Cavity forevacuum mold and device thereof

Abstract

The utility model discloses a cavity forevacuum mold and a device thereof, and relates to the technical field of molds. The lower mold is provided with a main injection molding channel, an auxiliary injection molding channel communicating with the main injection molding channel, a plurality of branch injection molding channels communicating with the auxiliary injection molding channel, a plurality of injection molding holes communicating with the branch injection molding channels and a plurality of first molding grooves communicating with the injection molding holes, the branch injection molding channels correspond to the injection molding holes one to one, and the injection molding holes correspond to the first molding grooves one to one; the lower mold is used for covering the auxiliary injection molding channels and the branch injection molding channels, a plurality of second forming grooves are formed in the lower mold, the second forming grooves and the first forming grooves define forming cavities, the lower mold is provided with air exhaust channels communicated with the auxiliary injection molding channels, the lower mold is connected with a control assembly, and the control assembly is used for controlling on-off of the air exhaust channels. Air in the forming cavity is pumped out through the external air pump, the situation that the air is compressed on the circumferential side wall of the formed wheel core to form a black focus is avoided, and the forming effect of the wheel core is improved.

Description

Technical Field

[0001] This application relates to the technical field of molds, and in particular to a cavity pre-vacuum mold and its apparatus. Background Technology

[0002] A mold is a specialized tool used in industrial production to shape articles. It is a device that uses a cavity of a specific shape to give material the required shape and size. In a mold used to produce wheel cores, the upper and lower molds are closed, and the injection liquid enters from the main injection channel into the secondary injection channel, and then enters the cavity through the injection holes of the branch injection channel. After cooling, the upper and lower molds separate for demolding.

[0003] Because air may be present in the mold cavity, during the injection molding process, the air will be compressed at the other end opposite the injection hole, that is, on the circumferential side wall of the molded wheel core. When the air is compressed to the extreme, it will form black focal points on the wheel core, affecting the molding effect of the wheel core, which needs to be improved. Utility Model Content

[0004] The purpose of this application is to provide a cavity pre-vacuum mold and its device to improve the forming effect of wheel core.

[0005] The pre-vacuum mold and its device for a cavity provided in this application adopt the following technical solution:

[0006] The device includes an upper mold and a lower mold. The lower mold has a main injection channel, a secondary injection channel communicating with the main injection channel, several support injection channels communicating with the secondary injection channels, several injection holes communicating with the support injection channels, and several first molding grooves communicating with the injection holes. Each support injection channel corresponds to one injection hole, and each injection hole corresponds to one first molding groove. The lower mold covers the secondary injection channels and the support injection channels. The lower mold also has several second molding grooves, each corresponding to one first molding groove. The second molding grooves and the first molding grooves together form a molding cavity. The lower mold has an extraction channel communicating with the secondary injection channels. A control component is connected to the upper mold and the lower mold to control the opening and closing of the extraction channel.

[0007] By adopting the above technical solution, after the upper and lower molds are closed, the control component opens the air extraction channel and uses an external air pump to extract the air from the molding cavity. After extraction, the air pump is turned off, and the control component closes the air extraction channel, reducing the amount of air in the molding cavity and preventing air from being compressed onto the circumferential sidewalls of the molding core to form black focal points, thus improving the molding effect of the core.

[0008] Optionally, the control component includes a sealing rod slidably connected within the lower mold and a driving member connected to the lower mold. The driving member is used to drive the sealing rod to slide towards or away from the air extraction channel. The lower mold is provided with a groove communicating with the air extraction channel, and the groove is used to slide and engage with the sealing rod.

[0009] By adopting the above technical solution, the driving component drives the sealing rod to slide towards the direction of the air extraction channel, and one end of the sealing rod moves to the connection between the slide groove and the air extraction channel, thus sealing the air extraction channel; the driving component drives the sealing rod to slide away from the air extraction channel, the sealing rod separates from the air extraction channel, and the air extraction channel is opened, thereby realizing the opening and closing of the air extraction channel.

[0010] Optionally, the lower mold is provided with a relief groove that communicates with the air extraction channel. The air extraction channel is located between the relief groove and the sliding groove. The relief groove is used for one end of the sealing rod to be engaged.

[0011] By adopting the above technical solution, one end of the sealing rod can be inserted into the clearance groove, thereby achieving precise sealing control of the air extraction channel and improving the sealing effect.

[0012] Optionally, a sealing ring is fitted on one end of the sealing rod near the clearance groove. When one end of the sealing rod is inserted into the clearance groove, the sealing ring is located at the connection between the air extraction channel and the slide groove. The sealing ring is used to seal the gap between the air extraction channel and the sealing rod.

[0013] By adopting the above technical solution, the sealing ring seals the gap between the air extraction channel and the sealing rod, thereby improving the sealing effect.

[0014] Optionally, the radius of the main injection channel gradually increases towards the secondary injection channel.

[0015] By adopting the above technical solution, the flow rate of the liquid can be slowed down, making it easier for the liquid to flow into the secondary injection channel.

[0016] Optionally, the lower mold is provided with two buffer grooves, both of which are connected to the secondary injection channel. The two buffer grooves are located at the two ends of the secondary injection channel, and the connection between each secondary injection channel and the secondary injection channel is located between the two buffer grooves.

[0017] By adopting the above technical solution, the buffer grooves set at both ends of the secondary injection channel can buffer the liquid, prevent the liquid flow rate from being too fast, and facilitate the liquid to flow into the secondary injection channel better.

[0018] Optionally, the lower mold is provided with a storage tank communicating with the secondary injection channel, and the storage tank is located at the connection between the secondary injection channel and the secondary injection channel.

[0019] By adopting the above technical solution, when the amount of injection molding liquid is too large, the liquid will flow into the storage tank, avoiding excessive pressure in the molding cavity caused by excessive liquid.

[0020] Optionally, the radius of the injection hole decreases gradually towards the direction of the first molding groove.

[0021] By adopting the above technical solution, the flow rate of the liquid before entering the molding cavity can be accelerated, which helps the liquid to fill the molding cavity more quickly, avoids the molding problem caused by slow flow rate, and improves the molding effect of the wheel core.

[0022] Optionally, the injection hole is inclined and extends toward the end near the first molding groove in a direction away from the upper mold.

[0023] By adopting the above technical solution, the liquid is injected into the molding cavity from the lower side, and the liquid fills the molding cavity from bottom to top, reducing the splashing of liquid in the molding cavity and improving the molding effect of the wheel core.

[0024] An apparatus includes a cavity pre-vacuum mold, a lower mold connected to an extraction pipe communicating with an extraction channel, the extraction pipe being connected to a negative pressure air box, a valve and an air pump, the negative pressure air box being located between the lower mold and the valve, the valve being located between the negative pressure air box and the air pump, the lower mold being connected to an injection pipe communicating with a main injection channel, and the injection pipe being connected to a liquid pump.

[0025] By adopting the above technical solution, after the upper and lower molds are closed, the control component can control the opening of the evacuation channel. During evacuation, a negative pressure is generated in the evacuation pipe by an air pump. The negative pressure air box can store a certain negative pressure value. Opening the valve can extract the air in the molding cavity through the evacuation channel, avoiding the air being compressed in the molding cavity during the molding process, which would cause poor wheel core molding effect. After evacuation, the control component controls the sealing of the evacuation channel. The liquid pump can continuously and stably supply injection liquid. The liquid pump is used to inject the injection liquid into the main injection channel through the injection pipe, and then into the molding cavity through the injection hole via the secondary injection channel and the branch injection channel, ensuring the smooth progress of the injection molding process.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. After the upper and lower molds are closed, the control component opens the air extraction channel and uses an external air pump to extract the air from the molding cavity. After extraction, the air pump is turned off, and the control component closes the air extraction channel, reducing the amount of air in the molding cavity and preventing air from being compressed onto the circumferential sidewalls of the molding core to form black focal points, thus improving the molding effect of the core.

[0028] 2. One end of the sealing rod can be inserted into the clearance groove to achieve precise sealing control of the air extraction channel and improve the sealing effect. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0030] Figure 2 This is a cross-sectional view of an embodiment of this application.

[0031] Figure 3 yes Figure 2 An enlarged view of region A.

[0032] Figure 4 This is a partial structural schematic diagram of an embodiment of this application.

[0033] Figure 5 yes Figure 4 A magnified view of region B.

[0034] Explanation of reference numerals in the attached drawings: 1. Upper mold; 2. Lower mold; 21. Main injection channel; 22. Secondary injection channel; 23. Buffer groove; 24. Air extraction channel; 241. Vertical channel; 242. Horizontal channel; 25. Slide groove; 26. Clearance groove; 27. Support injection channel; 28. Injection hole; 29. ​​First molding groove; 20. Material storage tank; 3. Control component; 31. Sealing rod; 32. Drive component. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail.

[0036] This application discloses a cavity pre-vacuum mold and its device.

[0037] A cavity pre-vacuum mold

[0038] Combination Figure 1 , Figure 2 and Figure 3 As shown, the system includes an upper mold 1 and a lower mold 2. The lower mold 2 has a main injection channel 21 and a secondary injection channel 22 connected to the main injection channel 21. The extension direction of the main injection channel 21 is perpendicular to the extension direction of the secondary injection channel 22. The distance from the connection point of the main injection channel 21 and the secondary injection channel 22 to both ends of the secondary injection channel 22 is equal. The radius of the main injection channel 21 gradually increases towards the secondary injection channel 22. The lower mold 2 has two buffer grooves 23, both of which are connected to the secondary injection channel 22. The two buffer grooves 23 are located at both ends of the secondary injection channel 22, and the secondary injection channel 22 and the main injection channel 21 are located between the two buffer grooves 23. The extension direction of the buffer grooves 23 is the same as the extension direction of the secondary injection channel 22.

[0039] Combination Figure 2 and Figure 3 As shown, the lower mold 2 has an L-shaped suction channel 24. The suction channel 24 includes a vertical channel 241 communicating with one of the buffer grooves 23 and a horizontal channel 242 communicating with the vertical channel 241. The extension direction of the horizontal channel 242 is perpendicular to the extension direction of the vertical channel 241, and the extension direction of the vertical channel 241 is perpendicular to the extension direction of the secondary injection channel 22. The lower mold 2 is connected to a control component 3, which is used to control the opening and closing of the vertical channel 241. The control component 3 includes a sealing rod 31 slidably connected inside the lower mold 2 and a drive component 32 fixedly connected to the lower mold 2. The drive component 32 is a cylinder, and a controller (not shown in the figure) is externally connected to the drive component 32. The signal output terminal of the controller is connected to the signal input terminal of the drive component 32, and the end of the sealing rod 31 near the drive component 32 is fixedly connected to the output terminal of the drive component 32. Through the drive component 32, the sealing rod 31 slides towards or away from the vertical channel 241. The lower mold 2 has a sliding groove 25 and a clearance groove 26 connected by an air extraction channel 24. The sealing rod 31 slides and engages with the sliding groove 25. The end of the sealing rod 31 away from the driving member 32 can be inserted into the clearance groove 26. The vertical channel 241 is located between the clearance groove 26 and the sliding groove 25. The extension direction of the clearance groove 26 is the same as the extension direction of the sliding groove 25, and the extension direction of the sliding groove 25 is perpendicular to the extension direction of the vertical channel 241. A sealing ring (not shown in the attached figure) is fixedly connected to the outer surface of the sealing rod 31. The sealing ring is located at the end of the sealing rod 31 away from the driving member 32. When one end of the sealing rod 31 is inserted into the clearance groove 26, the sealing ring is located at the connection between the air extraction channel 24 and the sliding groove 25, and the sealing ring seals the gap between the air extraction channel 24 and the sealing rod 31.

[0040] Combination Figure 4 and Figure 5As shown, the lower mold 2 has several supporting injection channels 27 connected to the secondary injection channel 22, several injection holes 28 connected to the supporting injection channels 27, and several first molding grooves 29 connected to the injection holes 28. In this embodiment, the number of supporting injection channels 27, the number of injection holes 28, and the number of first molding grooves 29 are all eight. The supporting injection channels 27 correspond one-to-one with the injection holes 28, and the injection holes 28 correspond one-to-one with the first molding grooves 29. The upper mold 1 has several second molding grooves (not shown in the attached figure). In this embodiment, there are eight second molding grooves. The first molding grooves 29 correspond one-to-one with the second molding grooves. The first molding grooves 29 and the second molding grooves form a molding cavity. When the upper mold 1 is closed on the lower mold 2, the lower mold 2 covers the secondary injection channel 22 and the supporting injection channels 27. The connection between each auxiliary injection channel 27 and the secondary injection channel 22 is located between two buffer grooves 23. The injection holes 28 are inclined and extend away from the upper mold 1 towards the end closer to the first molding groove 29. The radius of the injection holes 28 gradually decreases towards the first molding groove 29. The lower mold 2 has two storage grooves 20 that communicate with the secondary injection channels 22. One storage groove 20 communicates with the four auxiliary injection channels 27 and is located at the connection between the secondary injection channels 22 and the auxiliary injection channels 27.

[0041] An apparatus includes a cavity pre-vacuum mold. A lower mold 2 is fixedly connected to a vacuum extraction pipe (not shown in the attached drawing) communicating with a transverse channel 242 and a liquid injection pipe (not shown in the attached drawing) communicating with a main injection channel 21. The vacuum extraction pipe is fixedly connected to a negative pressure gas box (not shown in the attached drawing), a valve (not shown in the attached drawing), and an air pump (not shown in the attached drawing). The gas box is located between the valve and the transverse channel 242, and the valve is located between the negative pressure gas box and the air pump. The liquid injection pipe is fixedly connected to a liquid pump (not shown in the attached drawing). The valve, air pump, and liquid pump are all electrically connected to a controller. A gas flow sensor (not shown in the attached drawing) is fixedly connected to the vacuum extraction pipe and is located between the valve and the air pump. A liquid flow sensor (not shown in the attached drawing) is fixedly connected to the liquid injection pipe and is located between the liquid pump and the main injection channel 21.

[0042] The implementation principle of the cavity pre-vacuum mold and its device in this application embodiment is as follows:

[0043] After the upper mold 1 and lower mold 2 are closed, the driving component 32 drives the sealing rod 31 to slide away from the vertical channel 241, opening the vertical channel 241 and opening the valve. The air pump then extracts air from the molding cavity. After extraction, the air pump and valve are closed, and the driving component 32 drives the sealing rod 31 to slide closer to the vertical channel 241, closing the vertical channel 241. This reduces the amount of air in the molding cavity, preventing air from being compressed onto the circumferential sidewalls of the molding core and forming black focal points, thus improving the molding effect of the core.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pre-vacuum mold for a cavity, comprising an upper mold (1) and a lower mold (2), wherein the lower mold (2) is provided with a main injection channel (21), a secondary injection channel (22) communicating with the main injection channel (21), a plurality of supporting injection channels (27) communicating with the secondary injection channels (22), a plurality of injection holes (28) communicating with the supporting injection channels (27), and a plurality of first molding grooves (29) communicating with the injection holes (28), wherein the supporting injection channels (27) correspond one-to-one with the injection holes (28), and the injection holes (28) correspond one-to-one with the first molding grooves (29), wherein the lower mold (2) is used to cover the secondary injection channels (22) and the supporting injection channels (27), wherein the lower mold (2) is provided with a plurality of second molding grooves, wherein the second molding grooves correspond one-to-one with the first molding grooves (29), and the second molding grooves and the first molding grooves (29) form a molding cavity, characterized in that: The lower mold (2) is provided with an air extraction channel (24) that communicates with the secondary injection channel (22). The lower mold (2) is connected to a control component (3), which is used to control the opening and closing of the air extraction channel (24).

2. The cavity pre-vacuum mold according to claim 1, characterized in that: The control component (3) includes a sealing rod (31) slidably connected in the lower mold (2) and a drive member (32) connected to the lower mold (2). The drive member (32) is used to drive the sealing rod (31) to slide towards or away from the air extraction channel (24). The lower mold (2) is provided with a groove (25) communicating with the air extraction channel (24). The groove (25) is used to slide and cooperate with the sealing rod (31).

3. The cavity pre-vacuum mold according to claim 2, characterized in that: The lower mold (2) is provided with a relief groove (26) that communicates with the air extraction channel (24). The air extraction channel (24) is located between the relief groove (26) and the slide groove (25). The relief groove (26) is used to engage one end of the sealing rod (31).

4. The cavity pre-vacuum mold according to claim 3, characterized in that: A sealing ring is fitted on one end of the sealing rod (31) near the relief groove (26). When one end of the sealing rod (31) is inserted into the relief groove (26), the sealing ring is located at the connection between the air extraction channel (24) and the slide groove (25). The sealing ring is used to seal the gap between the air extraction channel (24) and the sealing rod (31).

5. The cavity pre-vacuum mold according to claim 1, characterized in that: The radius of the main injection channel (21) gradually increases toward the secondary injection channel (22).

6. The cavity pre-vacuum mold according to claim 1, characterized in that: The lower mold (2) is provided with two buffer grooves (23) that are both connected to the secondary injection channel (22). The two buffer grooves (23) are located at the two ends of the secondary injection channel (22), and the connection between each support injection channel (27) and the secondary injection channel (22) is located between the two buffer grooves (23).

7. The cavity pre-vacuum mold according to claim 1, characterized in that: The lower mold (2) is provided with a storage tank (20) that communicates with the secondary injection channel (22). The storage tank (20) is located at the connection between the secondary injection channel (22) and the support injection channel (27).

8. The cavity pre-vacuum mold according to claim 1, characterized in that: The radius of the injection hole (28) gradually decreases toward the first molding groove (29).

9. The cavity pre-vacuum mold according to claim 1, characterized in that: The injection hole (28) is inclined and extends toward the end near the first molding groove (29) in a direction away from the upper mold (1).

10. An apparatus comprising a cavity pre-vacuum mold as described in any one of claims 1-9, characterized in that: The lower mold (2) is connected to an air extraction pipe that communicates with the air extraction channel (24). The air extraction pipe is connected to a negative pressure air box, a valve, and an air pump. The negative pressure air box is located between the lower mold (2) and the valve. The valve is located between the negative pressure air box and the air pump. The lower mold (2) is connected to an injection pipe that communicates with the main injection channel (21). The injection pipe is connected to a liquid pump.

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