprising a lower mold and an upper mold, wherein a main sprue is provided in the middle of the surface of the lower mold, and a plurality of gating grooves are provided on both sides of the main sprue on the surface of the lower mold, and a sub-sprue is provided between the main sprue and each gating groove on the surface of the lower mold, wherein a guide groove is provided through its upper and lower surfaces and located above the main sprue, and a sliding groove is provided on the inner wall of one side of the gating groove connected to the sub-sprue, wherein a cutting element is slidably connected in the sliding groove along the vertical direction, and a plurality of cooling channels are provided in the lower mold and the upper mold, and a driving component for driving the cutting element to slide is also included.

[0007] The present invention is further configured such that: the cutting component includes a sliding block that slides in a sliding groove, the top of the sliding block has a groove extending through both sides thereon, a lower cutting blade is provided in the groove on the side near the casting groove, a fixing block is provided on the inner surface of the sliding groove that is inserted into and slides in the groove, and when the top of the sliding block and the top of the lower mold are on the same horizontal plane, the sprue, the fixing block and the lower cutting blade form a through groove connecting the sprue and the casting groove.

[0008] The invention is further configured such that: limit grooves are formed on the inner walls of both sides of the sliding groove, and limit strips that slide within the limit grooves are provided on both sides of the sliding block. The present invention is further configured such that: the lower surface of the upper mold has a plurality of slots corresponding to the sliding blocks.

[0009] The present invention is further configured such that: a vertical sealing rod is provided in the slot, and the end of the sealing rod is inserted into the groove.

[0010] The invention is further configured such that: a pressure groove is provided below the sprue of the lower mold; the driving assembly includes a pressure plate disposed in the pressure groove; connecting rods are fixedly connected to both sides of the pressure plate; the ends of the connecting rods are fixedly connected to a sliding block; a sliding groove is provided between the pressure groove and the sliding groove for the connecting rods to slide along the vertical direction; and the driving assembly also includes a pressure flow channel for driving the pressure plate to rise and fall.

[0011] The present invention is further configured such that the pressure flow channel includes: A water inlet tank, which is connected to one end of the lower mold and to the bottom of the pressurization tank; A water outlet trough, which is connected to the other end of the lower mold and to the top of the other pressurizing trough; A flow guide channel is connected to two adjacent pressurizing channels, wherein the end of the water inlet channel and the outlet of each flow guide channel are located below the corresponding pressure plate; the end of the water outlet channel and the inlet of each flow guide channel are located above the initial position of the corresponding pressure plate. When a pressurized medium is introduced into the inlet, the pressure plate rises under pressure. Once it reaches the top position, the pressurized medium drives the pressure plates in the subsequent pressurization tanks to rise sequentially through the guide channels, ultimately forming a complete conductive path from the inlet tank through each guide channel to the outlet tank.

[0012] The present invention is further configured such that: a high-pressure water source system is connected to the end of the water inlet tank, the high-pressure water source system including a water hydraulic pump, a pressure control valve and an accumulator connected in sequence to the outlet of the water hydraulic pump.

[0013] In summary, the present invention has the following beneficial effects: When the injection mold is in operation, the drive device drives the upper mold and lower mold to close, and the feeding device feeds the molten plastic into the main runner of the lower mold through the guide channel of the upper mold (both the feeding device and the drive device are existing technologies and will not be described in detail in this embodiment). Then, the plastic fills the gating groove through each sub-gating channel to form the product and the sprue. Next, the cooling medium circulates in the cooling channel to accelerate the cooling and solidification of the plastic. After the cooling is complete, the drive assembly is activated to push all the cutting parts to slide upward and cut off the product and the sprue. Finally, the upper mold and lower mold separate, thereby integrating the sprue removal process into the injection molding cycle, eliminating the secondary processing step of separately removing the sprue, improving production efficiency, and saving labor and equipment costs. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of this embodiment; Figure 2This is a schematic diagram of the lower mold structure in this embodiment; Figure 3 This is a schematic diagram of the structure of the cutting component in this embodiment; Figure 4 This is a schematic diagram of the half-section structure of the lower mold in this embodiment; Figure 5 for Figure 4 A magnified view of part A in the middle; Figure 6 This is a schematic diagram of the bottom structure of the upper mold; Figure 7 for Figure 6 A magnified view of part B in the middle.

[0015] Figure descriptions: 1. Lower mold; 2. Upper mold; 3. Main runner; 4. Gating groove; 5. Sub-gating runner; 6. Guide groove; 7. Cutting part; 8. Cooling runner; 9. Sliding block; 10. Groove; 11. Lower cutting blade; 12. Fixing block; 13. Limiting strip; 14. Slot; 15. Sealing rod; 16. Upper cutting blade; 17. Pressure groove; 18. Pressure plate; 19. Connecting rod; 20. Water inlet groove; 21. Water outlet groove; 22. Guide groove. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings.

[0017] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific part, respectively.

[0018] As shown in the figure, an injection mold for automatically cutting out sprues in the mold includes a lower mold 1 and an upper mold 2. A main sprue 3 is provided in the middle of the surface of the lower mold 1. Several gating grooves 4 are provided on both sides of the main sprue 3 on the surface of the lower mold 1. A sub-sprue 5 is provided between the main sprue 3 and each gating groove 4 on the surface of the lower mold 1. A guide groove 6 is provided through its upper and lower surfaces and located above the main sprue 3. A sliding groove is provided on the inner wall of one side of the gating groove 4 connected to the sub-sprue 5. A cutting element 7 is slidably connected in the sliding groove along the vertical direction. Several cooling channels 8 are provided in the lower mold 1 and the upper mold 2. The mold also includes a drive assembly for driving the cutting element 7 to slide.

[0019] When the injection mold is in operation, the drive device drives the upper mold 2 and the lower mold 1 to close, and the molten plastic flows into the main runner 3 of the lower mold 1 through the guide channel 6 of the upper mold 2 via the feeding device (both the feeding device and the drive device are existing technologies and will not be described in detail in this embodiment). Then, it fills the gating groove 4 through each sub-gating channel 5 to form the product and the sprue. Next, the cooling medium circulates in the cooling channel to accelerate the cooling and solidification of the plastic. After the cooling is complete, the drive component is activated to push all the cutting parts 7 to slide upward to cut off the product and the sprue. Finally, the upper mold 2 and the lower mold 1 separate, thereby integrating the sprue removal process into the injection molding cycle, eliminating the secondary processing step of separately removing the sprue, improving production efficiency, and saving labor and equipment costs.

[0020] The cutting component 7 includes a sliding block 9 that slides in a sliding groove. The top of the sliding block 9 has a groove 10 that extends through both sides of its surface. A lower cutting blade 11 is provided in the groove 10 on the side closest to the casting groove 4. A fixing block 12 is provided on the inner surface of the sliding groove and is inserted into and slides in the groove 10. When the top of the sliding block 9 and the top of the lower mold 1 are on the same horizontal plane, the sprue 5, the fixing block 12 and the lower cutting blade 11 form a through groove that connects the sprue 5 and the casting groove 4.

[0021] The sliding block 9, the fixed block 12, and the lower cutting blade 11 together form a complete through groove when the mold is closed, ensuring the smooth filling of the melt during injection molding; when driven, the fixed block 12 serves as a support point, enabling the lower cutting blade 11 to accurately and stably cut off the sprue.

[0022] Limiting grooves are provided on the inner walls of both sides of the sliding groove, and limiting strips 13 are provided on both sides of the sliding block 9 to slide in the limiting grooves. The cooperation between the limiting strips 13 and the limiting grooves ensures that the sliding block 9 moves strictly in the vertical direction in the sliding groove, effectively preventing it from rotating or tilting during the movement.

[0023] The lower surface of the upper mold 2 has several slots 14 corresponding to the sliding block 9, allowing the sliding block 9 to slide upwards when the mold is closed. A vertical sealing rod 15 is provided in the slot 14, and the end of the sealing rod 15 is inserted into the groove 10. The sealing rod 15 can prevent molten plastic from entering the slot 14. The bottom end of the sealing rod 15 is provided with an upper cutting blade 16 that cooperates with the lower cutting blade 11. When the sliding block 9 rises, the lower cutting blade 11 and the upper cutting blade 16 are tangential, so as to smoothly cut the sprue.

[0024] The lower mold 1 is located below the sprue 5 and has a pressure groove 17. The drive assembly includes a pressure plate 18 horizontally disposed in the pressure groove 17, which isolates the pressure groove 17 into two sealed cavities. Connecting rods 19 are fixedly connected to both sides of the pressure plate 18, and the ends of the connecting rods 19 are fixedly connected to the sliding block 9. A sliding groove is provided between the pressure groove 17 and the sliding groove for the connecting rods 19 to slide in the vertical direction. The drive assembly also includes a pressure flow channel for driving the pressure plate 18 to rise and fall.

[0025] The pressure flow channel includes an inlet channel 20, an outlet channel 21, and a guide channel 22. The inlet channel 20 is connected to one end of the lower mold 1 and to the bottom of a pressure tank 17; the outlet channel 21 is connected to the other end of the lower mold 1 and to the top of another pressure tank 17; the guide channel 22 is connected to two adjacent pressure tanks 17. The end of the inlet channel 20 and the outlet of each guide channel 22 are located below the corresponding pressure plate 18; the end of the outlet channel 21 and the inlet of each guide channel 22 are located above the initial position of the corresponding pressure plate 18. When the pressure medium is introduced into the inlet, it can further cool the lower mold 1. The pressure plate 18 rises under pressure. After rising to the top position, the pressure medium drives the pressure plate 18 in the subsequent pressure tank 17 to rise through the guide groove 22. When the corresponding pressure tank 17 is filled, the product in the corresponding casting tank 4 is fully cooled and cut. Finally, a complete guide path is formed from the inlet tank 20 through each guide groove 22 to the outlet tank 21, completing the cutting work of all the gates.

[0026] The lower mold 1 is connected to a high-pressure water source system (not shown in the figure, and its connection and installation methods are all existing technologies, which will not be described in detail in this embodiment). The high-pressure water source system includes a hydraulic pump, a pressure control valve and an accumulator connected in sequence to the outlet of the hydraulic pump. The pressure control valve receives the injection pressure command signal from the computer and is controlled by the closed loop of the pressure controller to provide a real-time controllable high-pressure water flow to the water inlet tank 20.

[0027] The specific embodiments are merely illustrative of the present invention and are not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An injection mold for automatically cutting off sprue gates inside the mold, characterized in that: The mold includes a lower mold (1) and an upper mold (2). The lower mold (1) has a main sprue (3) in the middle of its surface. The lower mold (1) has several pouring grooves (4) on both sides of the main sprue (3). The lower mold (1) has sub-sprues (5) between the main sprue (3) and each pouring groove (4). The upper mold (2) has a guide groove (6) that runs through its upper and lower surfaces and is located above the main sprue (3). The pouring groove (4) is connected to the inner wall of one side of the sub-sprue (5) and has a sliding groove. A cutting part (7) is slidably connected in the sliding groove along the vertical direction. The lower mold (1) and the upper mold (2) have several cooling channels (8). The mold also includes a drive assembly for driving the cutting part (7) to slide.

2. The injection mold for automatically cutting off sprue gates inside the mold according to claim 1, characterized in that: The cutting component (7) includes a sliding block (9) that slides in a sliding groove. The top of the sliding block (9) has a groove (10) that extends through both sides of its surface. A lower cutting blade (11) is provided in the groove (10) on the side near the casting groove (4). A fixing block (12) is inserted into and slides in the groove (10) on the inner surface of the sliding groove. When the top of the sliding block (9) and the top of the lower mold (1) are on the same horizontal plane, the sprue (5), the fixing block (12) and the lower cutting blade (11) form a through groove that connects the sprue (5) and the casting groove (4).

3. The injection mold for automatically cutting off sprue gates inside the mold according to claim 2, characterized in that: Limiting grooves are provided on the inner walls of both sides of the sliding groove, and limiting strips (13) that slide in the limiting grooves are provided on both sides of the sliding block (9).

4. The injection mold for automatically cutting off sprue gates inside the mold according to claim 3, characterized in that: The lower surface of the upper mold (2) is provided with a number of slots (14) corresponding to the sliding block (9).

5. The injection mold for automatically cutting off sprue gates inside the mold according to claim 4, characterized in that: A vertical sealing rod (15) is provided in the slot (14), and the end of the sealing rod (15) is inserted into the groove (10).

6. The injection mold for automatically cutting off sprue gates inside the mold according to claim 5, characterized in that: The lower mold (1) is provided with a pressure groove (17) below the sprue (5). The driving assembly includes a pressure plate (18) disposed in the pressure groove (17). Connecting rods (19) are fixedly connected to both sides of the pressure plate (18). The end of the connecting rod (19) is fixedly connected to the sliding block (9). A sliding groove is provided between the pressure groove (17) and the sliding groove for the connecting rod (19) to slide in the vertical direction. The driving assembly also includes a pressure flow channel for driving the pressure plate (18) to rise and fall.

7. An injection mold for automatically cutting off sprue gates inside the mold according to claim 6, characterized in that: The pressure flow channel includes: Water inlet tank (20), which is connected to one end of the lower mold (1) and to the bottom of the pressurizing tank (17); Water outlet trough (21), which is connected to the other end of the lower mold (1) and to the top of the other pressurizing trough (17); The guide channel (22) is connected to two adjacent pressurizing channels (17), wherein the end of the water inlet channel (20) and the outlet of each guide channel (22) are located below the corresponding pressure plate (18); the end of the water outlet channel (21) and the inlet of each guide channel (22) are located above the initial position of the corresponding pressure plate (18); When the pressure medium is introduced into the inlet, the pressure plate (18) rises under pressure. After rising to the top position, the pressure medium drives the pressure plate (18) in the subsequent pressurization tank (17) to rise through the guide channel (22), and finally forms a complete conductive path from the inlet tank (20) through each guide channel (22) to the outlet tank (21).

8. The injection mold for automatically cutting off sprue gates inside the mold according to claim 7, characterized in that: The lower mold (1) is connected to a high-pressure water source system at the end of the water inlet tank (20). The high-pressure water source system includes a water hydraulic pump, a pressure control valve and an accumulator connected in sequence to the outlet of the water hydraulic pump.

Images