Plastic water auxiliary hollow beam injection mold and processing method

Abstract

The application discloses a full-plastic water-assisted hollow cross beam injection mold and a processing method. The full-plastic water-assisted hollow cross beam injection mold comprises a mold set with a mold cavity, a pump body, a spray pipe and a punch. The spray pipe comprises an inlet end and a nozzle end, and the nozzle end is opposite to one end of a workpiece in the mold cavity which needs to be processed. The punch is installed on the nozzle end. The pump body is used for filling liquid or gas into the spray pipe to push the punch into the workpiece in the mold cavity and process a hole body in the workpiece. After the mold set is used to form the workpiece in the mold cavity, the punch is driven into the workpiece in the mold cavity by the pump body combined with the spray pipe. Since the outside of the workpiece is cooled earlier than the inside, when the outside of the workpiece is formed, the inside is still in a hot melt state, so that the punch which is shot into the workpiece can punch out the hole body in the workpiece, thereby processing the workpiece with a hollow structure directly in the mold set. The application further provides a processing method of the full-plastic water-assisted hollow cross beam.

Description

Technical Field

[0001] This invention relates to the technical field of injection molds, and more specifically to an all-plastic water-assisted hollow beam injection mold and its processing method. Background Technology

[0002] In the automotive parts industry, the dashboard crossbeam is an important load-bearing component. It connects the front bulkhead, side bulkhead, and floor, and is used to support related components such as airbags and electrical components, as well as to support and position the dashboard as a whole.

[0003] In recent years, driven by the desire to reduce energy consumption and increase driving range, the industry has increasingly demanded lighter vehicles. Due to its long shape and significant weight, the dashboard crossbeam has become a key research focus for improving overall vehicle lightweighting. Specifically, in terms of materials, dashboard crossbeams are gradually shifting from traditional all-steel to a combination of steel and plastic or all-plastic construction. Structurally, dashboard crossbeams are transitioning from solid to hollow structures.

[0004] Currently, the industry commonly uses a semi-steel, semi-plastic instrument panel crossbeam. During production, a hollow steel insert is typically placed into a mold before injection molding. While this method achieves a hollow structure, it has several significant drawbacks: First, limited weight reduction: the density of the hollow steel insert is much greater than that of plastic, resulting in a relatively high overall weight that fails to meet increasingly stringent lightweighting requirements. Second, low production efficiency: during injection molding, each mold requires manual or robotic pre-positioning of the hollow steel insert into the mold cavity. This process not only increases the production cycle time per piece but also easily leads to defective products due to improper placement, severely hindering batch production efficiency and the balance of automated production lines. Third, poor steel-plastic bonding and high scrap rate: the hollow steel insert and plastic are dissimilar materials with significantly different coefficients of thermal expansion. During injection molding and cooling, internal stress or even delamination can easily occur at the bonding interface, resulting in a high scrap rate.

[0005] To address the aforementioned issues, some dashboard crossbeams are now being made entirely of plastic. However, referencing... Figure 3 As shown, Figure 3 The right half is a typical dashboard crossbeam. As you can see, the dashboard crossbeam is relatively long and has some curved sections. Considering demolding issues, a fully plastic dashboard crossbeam in traditional molds can only be a solid structure, limiting its lightweight properties. To produce a hollow, fully plastic dashboard crossbeam, holes must be drilled inside the plastic material after the dashboard crossbeam is injection molded to create the hollow structure. This obviously adds an extra step and restricts production efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide an injection mold for efficiently producing all-plastic water-assisted hollow crossbeams with a hollow structure, and a processing method for all-plastic water-assisted hollow crossbeams.

[0007] To address the aforementioned problems, this invention provides an all-plastic water-assisted hollow beam injection mold, comprising a mold assembly with a cavity, a pump body, a nozzle, and a punch. The nozzle includes an inlet end connected to the pump body and a nozzle end extending into the cavity, with the nozzle end facing the end of the workpiece in the cavity where a hole needs to be machined. The punch is mounted on the nozzle end. The pump body is used to fill the nozzle with liquid or gas to push the punch into the workpiece from the end where a hole needs to be machined, thereby machining a hole inside the workpiece.

[0008] In the above solution, after the workpiece is formed by injection molding within the mold cavity, a pump combined with a nozzle drives a punch to inject the workpiece into the cavity. Since the exterior of the workpiece cools before the interior, the interior remains molten while the exterior is being formed. This allows the punch to extrude a hole within the workpiece, creating a hollow structure. Compared to existing technologies where all-plastic crossbeams require injection molding followed by drilling, this solution allows for the processing of the hollow structure during the cooling process of injection molding, eliminating the need for subsequent drilling and significantly improving production efficiency. Furthermore, compared to existing technologies where semi-steel, semi-plastic crossbeams require pre-insertion of hollow steel inserts before injection molding, this solution eliminates the need for any insert placement, produces consistent workpieces, achieves high processing efficiency, and further reduces overall weight, better meeting the requirements for automotive lightweighting.

[0009] In an improved embodiment, a return pipe is also included, comprising a return end connected to the nozzle and an outlet end connected to the pump body. The pump body draws liquid or gas from the nozzle through the return pipe. When the pump body fills the nozzle with liquid or gas, the pump body is closed relative to the outlet end of the return pipe. When the pump body draws liquid or gas from the nozzle through the return pipe, the pump body is closed relative to the inlet end of the nozzle. Thus, after the punch completes the hole machining inside the workpiece, the liquid or gas in the nozzle and the hole can be drawn out through the return pipe, reducing liquid or gas residue.

[0010] In an improved embodiment, the pump body is a liquid pump used to fill the nozzle with liquid or extract liquid through the return pipe. Using liquid as the propellant allows for greater pressure, thus propelling the punch forward more smoothly and controllably. Simultaneously, the liquid also provides lubrication and cooling between the punch and the workpiece, which is beneficial for improving the quality of the inner wall of the bore.

[0011] In an improved embodiment, the punch has a pointed, conical shape on the side facing the workpiece, and an insertion hole at the end of the punch facing the nozzle. The punch is fitted onto the nozzle end of the nozzle through the insertion hole. The pointed, conical design reduces the resistance when the punch enters the workpiece, making it easier to penetrate the molten workpiece. The insertion hole allows the punch to be accurately and quickly installed onto the nozzle end of the nozzle, ensuring that the nozzle end of the nozzle can better eject the punch into the workpiece.

[0012] In an improved embodiment, the mold assembly is provided with a hot melt injection port communicating with the cavity. The hot melt injection port is located at the other end of the workpiece in the cavity where the hole to be machined needs to be located, so that when the punch is injected from one end of the workpiece, the molten material extruded by the punch can flow out from the other end of the workpiece and be discharged to the hot melt injection port.

[0013] A method for processing an all-plastic water-assisted hollow crossbeam includes the following steps: S1. Configure a mold assembly with cavities, the cavities corresponding to the shape of the workpiece; S2. Configure a pump body, a nozzle, and a punch, wherein the nozzle includes an inlet end connected to the pump body and a nozzle end extending into the cavity, and the nozzle end is directly opposite the end of the workpiece in the cavity where the hole to be machined needs to be located, and the punch is installed on the nozzle end of the nozzle. S3. Inject raw material into the cavity of the mold assembly to form a workpiece, and then wait for the workpiece to cool. When the outside of the workpiece has cooled and formed while the inside is still molten, inject liquid or gas into the nozzle through the pump body, so that the punch can be injected into the workpiece and process a hole inside the workpiece.

[0014] The above method utilizes the principle that the exterior of the workpiece cools first, while the interior cools later. When the workpiece is in a state where the exterior has cooled and solidified while the interior is still molten, a pump and nozzle are used to inject a punch into the workpiece. At this time, the molten material inside the workpiece is pushed apart to form a hole structure. Simultaneously, because the exterior of the workpiece has cooled and solidified, the punch can be guided forward according to the shape of the workpiece until the hole is completely machined inside, resulting in a hollow structure inside the workpiece. Compared to the existing technology of producing all-plastic crossbeams that requires injection molding followed by drilling, this solution can achieve the processing of the hollow structure inside the workpiece during the cooling process of injection molding, eliminating the subsequent drilling process and significantly improving production efficiency. Compared to the existing technology of producing semi-steel, semi-plastic crossbeams that requires the pre-placement of hollow steel inserts before injection molding, this solution eliminates any insert placement step, and the processed workpieces have good consistency, high processing efficiency, and further reduced overall weight, better meeting the requirements of automotive lightweighting.

[0015] In an improved embodiment, in step S2, a return pipe is further configured, which includes a return end connected to the nozzle and an outlet end connected to the pump body; in step S3, after the punch enters the workpiece and processes a hole inside the workpiece, the pump body extracts the liquid or gas in the nozzle and the workpiece hole through the return pipe, so that after processing, the liquid or gas in the nozzle and the hole can be extracted through the return pipe, thereby reducing liquid or gas residue.

[0016] In an improved design, the mold assembly is equipped with a hot-melt injection port connected to the cavity. This port is located at the other end of the workpiece within the cavity where a hole needs to be machined. In step S3, raw material is injected into the cavity of the mold assembly through the hot-melt injection port to form the workpiece. When the punch enters the workpiece and machines a hole inside, the raw material extruded by the punch returns to the hot-melt injection port. During the next injection, it is reheated to a molten state within the hot-melt injection port and enters the cavity with the next batch of raw material. This design prevents the extruded material from being wasted; instead, it is recycled through the hot-melt injection port, saving raw material costs and avoiding the impact of extruded material accumulation on mold opening and closing. Attached Figure Description

[0017] Figure 1 A schematic diagram of the cross-section of a water-assisted hollow beam injection mold; Figure 2 A schematic diagram of the pump body, nozzle, and return pipe of an all-plastic water-assisted hollow beam injection mold; Figure 3 This is a schematic diagram showing the combination of the workpiece and the nozzle in a fully plastic water-assisted hollow beam injection mold.

[0018] Explanation of reference numerals in the attached figures: 1. Mold assembly; 11. Cavity; 12. Injection port; 2. Pump body; 3. Nozzle; 31. Inlet end; 32. Nozzle end; 4. Punch; 41. Insertion hole; 5. Return pipe; 51. Return end; 52. Outlet end. Detailed Implementation

[0019] It should be understood by those skilled in the art that the following embodiments are merely illustrative of the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0020] In the following description of the embodiments, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0021] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] Example 1: Please refer to Figures 1-3 Embodiment 1 of the present invention provides an all-plastic water-assisted hollow beam injection mold, including a mold assembly 1 with a cavity 11, and also includes a pump body 2, a nozzle 3 and a punch 4. The nozzle 3 includes an inlet end 31 connected to the pump body 2 and a nozzle end 32 extending into the cavity 11, and the nozzle end 32 is directly opposite one end of the workpiece in the cavity 11 where a hole needs to be machined. The punch 4 is installed on the nozzle end 32. The pump body 2 is used to fill the nozzle 3 with liquid or gas to push the punch 4 to be injected from one end of the workpiece where a hole needs to be machined, thereby machining a hole inside the workpiece.

[0024] Mold assembly 1 typically includes a moving mold and a fixed mold. The moving mold opens and closes by moving closer to or further away from the fixed mold. This part is prior art and will not be described in detail here. Cavity 11 is formed by the moving mold and the fixed mold. The fixed mold is usually provided with an injection port 12. Molten raw material is injected into cavity 11 through injection port 12. After the raw material cools and solidifies, the workpiece is formed in cavity 11.

[0025] In this solution, after the mold assembly 1 forms the workpiece through injection molding in the cavity 11, the pump body 2, combined with the nozzle 3, drives the punch 4 to inject into the workpiece. Since the outside of the workpiece cools before the inside, the inside remains molten while the outside is being formed. This allows the punch 4, which injects into the workpiece, to squeeze the molten material inside, creating a hole and forming a hollow structure. Compared to the existing production method of injection molding and drilling for all-plastic crossbeams, this solution allows for the processing of the hollow structure inside the workpiece during the cooling process of injection molding, eliminating the subsequent drilling step and significantly improving production efficiency. Compared to the existing production method of pre-placing hollow steel inserts before injection molding for semi-steel, semi-plastic crossbeams, this solution eliminates the need for any insert placement step, produces workpieces with good consistency, high processing efficiency, and further reduces the overall weight, better meeting the requirements of automotive lightweighting.

[0026] As a preferred embodiment, a return pipe 5 is also included. The return pipe 5 includes a return end 51 connected to the nozzle 3 and an outlet end 52 connected to the pump body 2. The pump body 2 draws liquid or gas from the nozzle 3 through the return pipe 5. When the pump body 2 fills the nozzle 3 with liquid or gas, the pump body 2 is closed relative to the outlet end 52 of the return pipe 5. When the pump body 2 draws gas or liquid from the nozzle 3 through the return pipe 5, the pump body 2 is closed relative to the inlet end 31 of the nozzle 3. Thus, after the punch 4 enters the workpiece to complete the hole machining, the liquid or gas in the nozzle 3 and the hole can be drawn out through the return pipe 5, reducing liquid or gas residue.

[0027] In this embodiment, the pump body 2 is preferably a liquid pump, used to fill the nozzle 3 with liquid or extract liquid through the return pipe 5. Specifically, when the punch 4 needs to be injected into the workpiece, the pump body 2 pumps liquid into the nozzle 3, thereby driving the punch 4 to be ejected. At this time, the pump body 2 and the return pipe 5 are in a closed state. When the punch 4 has reached the required ejection distance, the pump body 2 stops pumping liquid into the nozzle 3 and extracts liquid outward through the return pipe 5, so that the liquid in the workpiece hole returns to the nozzle 3 and is sucked out from the return pipe 5. This embodiment uses liquid as the driving medium to achieve greater pressure, thereby driving the punch 4 forward more smoothly and controllably. At the same time, the liquid can also play a lubricating and cooling role between the punch 4 and the workpiece, which is beneficial to improving the quality of the inner wall of the hole. It should be understood that by controlling the amount of liquid filled into the nozzle 3 by the pump body 2, the travel distance of the punch 4 can be controlled, so that the punch 4 can completely penetrate the workpiece or not, which can be set according to the design requirements. Of course, pump body 2 can also be any other device capable of supplying liquid to nozzle 3, which is an equivalent replacement for this solution.

[0028] In this embodiment, the side of the punch 4 facing the workpiece is tapered, and the end of the punch 4 facing the nozzle 3 is provided with an insertion hole 41. The punch 4 is fitted to the nozzle end 32 of the nozzle 3 through the insertion hole 41. The tapered design can reduce the resistance when the punch 4 enters the workpiece, making it easier to penetrate into the molten workpiece. The insertion hole 41 allows the punch 4 to be accurately and quickly installed onto the nozzle end 32 of the nozzle 3, ensuring that the nozzle end 32 of the nozzle 3 can better eject the punch 4 into the workpiece.

[0029] In this embodiment, the mold assembly 1 is provided with a hot melt injection port 12 communicating with the cavity 11. The hot melt injection port 12 is located at the other end of the workpiece in the cavity 11 where the hole to be machined needs to be located. Thus, when the punch 4 enters from one end of the workpiece, the molten material extruded by the punch 4 can flow out from the other end of the workpiece and be discharged to the hot melt injection port 12. It should be understood that the hot melt injection port 12 only needs to be located on one side of the cavity 11 corresponding to the other end of the workpiece where the hole to be machined needs to be located, and does not need to be completely opposite to the other end of the workpiece where the hole to be machined needs to be located. Of course, the effect of receiving molten material is best when the hot melt injection port 12 is directly opposite to the other end of the workpiece where the hole to be machined needs to be located.

[0030] Example 2: Example 2 of the present invention provides a processing method for an all-plastic water-assisted hollow crossbeam, comprising the following steps: S1. Configure mold assembly 1 with cavity 11, the cavity 11 corresponding to the shape of the workpiece; S2. Configure pump body 2, nozzle 3 and punch 4, wherein nozzle 3 includes an inlet end 31 connected to pump body 2 and a nozzle end 32 extending into cavity 11, and nozzle end 32 is directly opposite one end of the workpiece in cavity 11 where the hole to be machined needs to be located, and punch 4 is installed on nozzle end 32 of nozzle 3. S3. Inject raw material into the cavity 11 of mold group 1 to form a workpiece, and then wait for the workpiece to cool. When the outside of the workpiece has cooled and formed while the inside is still in a molten state, inject liquid or gas into the nozzle 3 through pump body 2, so that punch 4 is injected into the workpiece and a hole is machined inside the workpiece.

[0031] The above method utilizes the principle that the exterior of the workpiece cools first, while the interior cools later. When the workpiece is in a state where the exterior has cooled and solidified while the interior is still molten, the pump body 2, in conjunction with the nozzle 3, injects the punch 4 into the interior of the workpiece. At this time, the molten material inside the workpiece is pushed apart to form a hole structure. Simultaneously, because the exterior of the workpiece has cooled and solidified, the punch 4 can be guided forward according to the shape of the workpiece until the hole is completely machined inside. The hole maintains the same shape as the workpiece; it can be straight or curved according to the workpiece shape. Compared to the existing technology where all-plastic crossbeams require injection molding followed by drilling, this solution can achieve the processing of the hollow structure inside the workpiece during the cooling process of injection molding, eliminating the subsequent drilling process and significantly improving production efficiency. Furthermore, compared to the existing technology where semi-steel, semi-plastic crossbeams require pre-placement of hollow steel inserts before injection molding, this solution eliminates any insert placement step, produces workpieces with good consistency, high processing efficiency, and further reduces the overall weight, better meeting the requirements of automotive lightweighting. Example 3: Example 3 of the present invention provides a processing method for an all-plastic water-assisted hollow crossbeam, comprising the following steps: S1. Configure mold assembly 1 with cavity 11, the cavity 11 corresponding to the shape of the workpiece; S2. Configure pump body 2, nozzle 3, punch 4 and return pipe 5, wherein nozzle 3 includes an inlet end 31 connected to pump body 2 and a nozzle end 32 extending into cavity 11, and nozzle end 32 is directly opposite the end of the workpiece in cavity 11 where the hole to be machined needs to be located; punch 4 is installed on nozzle end 32 of nozzle 3; return pipe 5 includes a return end 51 connected to nozzle 3 and an outlet end 52 connected to pump body 2. S3. Inject raw material into the cavity 11 of mold assembly 1 to form a workpiece, and then wait for the workpiece to cool. When the outside of the workpiece has cooled and formed while the inside is still in a molten state, liquid or gas is injected into the nozzle 3 through pump body 2, so that punch 4 is injected into the workpiece and a hole is machined inside the workpiece. After punch 4 is injected into the workpiece and a hole is machined inside the workpiece, pump body 2 extracts the liquid or gas in nozzle 3 and workpiece hole through return pipe 5. Thus, after processing is completed, the liquid or gas in nozzle 3 and hole can be extracted through return pipe 5 to reduce liquid or gas residue.

[0032] Example 4: Example 4 of the present invention provides a processing method for an all-plastic water-assisted hollow crossbeam, comprising the following steps: S1. A mold assembly 1 is configured with a cavity 11 and a hot melt injection port 12, wherein the cavity 11 corresponds to the shape of the workpiece; S2. Configure pump body 2, nozzle 3, punch 4 and return pipe 5, wherein nozzle 3 includes an inlet end 31 connected to pump body 2 and a nozzle end 32 extending into cavity 11, and hot melt injection port 12 and nozzle end 32 are respectively located at both ends of the workpiece in cavity 11 where the hole to be processed is located, and punch 4 is installed on nozzle end 32 of nozzle 3; return pipe 5 includes return end 51 connected to nozzle 3 and outlet end 52 connected to pump body 2; S3. Raw material is injected into the cavity 11 of mold assembly 1 through hot melt injection port 12 to form a workpiece. Then, the workpiece is allowed to cool. When the outside of the workpiece has cooled and formed while the inside is still molten, liquid or gas is injected into the nozzle 3 through pump body 2, so that punch 4 is injected into the workpiece and a hole is machined inside the workpiece. The raw material squeezed out by punch 4 returns to hot melt injection port 12 and is reheated to a molten state in hot melt injection port 12 during the next injection and enters the cavity 11 with the next batch of raw material. After punch 4 is injected into the workpiece and a hole is machined inside the workpiece, pump body 2 extracts the liquid or gas in nozzle 3 and workpiece hole through return pipe 5. Thus, after processing, the liquid or gas in nozzle 3 and hole can be extracted through return pipe 5 to reduce liquid or gas residue.

[0033] It should be noted that in the description of this application, the terms "inner" and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application. All directional indications (such as up, down, left, right, front, back, inner, and outer) are only used to explain the relative positional relationships and movement between components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0034] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0035] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A water-assisted injection mold for a hollow crossbeam, comprising a mold assembly (1) having a cavity (11), characterized in that, It also includes a pump body (2), a nozzle (3) and a punch (4). The nozzle (3) includes an inlet end (31) connected to the pump body (2) and a nozzle end (32) extending into the cavity (11). The nozzle end (32) is directly opposite one end of the workpiece in the cavity (11) where a hole needs to be machined. The punch (4) is mounted on the nozzle end (32). The pump body (2) is used to fill the nozzle (3) with liquid or gas to push the punch (4) to be injected from one end of the workpiece where a hole needs to be machined, thereby machining a hole inside the workpiece.

2. The all-plastic water-assisted hollow crossbeam injection mold according to claim 1, characterized in that, It also includes a return pipe (5), which includes a return end (51) connected to the nozzle (3) and an outlet end (52) connected to the pump body (2). The pump body (2) draws liquid or gas from the nozzle (3) through the return pipe (5). When the pump body (2) fills the nozzle (3) with liquid or gas, the pump body (2) is closed relative to the outlet end (52) of the return pipe (5). When the pump body (2) draws liquid or gas from the nozzle (3) through the return pipe (5), the pump body (2) is closed relative to the inlet end (31) of the nozzle (3).

3. The all-plastic water-assisted hollow crossbeam injection mold according to claim 2, characterized in that, The pump body (2) is a liquid pump, which is used to fill the nozzle (3) with liquid or to extract liquid through the return pipe (5).

4. The all-plastic water-assisted hollow beam injection mold according to any one of claims 1-3, characterized in that, The punch (4) is cone-shaped on the side facing the workpiece. The end of the punch (4) facing the nozzle (3) is provided with a socket (41). The punch (4) is sleeved to the nozzle end (32) of the nozzle (3) through the socket (41).

5. The all-plastic water-assisted hollow beam injection mold according to any one of claims 1-3, characterized in that, The mold assembly (1) is provided with a hot melt injection port (12) that communicates with the cavity (11), and the hot melt injection port (12) is located at the other end of the workpiece in the cavity (11) where the hole to be processed needs to be located.

6. A method for processing an all-plastic water-assisted hollow crossbeam, characterized in that, Includes the following steps: S1. Configure a mold assembly (1) with a cavity (11) that corresponds to the shape of the workpiece; S2. Configure the pump body (2), nozzle (3) and punch (4), wherein the nozzle (3) includes an inlet end (31) connected to the pump body (2) and a nozzle end (32) extending into the cavity (11), and the nozzle end (32) is directly opposite to one end of the workpiece in the cavity (11) where the hole to be machined needs to be located, and the punch (4) is installed on the nozzle end (32) of the nozzle (3). S3. Inject raw materials into the cavity (11) of the mold group (1) to form a workpiece, and then wait for the workpiece to cool down. When the outside of the workpiece has cooled and formed while the inside is still in a molten state, inject liquid or gas into the nozzle (3) through the pump body (2) so that the punch (4) can be injected into the workpiece and process a hole inside the workpiece.

7. The processing method of the all-plastic water-assisted hollow crossbeam according to claim 6, characterized in that, In step S2, a return pipe (5) is also provided. The return pipe (5) includes a return end (51) connected to the nozzle (3) and an outlet end (52) connected to the pump body (2). In step S3, after the punch (4) is injected into the workpiece and a hole is machined inside the workpiece, the pump body (2) extracts the liquid or gas in the nozzle (3) and the workpiece hole through the return pipe (5).

8. The processing method of the all-plastic water-assisted hollow crossbeam according to claim 6 or 7, characterized in that, The mold assembly (1) is provided with a hot melt injection port (12) connected to the cavity (11). The hot melt injection port (12) is located at the other end of the workpiece in the cavity (11) where the hole needs to be processed. In step S3, raw material is injected into the cavity (11) of the mold assembly (1) through the hot melt injection port (12) to form a workpiece. When the punch (4) is injected into the workpiece and a hole is processed inside the workpiece, the raw material squeezed out by the punch (4) returns to the hot melt injection port (12) and is reheated to a molten state in the hot melt injection port (12) during the next injection and enters the cavity (11) together with the next batch of raw material.

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