Injection molding method for long tubular products and injection molding mold therefor

Abstract

The application discloses a kind of injection molding manufacturing method of long tubular product and its injection molding mold, the injection molding manufacturing method includes mold processing, injection to the injection molding cavity in, to form long tubular product on the second row position, first row position and second row position each other and guarantee the stability of first row position when injection molding, it cannot produce deviation due to pressure maintaining or other effects and then cause to appear defective product because of not offset.The first row position and the second row position are sequentially withdrawn from the injection molding mold in response to the injection molding mold reaching preset temperature, at this time, the injection molding mold is not opened, and the mold still forms stable clamping positioning around the product, not only avoids the disturbance deformation caused by unstable positioning of the product, but also makes the product less likely to deform when the first row position and the second row position are withdrawn because there is no external space.The injection molding mold is opened after the first row position and the second row position are completely withdrawn from the injection molding mold, and the long tubular product is ejected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mold injection, in particular to a long tubular product injection molding manufacturing method and injection molding mold. BACKGROUND

[0002] The core-pulling mechanism of the existing mold mainly includes a slider core-pulling mechanism and an inclined core-pulling mechanism. The slider core-pulling mechanism requires that all glue surfaces on the slider have a certain draft angle in the direction of movement, otherwise, since the mold is generally a metal part and the product is generally a plastic part, when the product is pulled out of the mold, the product is easily damaged due to the pulling force, thereby reducing the yield of the product.

[0003] In addition, in the existing core-pulling mechanism, when the product is ejected and opened, the front and rear molds are opened first. Since the long tubular product has a thin wall, the product is easily deformed when being ejected due to a certain pulling force. SUMMARY

[0004] The present application provides a long tubular product injection molding manufacturing method and injection molding mold to solve the problem that the draft ejection easily causes the product to deform when the long tubular product is ejected.

[0005] In one aspect of the present application, a long tubular product injection molding manufacturing method is provided, which includes: providing an injection molding mold and performing a mold closing process, wherein the injection molding mold includes a first row position and a second row position positioned against each other, and the first row position is arranged in a combined cavity; injection molding into the combined cavity to form a long tubular product wrapped on the second row position; in response to the injection molding mold reaching a preset temperature, sequentially withdrawing the first row position and the second row position from the injection molding mold; and in response to the first row position and the second row position being completely withdrawn from the injection molding mold, opening the injection molding mold and ejecting the long tubular product.

[0006] Specifically, before the injection molding mold reaches the preset temperature, the injection molding mold is cooled.

[0007] Specifically, the cooling of the injection molding mold includes: providing a preset cooling device; calculating a cooling time according to the cooling parameters of the cooling device, the volume and material characteristics of the long tubular product, and the preset temperature; and in response to reaching the cooling time, completing the cooling and prompting that the injection molding mold reaches the preset temperature.

[0008] Specifically, the surface of the second row position is provided with an anti-sticking coating.

[0009] Specifically, during the withdrawal of the second row position, the second row position needs to be watered.

[0010] Specifically, the injection into the synthetic cavity comprises: injecting glue into the synthetic cavity by an injection machine; and performing a pressure maintaining process in response to completion of the glue injection, in which the injection machine maintains a preset pressure and the screw of the injection machine stays still.

[0011] Specifically, the first row position and the second row position are coaxially arranged along a direction perpendicular to the direction of gravity.

[0012] Another aspect of the present application provides an injection mold for a long tubular product, comprising a front mold and a back mold which are matched with each other and form a synthetic cavity after being closed, and the back mold is further provided with a first row position and a second row position which abut against each other, and the first row position and the second row position are coaxially arranged along a direction perpendicular to the direction of gravity, wherein the first row position is accommodated in the synthetic cavity.

[0013] Specifically, the surface of the second row position is provided with an anti-sticking coating.

[0014] Specifically, the anti-sticking coating is a titanium metal plating layer.

[0015] Specifically, the second row position is provided with a water conveying channel.

[0016] Specifically, the second row position further comprises a connecting block which extends out of the synthetic cavity, and the back mold comprises a stop block which abuts against the product for ejecting the product. The second row position passes through the stop block, and the second row position comprises an operating handle which extends out of the synthetic cavity. The injection mold further comprises a hydraulic mechanism which injects and performs pressure maintaining for the injection mold.

[0017] The beneficial effects of the present application are: the injection molding manufacturing method of the long tubular product provided by the present application, comprising providing an injection mold and performing mold closing processing, wherein the injection mold comprises a first row position and a second row position positioned against each other, and the first row position is arranged in a combined cavity, which ensures the stability of the first row position during injection molding, and offsetting due to pressure retention or other effects to cause defective products. Injection molding into the combined cavity to form a long tubular product wrapped on the second row position. In response to the injection mold reaching a preset temperature, the first row position and the second row position are sequentially withdrawn from the injection mold, so that the process of the injection mold reaching the preset temperature is the cooling process, which completely cools the injection mold, so that the product is completely shaped and completed, and during the sequential withdrawal of the first row position and the second row position, the injection mold is not opened at this time, and the mold still forms stable clamping positioning around the product, not only avoiding the disturbance deformation caused by unstable positioning of the product, but also reducing the possibility of deformation of the product when the first row position and the second row position are withdrawn. In response to the first row position and the second row position being completely withdrawn from the injection mold, the injection mold is opened, and the long tubular product is ejected. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of an embodiment of the injection mold of the present application;

[0019] Figure 2 is a partial cross-sectional structural schematic diagram of Figure 1 ;

[0020] Figure 3 is a flowchart of an embodiment of the injection molding manufacturing method of the long tubular product of the present application, and the test method comprises steps S2 and S3;

[0021] Figure 4 is a flowchart of an embodiment of step S30 before step S3 in Figure 3 ;

[0022] Figure 5 is a flowchart of an embodiment of step S2 described in Figure 3 ;

[0023] Figure 6 is a flowchart of the overall injection molding manufacturing method of the long tubular product of the present application. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0025] In the following description, for the purposes of explanation and not limitation, specific details are set forth such as particular architectures, interfaces, techniques, etc. in order to provide a thorough understanding of the present application.

[0026] The terms "system", "unit" and "network" are often used interchangeably herein. The term "and / or", merely describes an associated relationship, which means that there can be three kinds of relationships, for example, A and / or B, which means that A exists alone, A and B exist together, B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects. In addition, "multiple" herein means two or more than two.

[0027] In one aspect of the present application, an injection mold 10 for a long tubular product is provided, which comprises a front mold 1 and a rear mold 2 that cooperate with each other and form a combined cavity after the front mold 1 and the rear mold 2 are closed. Please refer to Figure 1 and Figure 2 , 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 direction of gravity, which ensures that the first row position 21 will not be offset due to the pressure during the injection by the injection machine 3, thereby generating unnecessary defective products. The first row position 21 is accommodated in the combined cavity. The first row position 21 and the second row position 22 are horizontally placed and have no angle with the horizontal direction, at this time, the injection mold 10 is zero-degree ejection when it is ejected. That is, at this time, the injection mold 10 for the long tubular product does not have a certain slope, 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, obtaining a long tubular product with larger built-in capacity, which is more in line with the needs of existing products and development.

[0028] In some embodiments, the surface of the first row of positions 21 is provided with an anti-sticking coating. Since the first row of positions 21 and the second row of positions 22 are coaxially arranged perpendicular to the direction of gravity, the injection mold is difficult to remove the product due to the absence of a certain slope. At this time, in order to be able to smoothly remove the product, a greater pulling force is required compared to the slope core-pulling structure. Since a greater pulling force is used, the entire injection mold 10 is more susceptible to pulling forces when removing the product, which can cause damage to the product. Therefore, in order to reduce or even avoid damage to the product, the second row of positions 22 is provided with an anti-sticking coating. Further, the anti-sticking coating is generally a bonding layer, including a wear-resistant transition layer on the bonding layer and an anti-sticking functional layer on the wear-resistant transition layer. The bonding layer is generally formed by PVD coating technology.

[0029] In some specific embodiments, the anti-sticking coating is a titanium metal plating layer. Compared with other metal plating layers, titanium metal can be used at high temperatures of 600°C for a long time without fatigue, and is not easily deformed under high-temperature flame conditions. However, the steel of the product after forming is very large, and it is not easy to deform after forming. On the other hand, titanium metal is safer, although the titanium metal plating layer on the second row of positions 22 is worn and contaminated on the product when the product is removed, it will not have metallic effects on the human body when used.

[0030] In order to better cool the product in the injection mold 10 and make it form faster, please continue to refer to Figure 2 In some embodiments, the second row of positions 22 is provided with a water conveying channel 220. The circulation of cooling water in the water conveying channel 220 not only accelerates the cooling speed of the product, but also ensures that the product in the injection mold 10 will not have uneven problems due to uneven temperature, reducing the possibility of producing defective products.

[0031] In some embodiments, the second row of positions 22 further includes a connecting block 221 extending out of the combined forming cavity, and the rear mold 2 includes a stop block 20 abutting against the product for ejecting the product. The stop block 20 is used to eject the product from the entire injection mold 10, and the stop block is also arranged perpendicular to the direction of gravity, and since the stop block 20 is in vertical contact with the product, the product is ejected from the rear end of the product using the stop block 20 after the product is completely cooled, without damaging the product. The injection mold 10 further includes a hydraulic mechanism (not shown in the figure), which injects and realizes pressure maintenance for the injection mold 10. The provision of the connecting block 221 increases the contact area between the hydraulic mechanism and the second row of positions 22 when the hydraulic mechanism pulls out the second row of positions 22, further ensuring the stability of the second row of positions 22, so that the second row of positions 22 will not shake when being pulled out, reducing the possibility of scratches on the product due to shaking.

[0032] Specifically, based on the above-mentioned injection mold 10 for long tubular products, the application further provides an injection molding method for long tubular products, please refer toFigure 3 and Figure 6 , Figure 3 is a flowchart of an embodiment of the injection molding method of the long tubular product of the present application; Figure 6 is a flowchart of the injection molding method of the long tubular product of the present application. The injection molding method of the long tubular product includes:

[0033] Step S1: Provide an injection mold 10 and perform a clamping process. When injection molding is performed, the injection mold 10 needs to be clamped to form a synthetic cavity of the product. The synthetic cavity provides space for the formation of the product, forms the cavity of the product, and the sol of the injection flows and fills the entire synthetic cavity under the action of the hydraulic injection molding machine. Among them, the synthetic cavity is the internal space formed by the clamping of the front and rear molds and the tubular space formed by removing most of the space occupied by the second row of positions 22 and part of the first row of positions 21. At the same time, due to the clamping effect, the entire synthetic cavity is tightly closed, thereby ensuring that the injection material does not overflow outside the mold cavity.

[0034] Specifically, the injection mold includes a first row of positions 21 and a second row of positions 22 that are positioned against each other, and the first row of positions 21 is arranged in the synthetic cavity to form a small hole for the long tubular product and avoid internal vacuum.

[0035] Preferably, the first row of positions 21 and the second row of positions 22 are provided with an anti-sticking coating. Similarly, the anti-sticking coating is also a bonding layer, which includes a wear-resistant transition layer on the bonding layer and an anti-sticking functional layer on the wear-resistant transition layer. The bonding layer is generally formed by PVD coating technology.

[0036] Step S2: Injection molding into the synthetic cavity to form a long tubular product wrapped on the first row of positions 21. In one specific implementation scenario, the first row of positions 21 and the second row of positions 22 are coaxially arranged along the direction perpendicular to the direction of gravity. Based on the clamping of step S1 and the injection mold 10, injection molding is performed into the synthetic cavity of 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 slope, the long tubular product can have a larger internal accommodation area and can accommodate more other components, which is more in line with the requirements of the modern structure technology field.

[0037] 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, on the basis of not opening the mold, the first row 21 is preferentially withdrawn, ensuring that the small hole end of the long tubular product is unobstructed, avoiding shrinkage of the product under vacuum, so as to produce defective products and reduce the pass rate of products. The second row 22 is withdrawn from the product mold after the first row 21 is completely withdrawn. At this time, although the product may be deformed when the second row 22 is withdrawn, the injection mold 10 is not opened, and the injection mold 10 still forms stable clamping and positioning around the product. Not only does it avoid the disturbance deformation caused by unstable positioning of the product, but it also reduces the possibility of product deformation when the first row 21 and the second row 22 are withdrawn due to the lack of external space.

[0038] Step S4: 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.

[0039] In some specific embodiments, when injection molding is performed, a large amount of heat is generated due to the clamping and pressure maintaining operations in the above steps S1 and S2. Therefore, the injection mold 10 needs to be cooled manually to reach the preset temperature. In the injection mold 10 of the long tubular product of the present application, a water conveying channel 220 is arranged in the second row 22. By continuously circulating and conveying cooling water in the water conveying channel 220, the second row 22 can be water-transported during the withdrawal process. This in turn helps to quickly cool the product and the entire injection mold 10, reduces the molding shrinkage of the product, further reduces the possibility of warpage deformation of the product, and maintains the yield rate.

[0040] In summary, the injection molding method for the long tubular product provided by the application comprises providing an injection mold 10 and performing mold clamping, wherein the injection mold 10 comprises a first row position 21 and a second row position 22 positioned against each other, and the first row position 21 is arranged in the combined cavity, thereby ensuring the stability of the first row position 21 during injection molding and preventing the first row position 21 from deviating due to pressure maintaining or other effects and causing defective products. The injection molding is performed in the combined cavity to form the long tubular product wrapped on the second row position 22. In response to the injection mold 10 reaching a preset temperature, the first row position 21 and the second row position 22 are sequentially withdrawn from the injection mold 10, and the process of the injection mold 10 reaching the preset temperature is the cooling process. Through the process, the injection mold 10 is completely cooled, thereby completing the complete shaping of the product. During the sequential withdrawal of the first row position 21 and the second row position 22, the injection mold 10 is not opened, and the mold still stably clamps and positions the product around, thereby avoiding the disturbance deformation caused by unstable positioning of the product and reducing the possibility of deformation of the product during the withdrawal of the first row position 21 and the second row position 22 due to the absence of external space. After the first row position 21 and the second row position 22 are completely withdrawn from the injection mold 10, the injection mold 10 is opened, and the long tubular product is ejected.

[0041] In some implementation scenarios, before step S3, in order to accelerate the cooling of the injection mold 10 and improve the production efficiency of the product, step S30 of cooling the injection mold 10 is further included. It can be understood that, due to the slow speed of natural cooling, the longer the cooling time of the injection molded product, the greater the possibility of deformation. Therefore, the injection mold can also be cooled by external intervention.

[0042] In order to improve the production efficiency of the product and avoid deformation of the product caused by excessively high cooling temperature, the cooling temperature of the injection mold 10 needs to be calculated and set in advance according to different materials and needs, and cooled by certain means. Therefore, an additional cooling equipment (not shown in the figure) is additionally provided outside the injection mold 10, which is used to provide a water channel or other means for cooling the product for the injection mold 10.

[0043] Specifically, please refer to Figure 4 , Figure 4 is Figure 3 the flowchart of an embodiment of step S30 before step S3 in FIG. 5, and step S30 specifically comprises:

[0044] Step S301: calculating the cooling time according to the cooling parameters of the cooling equipment, the volume and material characteristics of the long tubular product, and the preset temperature. Products made of different materials have different cooling parameters and cooling preset temperatures.

[0045] Since the product is arranged along a direction perpendicular to the gravity, compared with other injection molds 10 with a certain slope, although this arrangement can produce a product with a thinner wall thickness, due to the arrangement problem, in order to achieve the same cooling effect as a similar product of the same material, it is necessary to lengthen the cooling time. In some specific implementation scenarios, the cooling time required by the injection mold 10 of the present application is greater than or equal to 30 seconds. For example, when using a circulating cooling water arrangement with multiple cycles, 50 seconds of cooling is required.

[0046] Step S302: In response to reaching the cooling time, the first row of positions 21 and the second row of positions 22 are sequentially withdrawn from the injection mold 10.

[0047] Please refer to Figure 5 , Figure 5 is Figure 3 a flowchart of an embodiment of step S2 described in the foregoing. Step S2 specifically includes the following steps:

[0048] Step S21: Injecting glue into the synthetic cavity by the injection molding machine 3. Before using the injection molding machine 3 to inject glue, under the condition of ensuring that the melting temperature is correct, the injection molding machine 3 needs to be tested first, and the residual waste in the injection molding machine 3 needs to be extruded until the injection molding machine 3 is full of new material, and then the injection molding machine 3 is used to inject glue into the injection mold 10.

[0049] Step S22: In response to completing the injection of glue, the injection molding machine 3 maintains a predetermined pressure on the injection mold 10, and the screw of the injection molding machine 3 is stationary for pressure maintaining treatment. The pressure maintaining treatment is to prevent the glue from flowing back when it is cooled. During the cooling process of the product, a certain shrinkage will inevitably occur. During the pressure maintaining treatment, the injection molding machine 3 continues to inject glue into the injection mold 10, thereby supplementing the empty space generated when the shrinkage occurs, and ensuring the best molding quality of the product and improving the yield.

[0050] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, mechanisms, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0051] The above merely describes the embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made by using the content of the present application specification and drawings, is also included in the patent protection scope of the present application.

Claims

1. A method of injection molding a long tubular product, characterized in that, The application relates to a method for manufacturing a long tubular product, and belongs to the technical field of injection molding. The method comprises the following steps: 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 positioned in opposition to each other, the second row position is arranged in a synthetic cavity, the first row position and the second row position are coaxially arranged along a direction perpendicular to a gravity direction, the injection mold further comprises a front mold and a rear mold which are matched with each other, and the front mold and the rear mold form the synthetic cavity after being closed, and the front mold and the rear mold are arranged in a top-down manner along the gravity direction; injection molding into the synthetic cavity to form the long tubular product on the second row position; in response to the injection mold reaching a preset temperature, sequentially withdrawing the first row position and the second row position from the injection mold; 2. The injection molding manufacturing method according to claim 1, characterized in that, in response to the first row position and the second row position being completely withdrawn from the injection mold, opening the injection mold and ejecting the long tubular product. Before the step of responding to the injection mold reaching the preset temperature, the method further comprises the following step:

3. The injection molding manufacturing method of claim 2, wherein, cooling the injection mold. The step of cooling the injection mold comprises the following steps: providing a preset cooling device; calculating a cooling time according to a cooling parameter of the cooling device, a volume and material characteristics of the long tubular product and the preset temperature; 4. The injection molding manufacturing method of claim 1, wherein, in response to the cooling time being reached, completing the cooling and prompting the injection mold to reach the preset temperature.

5. The injection molding manufacturing method of claim 1, wherein, A surface of the second row position is provided with an anti-sticking coating.

6. The injection molding manufacturing method of claim 1, wherein, In the process of withdrawing the second row position, the second row position needs to be subjected to water carrying treatment. The step of injection molding into the synthetic cavity comprises the following steps: injecting glue into the synthetic cavity by an injection molding machine; in response to the injection being completed, the injection molding machine keeps a preset pressure on the injection mold, and a screw of the injection molding machine is kept stationary to perform a pressure maintaining process.

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