WO2024119587A1 - Injection molding manufacturing method for long tubular products and injection mould therefor - Google Patents

Abstract

The present invention provides an injection molding manufacturing method for long tubular products and an injection mould therefor. The injection molding manufacturing method comprises: performing clamping treatment; performing injection molding in a synthetic cavity so as to wrap a second slide to form a long tubular product, a first slide and the second slide abutting against each other so as to ensure the stability of the first slide during injection molding, thus avoiding defective products caused by deviations generated due to pressure holding or other effects; and in response to an injection mould reaching a preset temperature, sequentially withdrawing the first slide and the second slide from the injection mould, at this time, the injection mould having not been released, and thus the mould still forming stable clamping positioning on the periphery of the product, so as to avoid disturbance deformation caused by unstable positioning of the product, and enable the product to be free of an external space, thus reducing the possibility of the product deforming during withdrawing of the first slide and the second slide; and in response to the first slide and the second slide having been completely withdrawn from the injection mould, releasing the injection mould, and ejecting the long tubular product out.

Description

Injection molding method for long tubular product and injection molding mold thereof [Technical field]

The invention relates to the field of mold injection, in particular to an injection molding manufacturing method for a long tubular product and an injection molding mold thereof.

【Background technique】

The core pulling mechanism of the existing mold mainly includes a slider core pulling mechanism and an inclined top core pulling mechanism. The slider core pulling mechanism requires that all the glue surfaces on the slider have a certain draft angle in its moving direction. Otherwise, since most molds are metal parts and the required products are generally plastic parts, when the product is removed from the mold, it will be pulled and scratched, thereby reducing the output rate of the product.

Moreover, in the existing core pulling mechanism, when the product is demolded and opened, the front and rear molds are opened first. Since long tubular products are more likely to have thin walls, the product is easily deformed due to a certain pulling force during demolding.

[Summary of the invention]

Based on this, the present invention provides an injection molding manufacturing method for a long tubular product and an injection mold thereof, so as to solve the problem that the inclined mold demolding easily causes product deformation when the long tubular product is demolded.

In a first aspect, the present invention provides an injection molding manufacturing method for a long tubular product, the injection molding manufacturing method comprising:

Providing an injection mold and performing a mold closing process, wherein the injection mold comprises a first row position and a second row position which are mutually abutted and positioned, and the first row position is arranged in a composite cavity;

Injection molding into the synthetic cavity to wrap around the second row to form a long tubular product; in response to the injection mold reaching a preset temperature, sequentially withdrawing the first row and the second row from the injection mold;

In response to the first slider and the second slider completely withdrawing from the injection mold, the injection mold is opened and the long tubular product is ejected.

Before the injection mold reaches the preset temperature, the method further includes: cooling the injection mold.

The cooling of the injection mold comprises:

Providing a preset cooling device; calculating the cooling time according to the cooling parameters of the cooling device, the volume and material properties of the long tubular product and the preset temperature;

In response to reaching the cooling time, cooling is completed and the injection mold is prompted to reach the preset temperature.

The surface of the second row is provided with an anti-stick coating.

During the process of the second row position withdrawing, the second row position also needs to be treated with water.

The injection molding into the synthetic cavity comprises:

injecting glue into the synthetic cavity by an injection molding machine;

In response to the completion of the injection molding, the injection molding machine maintains a preset pressure on the injection mold, and the screw of the injection molding machine stays still to perform a pressure-maintaining process.

The first row and the second row are coaxially arranged along a direction perpendicular to the gravity direction.

In a second aspect, the present invention provides an injection mold for a long tubular product, comprising:

A front mold and a rear mold cooperate with each other, and a synthetic cavity is formed when the front mold and the rear mold are combined. The rear mold is also provided with a first row position and a second row position that abut against each other, and the first row position and the second row position are coaxially arranged along a direction perpendicular to the gravity; wherein the first row position is accommodated in the synthetic cavity.

The surface of the second row is provided with an anti-stick coating.

The anti-stick coating is a titanium metal plating layer.

A water transport channel is arranged in the second row.

The second position also includes a connecting block extending out of the synthetic cavity, and the rear mold includes a stopper, which abuts against the product to eject the product; the second position passes through the stopper, and the second position includes an operating handle extending out of the synthetic cavity; the injection mold also includes a hydraulic mechanism, and the hydraulic structure injects into the injection mold and maintains pressure.

【Brief Description of the Drawings】

FIG1 is a schematic structural diagram of an embodiment of an injection mold of the present invention;

FIG2 is a partial cross-sectional structural schematic diagram of FIG1 ;

FIG3 is a schematic flow chart of an embodiment of an injection molding manufacturing method for a long tubular product of the present application;

FIG4 is a schematic flow chart of an embodiment of a step S30 before step S3 in FIG3 ;

FIG5 is a schematic diagram of a flow chart of an embodiment of step S2 described in FIG3 ;

FIG. 6 is a schematic diagram of the overall process of the injection molding manufacturing method of the long tubular product of the present application.

【Detailed ways】

In order to facilitate a better understanding of the present invention, the present invention will be further explained below in conjunction with the accompanying drawings of relevant embodiments. The accompanying drawings provide embodiments of the present invention, but the present invention is not limited to the above-mentioned preferred embodiments. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more comprehensive.

The logic and/or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

In one aspect of the present application, there is provided an injection mold 10 for a long tubular product, comprising a front mold 1 and a rear mold 2 that cooperate with each other, and a composite cavity is formed after the front mold 1 and the rear mold 2 are molded together. Please refer to Figures 1 and 2 in combination, Figure 1 is a structural schematic diagram of an embodiment of the injection mold 10 of the present application; Figure 2 is a partial cross-sectional structural schematic diagram of Figure 1. The rear mold 2 is also provided with a first row position 21 and a second row position 22 that abut against each other, and the first row position 21 and the second row position 22 are coaxially arranged along a direction perpendicular to the gravity, ensuring that the first row position 21 and the second row position 22 will not be offset due to pressure when the injection molding machine 3 is performing injection molding, thereby producing unnecessary defective products. Among them, the first row position 21 is accommodated in the composite cavity. The first row position 21 and the second row position 22 are placed horizontally, and there is no angle with the horizontal direction. At this time, the injection mold 10 is ejected at zero degrees when ejected. That is to say, at this time, the injection mold 10 of the long tubular product does not have a certain inclination, so that the obtained product will not be affected by the inclination angle, thereby improving the precision of the product obtained by the injection mold 10, and obtaining a long tubular product with a larger built-in capacity, which is more in line with the needs of existing products and development.

In some embodiments, the surface of the first row 21 is provided with an anti-stick coating. Since the first row 21 and the second row 22 are coaxially arranged perpendicular to the direction of gravity, the injection mold does not have a certain inclination slope, which creates certain difficulties in removing the product. At this time, in order to be able to remove the product smoothly, a greater suction force is required than the inclined demoulding core pulling structure. Due to the use of a greater suction force, the entire injection mold 10 is more susceptible to the influence of the pulling force when the product is extracted, causing certain damage to the product. Therefore, in order to reduce or even avoid damage to the product, the second row 22 is coated with an anti-stick coating. Furthermore, the anti-stick coating is generally a bonding layer, including a wear-resistant transition layer on the bonding layer and an anti-stick functional layer on the wear-resistant transition layer. The bonding layer is generally formed by PVD coating technology.

In some specific embodiments, the anti-stick coating is a titanium metal coating. Compared with other metal coatings, titanium metal can be used for a long time at a high temperature of 600°C without fatigue, and is not easy to deform under high temperature open flame conditions. However, the rigidity of the product after molding is very large and it is not easy to deform after molding. On the other hand, titanium metal is safer. Although the titanium metal coating on the second row 22 is worn and contaminated on the product when the product is extracted, it will not have a metallic effect on the human body during use.

In order to better cool the product in the injection mold 10 and make it molded faster, please continue to refer to Figure 2. In some embodiments, a water transport channel 220 is provided in the second row 22. Cooling water is circulated in the water transport channel 220 to accelerate the cooling speed of the product while ensuring that the product in the injection mold 10 will not have uneven problems due to uneven temperature, thereby reducing the possibility of producing defective products.

In some embodiments, the second row 22 also includes a connecting block 221 extending out of the synthetic cavity, and the rear mold 2 includes a stopper 20, which abuts against the product to eject the product. The stopper 20 is used to eject the product from the entire injection mold 10. The stopper is also arranged in a direction perpendicular to the gravity, and because the stopper 20 is in vertical contact with the product, after the product is completely cooled, the stopper 20 is used to eject it from the rear end of the product without damaging the product. The injection mold 10 also includes a hydraulic mechanism (not shown), and the hydraulic structure injects into the injection mold 10 and maintains pressure. The setting of the connecting block 221 increases the contact area between the hydraulic structure and the second row 22 when pulling it out, further ensuring the stability of the second row 22, thereby ensuring that the second row 22 does not shake when being pulled out, reducing the possibility of scratches on the product due to shaking.

Specifically, based on the injection mold 10 of the long tubular product, the present application also provides an injection molding manufacturing method for the long tubular product. Please refer to FIG. 3 and FIG. 6 in combination. FIG. 3 is a flow chart of an embodiment of the injection molding manufacturing method for the long tubular product of the present application; FIG. 6 is a flow chart of the entire injection molding manufacturing method for the long tubular product of the present application. The injection molding manufacturing method for the long tubular product includes:

Step S1: Provide an injection mold 10 and perform a mold closing process. When performing injection molding, the injection mold 10 needs to be mold closed so that the injection mold 10 forms a synthetic cavity of the product. The synthetic cavity provides space for the formation of the product and forms a cavity of the product. The injection sol flows in the synthetic cavity under the action of the hydraulic injection molding machine and fills the entire synthetic cavity. The synthetic cavity is an internal space formed by the front and rear molds closing and a tubular space formed by removing most of the space occupied by the second row 22 and part of the first row 21. At the same time, due to the action of the mold closing, the entire synthetic cavity is tightly closed, thereby ensuring that the injection molding material will not overflow from the cavity.

Specifically, the injection mold includes a first row position 21 and a second row position 22 which are positioned against each other, and the first row position 21 is arranged in the synthetic cavity to form small holes for the long tubular product and avoid internal vacuum.

Preferably, the surfaces of the first row 21 and the second row 22 are provided with an anti-stick coating. Similarly, the anti-stick coating is also a bonding layer, including a wear-resistant transition layer on the bonding layer and an anti-stick functional layer on the wear-resistant transition layer. The bonding layer is generally formed by PVD coating technology.

Step S2: Injection molding into the synthetic cavity to wrap around the first row 21 to form a long tubular product. In a specific implementation scenario, the first row 21 and the second row 22 are coaxially arranged perpendicular to the direction of gravity. On the basis of the mold closing and injection mold 10 of step S1, injection molding is performed into the synthetic cavity in the injection mold 10 to obtain a long tubular product perpendicular to the direction of gravity. Compared with other core-pulling injection molds 10 with a certain inclination, the long tubular product can have a larger internal accommodation area, can accommodate more other parts, and better meet the requirements of the field of modern structural technology.

Step S3: In response to the injection mold 10 reaching the preset temperature, the first row 21 and the second row 22 are sequentially withdrawn from the injection mold 10. The process of making the injection mold 10 reach the preset temperature is the cooling process, through which the injection mold 10 is completely cooled. On the basis of the above step S2, the first row 21 is preferentially withdrawn without opening the mold, so as to ensure that the small hole end of the long tubular product is unobstructed, avoid shrinkage holes in the product vacuum, produce defective products, and reduce the product pass rate. After the first row 21 is completely withdrawn, the second row 22 is withdrawn from the product mold. At this time, since the front mold 1 and the rear mold 2 are not opened, although the product may be deformed when the second row 22 is withdrawn, the injection mold 10 is not opened at this time, and the injection mold 10 still forms a stable clamping positioning around the product, which not only avoids the disturbance deformation caused by the unstable positioning of the product, but also reduces the possibility of deformation of the product when the first row 21 and the second row 22 are withdrawn due to the lack of external space.

Step S4: in response to the first row position 21 and the second row position 22 completely withdrawing from the injection mold 10, the injection mold 10 is opened and the long tubular product is ejected.

In some specific embodiments, during the injection molding, the heat generated is relatively large due to the operations such as mold closing and pressure holding in the above-mentioned steps S1 and S2. Therefore, when the injection mold 10 reaches the preset temperature, it is necessary to manually cool the injection mold 10. In the injection mold 10 of the long tubular product of the present application, a water transport channel 220 is provided in the second row 22. By continuously circulating cooling water in the water transport channel 220, the second row 22 can be treated with water during the process of the second row 22 exiting. This further helps the product and the entire injection mold 10 to cool down quickly, reduces the molding shrinkage of the product, further reduces the possibility of warping and deformation of the product, and maintains the yield rate.

In summary, the injection molding manufacturing method of the above-mentioned long tubular product provided by the present application includes providing an injection mold 10 and performing a mold closing process, wherein the injection mold 10 includes a first row position 21 and a second row position 22 that are mutually abutted and positioned, and the first row position 21 is arranged in a synthetic cavity, which ensures the stability of the first row position 21 during injection molding, and does not deviate due to pressure holding or other effects, thereby causing defective products. Injection molding into the synthetic cavity is wrapped around the second row position 22 to form a long tubular product. In response to the injection mold 10 reaching the preset temperature, the first row 21 and the second row 22 are sequentially withdrawn from the injection mold 10. The process of making the injection mold 10 reach the preset temperature is the cooling process, through which the injection mold 10 is completely cooled, so that the product is completely finalized, and in the process of the first row 21 and the second row 22 being sequentially withdrawn, the injection mold 10 is not opened at this time, and the mold still forms a stable clamping positioning around the product, which not only avoids the disturbance deformation caused by the unstable positioning of the product, but also reduces the possibility of deformation of the product when the first row 21 and the second row 22 are pulled out due to the lack of external space. In response to the first row 21 and the second row 22 being completely withdrawn from the injection mold 10, the injection mold 10 is opened and the long tubular product is ejected.

In some implementation scenarios, before step S3, in order to speed up the cooling of the injection mold 10 and improve the production efficiency of the product, step S30 is also included: cooling the injection mold 10. It can be understood that since the speed of natural cooling is slow, the longer the cooling time is, the greater the possibility of deformation of the injection molded product. Therefore, the injection mold can also be cooled by external intervention.

In order to improve the production efficiency of the product and avoid deformation of the product due to overly high cooling temperature, it is necessary to calculate and set the cooling temperature of the injection mold 10 in advance according to different materials and needs, and to achieve cooling of the product through certain means. Therefore, an additional cooling device (not shown) is preset outside the injection mold 10, which is used to provide a water transport channel or other means for cooling the product for the injection mold 10.

Specifically, please refer to FIG. 4 , which is a flowchart of an embodiment of a step S30 before step S3 in FIG. 3 , wherein step S30 specifically includes:

Step S301: Calculate cooling time according to cooling parameters of cooling equipment, volume and material characteristics of the long tubular product and preset temperature. Products made of different materials have different cooling parameters and cooling preset temperatures.

Since the product is arranged in a direction perpendicular to gravity, compared with other injection molds 10 with a certain slope, although this arrangement can produce products with thinner wall thickness, due to the placement problem, in order to achieve the same cooling effect as similar products of the same material, it is necessary to extend its cooling time. In some specific implementation scenarios, the injection mold 10 of the present application requires a cooling time greater than or equal to 30 seconds. For example, when using circulating cooling water to set multiple cycles, it is necessary to cool for 50 seconds.

Step S302 : in response to reaching the cooling time, the first row 21 and the second row 22 are withdrawn from the injection mold 10 in sequence.

Please refer to FIG5, which is a schematic diagram of a flow chart of an embodiment of step S2 in FIG3. Step S2 specifically includes:

Step S21: injecting glue into the synthetic cavity through the injection molding machine 3. Before using the injection molding machine 3 for injection, it is necessary to first test the injection molding machine 3 and squeeze out the residual waste in the injection molding machine 3 under the condition of ensuring the correct melt temperature, until the injection molding machine 3 is full of new materials, and then inject the injection mold 10 pounds of glue.

Step S22: In response to the completion of the injection, the injection molding machine 3 maintains a preset pressure on the injection mold 10, and the screw of the injection molding machine 3 remains stationary to perform a pressure holding process. The pressure holding process is to prevent the melt from flowing back during cooling. Inevitably, a certain amount of shrinkage will occur during the cooling process of the product. During the pressure holding process, the injection molding machine 3 continues to inject the melt into the injection mold 10, thereby replenishing the empty space generated when the cold shrinkage occurs, thereby ensuring the best molding quality of the product and improving the yield rate.

In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradicting each other.

The above are only implementation methods of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims (12)

A method for manufacturing a long tubular product by injection molding, wherein the method comprises: Providing an injection mold and performing a mold closing process, wherein the injection mold comprises a first row position and a second row position which are mutually abutted and positioned, and the second row position is arranged in a composite cavity; Injection molding into the synthetic cavity to wrap around the second row to form a long tubular product; In response to the injection mold reaching a preset temperature, sequentially withdrawing the first position and the second position from the injection mold; In response to the first slider and the second slider completely withdrawing from the injection mold, the injection mold is opened and the long tubular product is ejected. The injection molding manufacturing method according to claim 1, wherein, before the injection mold reaches the preset temperature, the method further comprises: The injection mold is cooled. The injection molding manufacturing method according to claim 2, wherein cooling the injection mold comprises: Provide preset cooling equipment; Calculating the cooling time according to the cooling parameters of the cooling equipment, the volume and material properties of the long tubular product and the preset temperature; In response to reaching the cooling time, cooling is completed and the injection mold is prompted to reach the preset temperature. The injection molding manufacturing method according to claim 1, wherein the surface of the second row is provided with an anti-stick coating. According to the injection molding manufacturing method according to claim 1, during the process of the second slide position withdrawing, the second slide position also needs to be subjected to water transportation treatment. The injection molding manufacturing method according to claim 1, wherein the injection molding into the synthetic cavity comprises: injecting glue into the synthetic cavity by an injection molding machine; In response to the completion of the injection molding, the injection molding machine maintains a preset pressure on the injection mold, and the screw of the injection molding machine stays still to perform a pressure-maintaining process. The injection molding manufacturing method according to claim 1, wherein the first row position and the second row position are coaxially arranged along a direction perpendicular to the gravity direction. An injection mold for a long tubular product comprises a front mold and a rear mold that cooperate with each other, and the front mold and the rear mold form a composite cavity after being molded together, wherein: The rear mold is also provided with a first row position and a second row position which abut against each other, wherein the first row position and the second row position are coaxially arranged along a direction perpendicular to the gravity, wherein the first row position is accommodated in the synthetic cavity. The injection mold according to claim 8, wherein the surface of the second position is provided with an anti-stick coating. The injection mold according to claim 9, wherein the anti-stick coating is a titanium metal plating. The injection mold according to claim 8, wherein a water transport channel is provided in the second row. The injection mold according to claim 8, wherein the rear mold includes a stopper, the stopper abuts against the product to eject the product; The second position passes through the stopper, and the second position includes an operating handle extending out of the synthetic cavity; The injection mold further comprises a hydraulic mechanism, and the hydraulic structure injects into the injection mold and realizes pressure maintenance.

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