A long core injection molding mold for a plastic hollow cabinet plate and a production and use method thereof

Abstract

The application relates to a plastic hollow cabinet plate long core-pulling injection molding mold and a production and use method thereof, and relates to the technical field of injection molding molds. The mold comprises a mold base with a long core-pulling groove penetrating through both ends of the mold base, and is characterized in that the mold further comprises a core-pulling element movably arranged in the long core-pulling groove and a core-pulling driving assembly for driving the core-pulling element to be inserted into or withdrawn from the long core-pulling groove; two core-pulling elements are arranged in the long core-pulling groove in a one-to-two mode and are respectively inserted from both ends of the long core-pulling groove; the middle part of the long core-pulling groove is provided with a positioning element for positioning the end parts of the two core-pulling elements; and the core-pulling elements and the long core-pulling groove form injection molding channels with uniform widths. The application has the effect of improving the qualified rate of plastic hollow cabinet plates.

Description

Technical Field

[0001] This invention relates to the field of injection molding dies, and in particular to a long core-pulling injection molding die for a hollow plastic cabinet panel and its production and usage method. Background Technology

[0002] Plastic hollow cabinet panels are mostly thin-walled structures and require through holes at both ends to meet the needs of assembly, weight reduction, or ventilation. Their molding quality directly determines the structural stability and service life of the product, thus placing stringent requirements on the precision and reliability of injection molding molds.

[0003] The through-hole forming of plastic hollow cabinet panels mainly relies on long core-pulling injection molding technology. Conventional long core-pulling injection molding molds mostly adopt a single integral core-pulling structure, that is, a long core-pulling groove is opened through the mold body, and a single integral core is moved and installed in the long core-pulling groove. The single integral core is driven to move by a cylinder.

[0004] Because the through-hole length of the plastic hollow cabinet panel is relatively long, the corresponding core pulling length also increases. Under its own weight, the end of a single core pulling is prone to sagging, resulting in uneven injection molding channel width between the core pulling and the mold cavity. This leads to excessive deviation in the wall thickness of the through-hole of the plastic hollow cabinet panel, and a significant reduction in the product qualification rate. Summary of the Invention

[0005] To improve the pass rate of plastic hollow cabinet panels, this invention provides a long core-pulling injection molding mold for plastic hollow cabinet panels and its production and usage method.

[0006] In a first aspect, the present invention provides a long core-pulling injection molding mold for hollow plastic cabinet panels, employing the following technical solution:

[0007] A plastic hollow cabinet panel long core-pulling injection molding mold includes a mold base with a long core-pulling groove that extends through both ends of the mold base, and also includes a core puller that is movably installed in the long core-pulling groove and a core-pulling drive assembly that drives the core puller to insert into or retract from the long core-pulling groove.

[0008] Each of the long core-pulling slots is provided with two core pullers, and the two core pullers are inserted from both ends of the long core-pulling slot respectively.

[0009] The long core-pulling groove is provided with a positioning element in the middle for positioning the two core-pulling ends, and a uniformly wide injection molding channel is formed between the core-pulling and the long core-pulling groove.

[0010] By adopting the above technical solution, the core pulling is divided into two parts and driven separately by a core pulling drive component, thereby shortening the length of a single core pulling to reduce the deformation when the core pull enters the long core pulling slot; at the same time, a positioning component is installed in the middle of the long core pulling slot to position the core pulling on both sides, so that the core pulling can be in a preset position when it enters the long core pulling slot, thereby ensuring that the gap between the core pulling and the long core pulling slot is uniform.

[0011] Optionally, the positioning member has a T-shaped insert, and both of the two core-pulling ends have positioning grooves and their ends abut against each other to form a positioning cavity for the insert to be fully inserted; when the insert is located in the positioning cavity, the circumferential sidewall of the core pull is separated from the inner wall of the long core-pulling groove to form the injection molding channel.

[0012] By adopting the above technical solution, after the two core pullers enter the long core puller groove, the positioning component can position the core pullers so that the two core pullers are aligned when they come into contact, and ensure that the gap between the core pullers and the long core puller groove is uniform.

[0013] Optionally, the top of the insert has a downwardly inclined correction surface, and the positioning groove moves along the inclined correction surface and abuts against the top of the insert for position correction.

[0014] By adopting the above technical solution, when the core is pulled into the long core-pulling groove, the edge of the positioning groove can move along the inclined straightening front. When the core-pulling end moves to the top of the embedding part, the core is in a horizontal state. At this time, the gap between the core and the long core-pulling groove is evenly distributed.

[0015] Optionally, the core-pulling drive assembly includes a core-pulling cylinder and a connector; the connector connects the output end of the core-pulling cylinder and the core-pulling mechanism; the core-pulling cylinder is installed within the forward projection range of the bottom surface of the mold base.

[0016] By adopting the above technical solution, the core-pulling cylinder is installed within the positive projection range of the bottom surface of the mold base, thereby reducing the overall volume of the entire mold.

[0017] Secondly, this application provides a method for producing and using a long core-pulling injection molding die for a plastic hollow cabinet panel, employing the following technical solution:

[0018] A method for producing and using a long core-pulling injection mold for a plastic hollow cabinet panel, comprising:

[0019] Retrieve product information, and retrieve product wall thickness and through-hole size information from the product information;

[0020] Matching the long core-pulling groove cross-section information and core-pulling cross-section information based on product wall thickness information and through-hole size information;

[0021] The long core-pulling groove of the mold base is processed according to the cross-sectional information of the long core-pulling groove;

[0022] Analyze the through hole dimensions to determine the location of the positioning component and the core-pulling length.

[0023] The core-pulling cross-section information and core-pulling length information are defined as core-pulling set information;

[0024] The dimensions of the positioning component are determined by combining the core-pulling assembly information and the cross-sectional information of the long core-pulling groove.

[0025] The positioning component is processed based on its position and size information.

[0026] The core-pulling set information is corrected using a preset theoretical correction method to obtain core-pulling theoretical correction information, and the core is processed based on the core-pulling theoretical correction information;

[0027] Set the baseline experimental environment temperature information, and use the baseline experimental environment temperature information to simulate the production environment for mold testing and processing.

[0028] By adopting the above technical solution, the relevant parameters of the mold are matched with the product information, and the relevant parameters of the mold are corrected in combination with the temperature influence factors. The mold reserves thermal expansion margin before the molten material is injected, so that the mold can expand to the normal state after being heated.

[0029] Optionally, methods for determining the dimensions of the positioning element include:

[0030] The positioning slot position information of the positioning component is matched with the embedding part position information according to the positioning slot position information preset at the core-pulling end;

[0031] Determine the droop information of the core-pulling end based on the core-pulling length information and the preset core-pulling material;

[0032] Based on the information of the drooping end of the core puller, the tilt dimension information of the front side of the embedded part is matched with the tilt correction information of the core puller.

[0033] The positioning part size information is output based on the position information of the embedded part and the tilt dimension information of the top of the embedded part tilting downward.

[0034] Optional mold application methods for cases involving expansion of the core-pulling section include:

[0035] Retrieve the total quantity of product materials;

[0036] Half of the total product material is injected into the mold at a preset injection speed, and the real-time temperature value of the core is collected after injection is completed.

[0037] Match the speed change based on the real-time temperature value of the core pulling process;

[0038] The injection speed is corrected by the change in speed to slow down the speed at which molten material is injected into the mold, while the injection of molten material into the mold continues;

[0039] When the real-time temperature of the core-pulling process reaches the reference temperature of the molten material, the remaining molten material is injected into the mold at the injection speed.

[0040] By adopting the above technical solution, a portion of the molten material is first injected into the mold to heat the mold through the temperature of the material, allowing the mold to expand thermally. Once the mold reaches thermal expansion equilibrium, the remaining molten material is then injected into the mold, resulting in a product with uniform wall thickness and high quality.

[0041] Optional mold usage methods for cases involving core-pulling length expansion include:

[0042] Set the installation position of the interceptor plate according to the size information of the positioning component;

[0043] Install the preset interceptor plate at the interceptor plate installation position, and control the interceptor plate to extend before the molten material is injected to hold the core puller circumferentially;

[0044] When the real-time temperature of the core puller reaches the reference temperature of the molten material, the intercepting plate is controlled to retract so that the molten material can flow to the contact position of the two core puller ends.

[0045] By adopting the above technical solution and setting up an interceptor plate, the interceptor plate can prevent the material from entering the end positions of the two core pullers when the molten material is injected, so that the ends of the two core pullers can be brought into contact due to thermal expansion, thus preventing the material from entering between the two core pullers and affecting the quality of the produced products.

[0046] Optional, also includes:

[0047] Collect the actual temperature of the molten material and the cylinder reaction force value;

[0048] When the actual temperature of the molten material is greater than the reference temperature value of the molten material, the difference between the actual temperature of the molten material and the reference temperature value of the molten material is calculated and defined as the temperature difference exceeding the reference temperature value.

[0049] The excess length value is determined based on the temperature difference, coefficient of thermal expansion, and core pulling length information.

[0050] When the cylinder reaction force is greater than 0, collect the bending deformation of the core pulling;

[0051] Set the deformation ratio, and determine the allowable deformation based on the deformation ratio and product wall thickness information;

[0052] The cylinder is retracted based on the length excess value only if the bending deformation of the core pulling exceeds the allowable deformation.

[0053] By adopting the above technical solution, when the actual temperature of the molten material exceeds the preset reference temperature value of the molten material, the cylinder can retract to adapt to the thermal expansion of the core pulling length, thus avoiding bending and deformation of the core pulling due to excessive thermal expansion under the constraint of both ends.

[0054] In summary, this application includes at least one of the following beneficial technical effects:

[0055] The core is divided into two parts and driven separately by a core pulling drive component, thereby shortening the length of a single core and reducing the deformation when the core enters the long core pulling slot. At the same time, a positioning component is installed in the middle of the long core pulling slot to position the cores on both sides, so that the cores can be in the preset position when they enter the long core pulling slot, thus ensuring that the gap between the core and the long core pulling slot is uniform.

[0056] After the two core pulls enter the long core pull slot, the positioning component can position the core pulls so that the two core pulls are aligned when they come into contact, and ensure that the gap between the core pulls and the long core pull slot is uniform.

[0057] When the core is pulled into the long core-pulling groove, the edge of the positioning groove can move along the inclined straightening front. When the core-pulling end moves to the top of the embedding part, the core is in a horizontal state. At this time, the gap between the core and the long core-pulling groove is evenly distributed. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the structure of the plastic hollow cabinet according to an embodiment of the present invention;

[0059] Figure 2 This is a schematic diagram of the overall structure of a long core-pulling injection molding mold for a plastic hollow cabinet panel according to an embodiment of the present invention;

[0060] Figure 3 This is a cross-sectional view of a long core-pulling injection molding die for a plastic hollow cabinet panel according to an embodiment of the present invention;

[0061] Figure 4 This is a schematic diagram of the positioning component according to an embodiment of the present invention;

[0062] Figure 5 This is a schematic diagram of the mating structure of the core-pulling and positioning components according to an embodiment of the present invention;

[0063] Figure 6 This is a schematic diagram of the installation position of the core-pulling cylinder on the mold base according to an embodiment of the present invention.

[0064] The parts referred to by the numbers in the above attached figures are as follows: 1. Plastic hollow cabinet panel; 2. Through hole; 3. Mold base; 31. Long core-pulling groove; 4. Core pulling; 41. Positioning groove; 42. Positioning cavity; 5. Core pulling drive assembly; 51. Core pulling cylinder; 52. Connector; 6. Injection molding channel; 7. Positioning component; 71. Embedded part; 72. Tilt correction front. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0066] This application discloses a long core-pulling injection molding mold for plastic hollow cabinet panels.

[0067] Reference Figure 1 In this embodiment, the plastic hollow cabinet panel 1 is a thin-walled panel structure with through holes 2 extending through both ends. The plastic hollow cabinet panel 1 is obtained by injection molding using a long core-pulling injection molding mold. Molten plastic is injected by placing the long core-pulling injection molding mold between a fixed mold and a moving mold. After the molten plastic cools, the plastic hollow cabinet panel 1 is obtained.

[0068] Reference Figure 2 The injection molding mold for long core-pulling of plastic hollow cabinet panels includes a mold base 3, a core-pulling part 4, and a core-pulling drive assembly 5. According to the product structure, long core-pulling grooves 31 are formed through both ends of the mold base 3, and the cross-section of the long core-pulling grooves 31 is trapezoidal. The core-pulling part 4 is a metal cylinder with the same trapezoidal cross-section as the long core-pulling groove 31, but the cross-sectional area of ​​the core-pulling part 4 is smaller than that of the long core-pulling groove 31.

[0069] Reference Figure 1 , Figure 2 and Figure 3 The core puller 4 is movably installed within the long core puller slot 31, and the core puller drive assembly 5 is used to drive the core puller 4 to move and extend within the long core puller slot 31. There is a uniformly wide injection molding channel 6 between the core puller 4 and the long core puller slot 31, which is used to generate the wall thickness of the through hole 2 of the plastic hollow cabinet panel 1 during injection molding.

[0070] In this embodiment, a long core-pulling slot 31 is provided with two core-pulling parts 4. Each core-pulling part 4 is driven by a separate core-pulling drive component 5. When both core-pulling parts 4 are inserted into the long core-pulling slot 31, the two core-pulling parts 4 abut against each other to form a core-pulling part 4 that is adapted to the length of the long core-pulling slot 31.

[0071] Reference Figure 2 , Figure 4 and Figure 5In order to enable the two core pullers 4 to be positioned when inserted into the long core puller slot 31, the mold base 3 is equipped with a positioning element 7 in the long core puller slot 31. The positioning element 7 is embedded in the middle of the long core puller slot 31. The positioning element 7 is made of metal and has an insert 71 with a T-shaped cross-section. The top of the insert has an inclined straightening surface 72 that is inclined downward.

[0072] Both core pullers 4 have positioning grooves 41 at their ends. When the ends of the two core pullers 4 abut, the two positioning grooves 41 combine to form a positioning cavity 42. When the core puller 4 is in the long core puller groove 31, the positioning member 7 is embedded and engaged with the positioning cavity 42, so that the core puller 4 can remain stable in the long core puller groove 31 during injection molding, thereby ensuring that the wall thickness of the plastic hollow cabinet panel 1 is uniform. Furthermore, since the core puller 4 is relatively long, the ends of the core puller 4 may droop. When the core puller 4 is inserted into the long core puller groove 31, the edge of the positioning groove 41 of the core puller 4 can move along the inclined straightening surface 72 of the insert 71 and abut against the top of the insert 71, thereby making the core puller 4 tend to be horizontal for position correction.

[0073] Reference Figure 2 and Figure 6 The core-pulling drive assembly 5 includes a core-pulling cylinder 51 and a connecting member 52. To reduce the overall volume of the molding die, the core-pulling cylinder 51 is installed within the forward projection range of the bottom surface of the die base 3, so that the core-pulling cylinder 51 does not protrude beyond the coverage area of ​​the die. The output ends of both core-pulling cylinders 51 are connected to the core-pulling 4 via connecting members 52, and the connecting members 52 are located at both ends of the die base 3.

[0074] When the core-pulling cylinder 51 extends, it drives the core-pulling 4 to exit from the long core-pulling groove 31, thereby performing the product ejection operation.

[0075] Based on the same inventive concept, embodiments of the present invention provide a method for producing and using a long core-pulling injection molding mold for plastic hollow cabinet panels.

[0076] A method for producing and using a long core-pulling injection mold for a plastic hollow cabinet panel includes the following steps:

[0077] Step 1: Retrieve product information, and retrieve product wall thickness and through-hole size information from the product information.

[0078] Product information refers to the complete set of design parameters for the injection-molded hollow plastic cabinet panel 1, including product wall thickness information, through-hole size information, etc. Product wall thickness information refers to the wall thickness of the hollow plastic cabinet panel 1 after molding. Through-hole size information refers to the width, height, length, and other dimensions of the through-holes 2 on the hollow plastic cabinet panel 1, which directly determine the cross-section and length of the core puller 4.

[0079] Product information is either manually entered into the system or pre-stored in the system, allowing for direct retrieval of product information from the system. The product information includes wall thickness and through-hole dimensions, thus these two features can be directly retrieved from the product information.

[0080] Step 2: Match the long core-pulling groove cross-section information and core-pulling cross-section information based on the product wall thickness information and through hole size information.

[0081] The cross-sectional information of the long core-pulling groove refers to the cross-sectional shape, length, width, and height parameters of the long core-pulling groove 31 on the mold base 3. The cross-sectional information of the core-pulling part refers to the cross-sectional shape, length, width, and height parameters of the core-pulling part 4 that mates with the long core-pulling groove 31.

[0082] The extracted product wall thickness and through-hole size information are input into the mold processing parameter matching database. Based on the pre-stored parameter correspondence, the system matches the long core-pulling groove cross-section information of mold base 3 and the core-pulling cross-section information of core-pulling 4. The mold processing parameter matching database is obtained from the test records preset by the technicians, and includes the correspondence between product wall thickness information, through-hole size information, long core-pulling groove cross-section information, and core-pulling cross-section information.

[0083] Step 3: Process the long core-pulling groove 31 of the mold base 3 according to the cross-sectional information of the long core-pulling groove.

[0084] Based on the matched cross-sectional information of the long core-pulling groove, the system controls the CNC milling equipment to precisely process the long core-pulling groove 31 of the mold base 3, ensuring that the cross-sectional dimensions of the groove are consistent with the cross-sectional information of the long core-pulling groove.

[0085] Step 4: Analyze the through hole size information to determine the location information of the positioning component and the core pulling length information.

[0086] The positioning component position information refers to the installation position of the positioning component 7 in the long core-pulling groove 31. This parameter is used to position and guide the core-pulling 4.

[0087] The core-pulling length information refers to the overall length value of core-pulling 4.

[0088] In this embodiment, since two core pullers 4 are provided and inserted from both ends of the long core pull groove 31, the positioning member 7 is installed in the exact middle of the long core pull groove 31. Once the through-hole size information is determined, the installation position of the positioning member 7 can be determined based on the length of the through-hole 2. Furthermore, the core pull length information is that the length of the through-hole 2 is half of its length.

[0089] Step 5: Define the core-pulling cross-section information and core-pulling length information as core-pulling set information.

[0090] The core-pulling cross-section information and core-pulling length information are integrated and defined as core-pulling set information, which serves as the complete parameter basis for core-pulling 4 processing.

[0091] Step 6: Determine the size information of the positioning component by combining the core-pulling assembly information and the cross-sectional information of the long core-pulling groove.

[0092] To ensure a uniform gap between the core puller 4 and the long core puller groove 31 when the ends of the two core pullers 4 abut, it is necessary to control the dimensions of the positioning member 7 to position the core puller 4. The positioning member dimension information refers to parameters such as the dimensions of the embedded part 71 and the dimensions of the tilt correction surface 72. The method for determining the positioning member dimension information will not be elaborated here, but will be described in detail in subsequent embodiments.

[0093] Step 7: Process the positioning component 7 according to the positioning component position information and positioning component size information.

[0094] Based on the position and size information of the positioning component, the system uses wire cutting and grinding equipment to customize the positioning component 7 to ensure the compatibility of the positioning component 7 with the core pulling 4 and the long core pulling groove 31.

[0095] Step 8: Correct the core-pulling set information using a preset theoretical correction method to obtain core-pulling theoretical correction information, and process core 4 based on the core-pulling theoretical correction information.

[0096] Because the molten material has a high temperature, the core-pulling mechanism 4 in the mold will deform and become dimensionally inaccurate. Therefore, it is necessary to introduce the influence of temperature during the processing of core-pulling mechanism 4 and correct its dimensions in advance. The theoretical correction information for core-pulling refers to the parameters obtained after correcting the core-pulling assembly information by incorporating the dimensional changes caused by temperature variations. The theoretical correction method is used to correct the parameters of the core-pulling assembly information. The theoretical correction method will not be elaborated here but will be described in detail in subsequent embodiments.

[0097] After completing the theoretical correction and obtaining the core-pulling theoretical correction information, the system processes core 4 according to the core-pulling theoretical correction information.

[0098] Step 9: Set the baseline experimental environment temperature information, and use the baseline experimental environment temperature information to simulate the production environment for mold testing and processing.

[0099] The baseline experimental environment temperature information is a temperature parameter set by technicians based on the conventional temperature value of the molten material.

[0100] The finished mold is installed on the injection molding machine, and the temperature of the mold is adjusted to the reference experimental environment temperature to simulate the actual production environment and verify the adaptability and processing accuracy of each part of the mold.

[0101] The method for determining the dimensional information of the positioning component includes the following steps:

[0102] Step 60: Match the position information of the embedded part of the positioning member 7 with the positioning groove position information of the positioning groove 41 at the end of the core puller 4.

[0103] The positioning slot location information refers to parameters such as the opening position, depth, and width of the positioning slot 41 on the core puller 4. The positioning slot location information is set by technicians based on the core puller cross-sectional information.

[0104] The insert 71 is a protruding structure on the positioning member 7 that mates with the positioning groove 41 of the core puller 4, and is the core part of the positioning member 7 for positioning. The insert position information refers to the setting position of the insert 71 on the positioning member 7.

[0105] The position information of the embedded part corresponds one-to-one with the position information of the positioning groove to meet the requirement of uniform gap between the core-pulling 4 and the long core-pulling groove 31. The system retrieves the position information of the positioning groove preset at the end of the core-pulling 4, and matches the position information of the embedded part of the positioning member 7 according to the position to ensure that the embedded part 71 and the positioning groove 41 are precisely engaged.

[0106] Step 61: Determine the droop information of the core pulling end based on the core pulling length information and the preset core pulling material.

[0107] The core-pulling material refers to the mold material used to manufacture core-pulling 4.

[0108] The information on the drooping end of the core pull refers to the deformation parameters such as the drooping distance and drooping angle of the free end of the core pull 4 due to its own weight.

[0109] The system uses the core-pulling length information and core-pulling material to calculate the sag information of the core-pulling end through a gravity sag simulation algorithm. The gravity sag simulation algorithm is an algorithm pre-programmed by technicians, which can simulate the free sag of the free end of the core-pulling 4 under different length conditions for different materials, and will not be elaborated here.

[0110] Step 62: Match the tilt dimension information of the front face 72 of the embedded part 71 with the tilt correction information of the core pulling end drooping information.

[0111] The tilt dimension information refers to parameters such as the downward tilt distance and tilt angle of the tilt correction face 72, which is set at the top of the embedding part 71 of the positioning member 7 to compensate for the drooping of the end of the core puller 4.

[0112] When the core puller 4 is inserted into the long core puller groove 31 and cooperates with the positioning member 7, the edge of the inner top surface of the positioning groove 41 of the core puller 4 first contacts the lowest point of the inclined straightening face 72 of the embedded part 71, and slides upward along the inclined straightening face 72. Finally, when the core puller 4 reaches the top of the embedded part 71, it is in a horizontal state. At this time, the gap between the core puller 4 and the long core puller groove 31 is uniform.

[0113] Based on the above conditions, the distance of the inner top surface of the positioning groove 41 can be obtained from the information of the drooping end of the core puller. The downward tilting distance of the front 72 can be obtained from the distance of the drooping inner top surface of the positioning groove 41. The tilting angle can be obtained from the size of the insert 71, and finally the tilting size information can be obtained.

[0114] Step 63: Output the positioning part size information based on the embedding part position information and the tilt dimension information of the top of the embedding part 71 tilting downward.

[0115] The system integrates the calculated embedding position information and tilt dimension information with the basic dimension information of the positioning component 7, and finally outputs the complete dimension information of the positioning component, which serves as the final basis for the processing of the positioning component 7.

[0116] The theoretical correction method includes the following steps:

[0117] Step 800: Retrieve the reference temperature value of the molten material.

[0118] The melt reference temperature refers to the standard temperature at which the plastic raw material melts during injection molding. This melt reference temperature is stored in the system's injection molding material database, and therefore can be directly retrieved from the database. The injection molding material database is a pre-entered parameter database for various injection molding materials by technical personnel, and will not be elaborated upon here.

[0119] Step 801: Match the coefficient of thermal expansion of the core-pulling material according to the reference temperature value of the molten material.

[0120] The coefficient of thermal expansion of the core-pulling material is an inherent physical property of the core-pulling material, which refers to the amount of expansion of the material when the temperature increases by 1°C.

[0121] The coefficient of thermal expansion changes with temperature and is directly proportional to the reference temperature of the molten material. The higher the reference temperature of the molten material, the greater the coefficient of thermal expansion.

[0122] Step 802: Calculate the thermal expansion of the cross section based on the core extraction cross section information and the coefficient of thermal expansion.

[0123] The cross-sectional thermal expansion refers to the amount of expansion of the core puller 4 in each direction due to thermal expansion at the reference temperature of the molten material. The cross-sectional thermal expansion can be calculated using the dimensional values ​​and coefficients of thermal expansion in each direction from the core puller cross-sectional information.

[0124] Step 803: Correct the core-pulling section information based on the cross-sectional thermal expansion to obtain core-pulling section correction information.

[0125] The core-pulling section correction information refers to the cross-sectional parameters of core-pulling section 4 after reverse correction based on the cross-sectional thermal expansion, compensating for the error in cross-sectional dimensions caused by thermal expansion. Here, the core-pulling section information refers to the dimensions of core-pulling section 4 after thermal expansion, while the core-pulling section correction information refers to the normal dimensions of core-pulling section 4 before thermal expansion. The core-pulling section correction information is obtained by subtracting the cross-sectional thermal expansion from the core-pulling section information.

[0126] Based on the calculated cross-sectional thermal expansion, the original core-pulling cross-sectional information is reversed to obtain core-pulling cross-sectional correction information, which compensates for the cross-sectional thermal expansion of core-pulling 4 during injection molding.

[0127] Step 804: Calculate the thermal expansion of the length based on the core length information and the coefficient of thermal expansion.

[0128] Consistent with the method in step 802, the length thermal expansion refers to the expansion distance of the core 4 due to thermal expansion at the reference temperature of the molten material. The length thermal expansion can be calculated using the core length information and the coefficient of thermal expansion.

[0129] Step 805: Correct the core-pulling length information based on the thermal expansion of the length to obtain core-pulling length correction information.

[0130] The core-pulling length correction information refers to the length parameter of core 4 after reverse correction for thermal expansion, compensating for the length dimension error caused by thermal expansion. Here, the core-pulling length information is the dimension of core 4 after thermal expansion, while the core-pulling length correction information is the normal dimension of core 4 before thermal expansion. The core-pulling length correction information is obtained by subtracting the thermal expansion amount from the core-pulling length information.

[0131] Based on the calculated thermal expansion of the length, the original core-pulling length information is reversed to obtain core-pulling length correction information, which compensates for the thermal expansion of the length of core-pulling 4 during injection molding.

[0132] This method is for preventing thermal expansion issues at the core-pulling section 4 during actual injection molding and must be implemented in the formal production process. The mold usage method for addressing expansion at the core-pulling section 4 includes the following steps:

[0133] Step 810: Retrieve the total amount of product materials.

[0134] The total product material quantity refers to the total mass of molten plastic raw material required to process a single piece of plastic hollow cabinet panel 1. The total product material quantity is pre-recorded in the system's database and can be retrieved directly from the system.

[0135] Step 811: Inject half of the total product material into the mold at a preset injection speed, and collect the real-time temperature value of the core after injection.

[0136] Injection speed is the mass of molten material injected into the mold by the injection molding machine per unit time. It is set by technicians according to actual production requirements and will not be elaborated here.

[0137] The real-time temperature value of the core pull refers to the actual temperature of the core pull 4 collected in real time during the injection molding process. The core pull 4 is equipped with a temperature sensor, which monitors the temperature of the core pull 4 in real time.

[0138] In this embodiment, the system first injects half of the total product material into the mold, thereby heating the core puller 4 by the temperature of the molten material. During this process, the core puller 4 undergoes thermal expansion, but since only half of the molten material is injected, the molten material will not overflow.

[0139] Step 812: Match the speed change based on the real-time temperature value of the core extraction.

[0140] The change in injection speed refers to the adjustment made to the original injection speed. Before the real-time core-pulling temperature reaches the reference temperature of the molten material, all the molten material cannot be injected into the mold; therefore, the injection speed needs to be reduced. The real-time core-pulling temperature is inversely proportional to the change in injection speed; the higher the real-time core-pulling temperature, the smaller the change in injection speed. Therefore, the injection speed curve in the graph shows a gradually decreasing value and a gradually decreasing slope.

[0141] Step 813: Correct the injection speed with the speed change to slow down the speed at which molten material is injected into the mold, and continue to inject molten material into the mold.

[0142] The system corrects the original injection speed with a matching speed change to slow down the injection speed of the molten material and continue to inject the remaining molten material into the mold.

[0143] Step 814: When the real-time temperature value of the core-pulling reaches the reference temperature value of the molten material, inject the remaining molten material into the mold at the injection speed.

[0144] When the real-time temperature value of the core-pulling device collected by the temperature sensor reaches the reference temperature information of the molten material, it indicates that the core-pulling section 4 has reached the maximum thermal expansion and tends to stabilize. The volume of the molding cavity of the mold no longer changes. At this time, the system controls the injection molding machine to inject all the remaining molten material into the mold at the initially preset injection speed to ensure injection efficiency and product molding quality.

[0145] This method is a control measure for thermal expansion issues along the 4-length of the core-pulling mold during actual injection molding. It is implemented in conjunction with the cross-sectional expansion control method. The mold usage method for addressing the 4-length expansion issue in core-pulling molds includes the following steps:

[0146] Step 820: Set the installation position of the interceptor plate according to the size information of the positioning component.

[0147] In this embodiment, intercepting plates are provided on the mold base 3, positioned on both sides of the positioning member 7, and are telescopically mounted on the groove wall of the long core-pulling groove 31. When the core-pulling 4 engages with the positioning member 7, the intercepting plates can extend from the groove wall of the long core-pulling groove 31 and encircle the core-pulling 4 from both sides. Since intercepting plates are provided on both sides of the positioning member 7, when the intercepting plates extend, the abutment position of the two core-pulling 4s is located between the two intercepting plates. Molten material will not enter between the two intercepting plates before the intercepting plates retract.

[0148] The interceptor mounting position refers to the installation location of the interceptor within the long core-pulling groove 31. The interceptor mounting positions are located on both sides of the positioning member 7, therefore the installation positions of the interceptor can be determined based on the size information of the positioning member.

[0149] Step 821: Install the preset interceptor plate at the interceptor plate installation position, and control the interceptor plate to extend before the molten material is injected to hold the core puller in four circumferential directions.

[0150] Before the molten material is injected into the mold, the core puller 4 enters the long core puller groove 31 and a length of thermal expansion is reserved between the two core pullers 4. Then, the pneumatic drive mechanism of the mold is controlled to drive the intercepting plate to extend, so that the intercepting plate hugs the core puller 4 from all sides, restricting the molten material from entering between the two core pullers 4, so that the two core pullers 4 can be contacted by thermal expansion.

[0151] Step 822: When the real-time temperature value of the core puller reaches the reference temperature value of the molten material, control the interceptor plate to retract so that the molten material can flow to the abutment position of the two core puller ends.

[0152] When the real-time temperature value of the core-pulling device collected by the temperature sensor reaches the reference temperature information of the molten material, the length expansion of the core-pulling device 4 reaches its maximum value and tends to stabilize. At this time, the pneumatic drive mechanism is controlled to drive the intercepting plate to retract, thereby releasing the circumferential restriction on the core-pulling device 4 and allowing the molten material to flow smoothly to the contact position at the ends of the two core-pulling devices 4, ensuring that the through hole 2 part of the plastic hollow cabinet panel 1 is formed completely without missing material.

[0153] In this embodiment, to address the issues of overheating expansion and bending deformation of the core-pulling 4 during injection molding, the following steps are also included:

[0154] Step 830: Collect the actual temperature of the molten material and the reaction force value of the cylinder.

[0155] The actual temperature of the molten material refers to the actual temperature of the molten material injected into the mold. This actual temperature is obtained by a temperature sensor installed on the injection molding machine.

[0156] The cylinder reaction force value refers to the reverse thrust generated by the core-pulling mechanism 4 on the mold drive cylinder due to thermal expansion and bending deformation. A pressure sensor is installed on the mold cylinder, and the cylinder reaction force value is obtained through the pressure sensor.

[0157] Step 832: When the actual temperature of the molten material is greater than the reference temperature value of the molten material, calculate the difference between the actual temperature of the molten material and the reference temperature value of the molten material, and define it as the temperature difference exceeding the limit.

[0158] If the actual temperature of the molten material is not greater than the reference temperature of the molten material, this is the case where they are consistent. In this case, the ends of the two core pullers can fit together due to thermal expansion of their length, which is normal.

[0159] If the actual temperature of the molten material is greater than the reference temperature, the thermal expansion of the core puller 4 will exceed the theoretically calculated thermal expansion. In this case, the gap between the ends of the two core pullers 4 is insufficient for the core pullers 4 to expand thermally, which may cause the shaft to bend during expansion, resulting in uneven product wall thickness. This problem needs to be addressed. Therefore, the excess temperature difference needs to be calculated using the actual temperature and the reference temperature of the molten material.

[0160] Step 833: Determine the excess length value based on the temperature difference, thermal expansion coefficient, and core pulling length information.

[0161] The excess length value refers to the additional length expansion of core puller 4 caused by the molten material exceeding the temperature. The excess length value is the product of the temperature difference, the coefficient of thermal expansion, and the core puller length information.

[0162] Step 834: When the cylinder reaction force value is greater than 0, collect the bending deformation of the core pulling.

[0163] The bending deformation of the core pull refers to the bending deformation of the core pull 4 caused by thermal expansion. When both ends of the core pull 4 are constrained and thermal expansion continues along its length, the middle part of the core pull 4 will bend in the direction perpendicular to its length. A displacement sensor is installed on the core pull 4 to measure and collect the bending deformation.

[0164] When the cylinder reaction force is not greater than 0, it means that although the two core pullers 4 are in contact with each other, they are not squeezed together due to thermal expansion.

[0165] When the cylinder reaction force is greater than 0, it indicates that the two core pullers 4 are pressing against each other due to thermal expansion. Core pullers 4 will be deformed. At this time, the bending deformation of the core pullers is collected.

[0166] Step 835: Set the deformation ratio and determine the allowable deformation based on the deformation ratio and product wall thickness information.

[0167] The deformation ratio is the ratio of the bending deformation during core pulling to the product wall thickness. It is a parameter set by the technicians and represents the maximum threshold ratio for bending deformation.

[0168] The allowable deformation is the maximum permissible value for the deformation during core pulling and bending. Exceeding this value will affect the product molding quality and cause uneven wall thickness. The allowable deformation is the product of the deformation ratio and the product wall thickness information.

[0169] Step 836: Control the cylinder to retract if and only if the bending deformation of the core pulling is greater than the allowable deformation.

[0170] If the bending deformation of the core pull is not greater than the allowable deformation, the bending deformation of core pull 4 will not affect the product quality and no intervention is required.

[0171] When the bending deformation of the core pull exceeds the allowable deformation, it indicates that the bending of the core pull 4 has affected the product molding quality. The system controls the cylinder of the mold to retract according to the calculated excess length value to compensate for the extra length expansion of the core pull 4, eliminate the bending deformation force, and ensure the product molding accuracy.

[0172] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A long core-pulling injection molding mold for a hollow plastic cabinet panel, comprising a mold base (3) having a long core-pulling groove (31) extending through both ends of the mold base (3), characterized in that, It also includes a puller (4) that is movable and installed in the long puller slot (31) and a puller drive assembly (5) that drives the puller (4) to insert or withdraw from the long puller slot (31). Two core pullers (4) are provided corresponding to one of the long core pullers (31), and the two core pullers (4) are inserted from both ends of the long core puller (31); The long core-pulling groove (31) is provided with a positioning element (7) for positioning the ends of the two cores (4), and a uniformly wide injection molding channel (6) is formed between the cores (4) and the long core-pulling groove (31). The positioning member (7) has a T-shaped insert (71), and both ends of the two core pullers (4) have positioning grooves (41) and the ends of the two abut against each other to form a positioning cavity (42) for the insert (71) to be fully inserted; when the insert (71) is located in the positioning cavity (42), the circumferential sidewall of the core puller (4) is separated from the inner wall of the long core puller groove (31) to form the injection molding channel (6). The top of the embedding part (71) has a downward tilting correction surface (72), and the positioning groove (41) moves along the tilting correction surface (72) and abuts against the top of the embedding part (71) to perform position correction.

2. The long core-pulling injection molding mold for a hollow plastic cabinet panel according to claim 1, characterized in that, The core-pulling drive assembly (5) includes a core-pulling cylinder (51) and a connector (52); the connector (52) connects the output end of the core-pulling cylinder (51) and the core (4); the core-pulling cylinder (51) is installed within the forward projection range of the bottom surface of the mold base (3).

3. A method for producing and using a long core-pulling injection mold for a plastic hollow cabinet panel, applied to the long core-pulling injection mold for a plastic hollow cabinet panel as described in claim 2, characterized in that... include: Retrieve product information, and retrieve product wall thickness and through-hole size information from the product information; Matching the long core-pulling groove cross-section information and core-pulling cross-section information based on product wall thickness information and through-hole size information; The long core-pulling groove (31) of the mold base (3) is processed according to the cross-sectional information of the long core-pulling groove; Analyze the through hole dimensions to determine the location of the positioning component and the core-pulling length. The core-pulling cross-section information and core-pulling length information are defined as core-pulling set information; The dimensions of the positioning component are determined by combining the core-pulling assembly information and the cross-sectional information of the long core-pulling groove. The positioning component (7) is processed according to its position and size information; The core-pulling set information is corrected using a preset theoretical correction method to obtain core-pulling theoretical correction information, and the core (4) is processed based on the core-pulling theoretical correction information; Set the baseline experimental environment temperature information, and use the baseline experimental environment temperature information to simulate the production environment for mold testing and processing.

4. The method for producing and using a long core-pulling injection molding die for a plastic hollow cabinet panel according to claim 3, characterized in that, Methods for determining the dimensions of positioning components include: The positioning information of the positioning groove (41) at the end of the core puller (4) is matched with the position information of the embedded part of the positioning component (7); Determine the droop information of the core-pulling end based on the core-pulling length information and the preset core-pulling material; Based on the information of the drooping end of the core-pulling part, the tilt size information of the tilt correction front (72) of the embedded part (71) is matched with the tilt correction front (72); The positioning part size information is output based on the position information of the embedded part and the tilt size information of the top of the embedded part (71) tilting downward.

5. The method for producing and using a long core-pulling injection molding die for a plastic hollow cabinet panel according to claim 3, characterized in that, Theoretical corrective methods include: Retrieve the reference temperature value of the molten material; Match the coefficient of thermal expansion of the core-pulling material according to the reference temperature value of the molten material; Calculate the thermal expansion of the cross section based on the core-pulling section information and the coefficient of thermal expansion. The core-pulling section correction information is obtained by correcting the core-pulling section information based on the cross-sectional thermal expansion. Calculate the thermal expansion of the length based on the core-pulling length information and the coefficient of thermal expansion. The core-pulling length correction information is obtained by correcting the core-pulling length information based on the thermal expansion of the length.

6. The method for producing and using a long core-pulling injection molding die for a plastic hollow cabinet panel according to claim 5, characterized in that, The mold usage methods for core pulling (4) section expansion include: Retrieve the total quantity of product materials; Half of the total product material is injected into the mold at a preset injection speed, and the real-time temperature value of the core is collected after injection is completed. Match the speed change based on the real-time temperature value of the core pulling process; The injection speed is corrected by the change in speed to slow down the speed at which molten material is injected into the mold, while the injection of molten material into the mold continues; When the real-time temperature of the core-pulling process reaches the reference temperature of the molten material, the remaining molten material is injected into the mold at the injection speed.

7. The method for producing and using a long core-pulling injection molding die for a plastic hollow cabinet panel according to claim 6, characterized in that, The mold usage methods for the length expansion of the core-pulling (4) include: Set the installation position of the interceptor plate according to the size information of the positioning component; Install the preset interceptor plate at the interceptor plate installation position, and control the interceptor plate to extend before the molten material is injected to hold the core puller (4) circumferentially; When the real-time temperature of the core puller reaches the reference temperature of the molten material, the intercepting plate is controlled to retract so that the molten material can flow to the end contact position of the two core pullers (4).

8. The method for producing and using a long core-pulling injection molding die for a plastic hollow cabinet panel according to claim 7, characterized in that, Also includes: Collect the actual temperature of the molten material and the cylinder reaction force value; When the actual temperature of the molten material is greater than the reference temperature value of the molten material, the difference between the actual temperature of the molten material and the reference temperature value of the molten material is calculated and defined as the temperature difference exceeding the reference temperature value. The excess length value is determined based on the temperature difference, coefficient of thermal expansion, and core pulling length information. When the cylinder reaction force is greater than 0, collect the bending deformation of the core pulling; Set the deformation ratio, and determine the allowable deformation based on the deformation ratio and product wall thickness information; The cylinder is retracted based on the length excess value only if the bending deformation of the core pulling exceeds the allowable deformation.

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