A chair armrest side plate injection mold hot runner glue feeding control method and mold thereof

Abstract

The present application relates to a kind of chair armrest side plate injection mold hot runner glue feeding control method and its mold, it relates to injection mold technical field, it includes: in response to the mold completion signal, product information, cavity information and glue feeding position are collected;According to cavity information, determine flow rate threshold, glue feeding duration and the glue feeding component corresponding to glue feeding position;Determine glue feeding flow rate by combining product information, glue feeding component and glue feeding duration;The glue feeding position corresponding to the glue feeding flow rate greater than flow rate threshold is defined as exceeding position, and the glue feeding position adjacent to exceeding position is defined as adjacent position;Adjacent relationship of exceeding position is obtained;Based on adjacent relationship, glue feeding flow rate is corrected;The operating unit is controlled to run by combining corrected glue feeding flow rate and glue feeding duration.The present application has the effect of avoiding product to appear weld mark obvious, local shrinkage mark and other quality defects.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and in particular to a method for controlling the hot runner injection of a chair armrest side panel injection mold and the mold thereof. Background Technology

[0002] Injection molds, as the core equipment for mass production of plastic parts, are the key carrier connecting material formulation, molding process and end product. Their technical level directly determines the molding accuracy, production efficiency and manufacturing cost of plastic products.

[0003] For chair armrest side panels, the mainstream injection molds in the industry currently adopt a multi-inlet uniform flow rate injection design: in order to adapt to a larger molding area, multiple gates are evenly arranged in the mold, and the flow parameters, heating power and flow rate settings of each gate are completely consistent.

[0004] However, as irregularly shaped parts, the chair armrest side panels have different requirements for melt filling flow rate and pressure in different areas of the injection mold. The method of uniformly feeding through multiple feed ports will lead to an imbalance in the filling of molten plastic, resulting in quality defects such as obvious weld lines and local shrinkage marks in the product. Summary of the Invention

[0005] To avoid quality defects such as obvious weld lines and local shrinkage marks in products, this invention provides a method for controlling the hot runner injection of glue into a chair armrest side panel injection mold and the mold thereof.

[0006] In a first aspect, the present invention provides a method for controlling the hot runner injection of a chair armrest side panel injection mold, which adopts the following technical solution:

[0007] A method for controlling the hot runner injection of a chair armrest side panel injection mold, comprising:

[0008] Step 1: In response to the mold closing completion signal, collect product information, cavity information, and injection position;

[0009] Step 2: Determine the flow rate threshold, injection time, and injection component corresponding to the injection position based on the cavity information;

[0010] Step 3: Determine the glue flow rate based on product information, glue quantity, and glue dispensing time;

[0011] Step 4: Define the injection position corresponding to the injection rate that is greater than the flow rate threshold as the out-of-range position, and define the injection position adjacent to the out-of-range position as the adjacent position;

[0012] Step 5: Obtain the adjacency relationships of the locations exceeding the standard;

[0013] Step 6: Adjust the glue flow rate based on the adjacency relationship;

[0014] Step 7: Combine the corrected glue feed rate and glue feed duration to control the operation of the execution unit.

[0015] By adopting the above technical solution, multi-dimensional parameters are collected and flow rate thresholds and injection parameters are determined based on the differentiated requirements of the molding cavity. Then, the injection flow rate is dynamically corrected by identifying the out-of-range locations and determining the adjacent relationships, so as to achieve precise matching of the injection flow rate at each injection location and effectively avoid defects such as obvious weld lines and local shrinkage caused by uneven flow rates.

[0016] Optionally, methods for correcting the injection flow rate based on adjacency relationships include:

[0017] Step 60: Calculate the excess value based on the glue inlet flow rate and flow rate threshold corresponding to the excess location;

[0018] Step 61: If there are no adjacent positions between the positions that exceed the standard, use the flow rate threshold as the glue injection flow rate for the position that exceeds the standard;

[0019] Step 62: Obtain the number of adjacent positions at the out-of-limit locations;

[0020] Step 63: Adjust the glue flow rate corresponding to the adjacent positions by combining the adjacent quantities and the excess value.

[0021] By adopting the above technical solution, the flow velocity exceeding the standard value at the exceeding location is quantitatively calculated and the flow velocity at the adjacent location is adjusted in a targeted manner according to the adjacent quantity. This realizes the control logic of reasonably transferring the exceeding value to the adjacent location, avoiding the direct reduction of velocity at a single exceeding location, which would lead to insufficient local filling.

[0022] Optionally, methods for correcting the injection flow rate based on adjacency relationships also include:

[0023] Step 64: If there are adjacent positions that exceed the standard, define the larger exceeding value among the adjacent exceeding positions as the downward adjustment value;

[0024] Step 65: Obtain the number of consecutive adjacent positions that exceed the limit;

[0025] Step 66: Adjust the coefficient based on continuous quantity matching;

[0026] Step 67: Adjust the glue injection rate by combining the adjustment value and adjustment coefficient;

[0027] Step 68: Adjust the injection time based on the corrected injection flow rate, product information, and injection quantity.

[0028] By adopting the above technical solution, for consecutive adjacent locations exceeding the standard, the adjustment coefficient is matched with the maximum exceeding value and the consecutive number to achieve synchronous adjustment of the glue injection position, avoiding excessive accumulation of flow rate in consecutive exceeding areas. At the same time, the filling efficiency loss after the flow rate is adjusted is compensated by synchronously correcting the glue injection time.

[0029] Optionally, methods for correcting the glue flow rate at adjacent positions include:

[0030] Step 630: Obtain the flow cross-sectional area between the out-of-range location and the adjacent location based on the cavity information;

[0031] Step 631: When an adjacent position is only adjacent to one position exceeding the limit, determine the adjacent lower limit based on the glue injection position;

[0032] Step 632: If the adjacent quantity is consistent with the adjacent lower limit, sum the glue injection rate of the adjacent position with the excess value to obtain the corrected glue injection rate;

[0033] Step 6330: If the adjacent quantity is inconsistent with the adjacent lower limit, calculate the allocation ratio by combining the glue inlet flow rate and flow cross-sectional area corresponding to the adjacent position;

[0034] Step 6331: Calculate the allocation value based on the allocation ratio and the excess value;

[0035] Step 6332: Sum the glue flow rate of adjacent positions with the allocation value to obtain the corrected glue flow rate.

[0036] By adopting the above technical solution and combining the flow cross-sectional area calculation of the excess position and the adjacent position, the excess value allocation is positively correlated with the flow channel transmission capacity, ensuring that the melt can be accurately replenished at the excess position after the flow velocity of the adjacent position is corrected.

[0037] Optionally, the method for correcting the glue flow rate at adjacent positions also includes:

[0038] Step 634: When an adjacent position is adjacent to multiple non-compliant positions, calculate the total amount of non-compliant items based on the glue injection flow rate and flow rate threshold corresponding to the non-compliant position;

[0039] Step 635: Determine the corrected flow rate by combining the total excess amount and the glue flow rate at adjacent locations;

[0040] Step 636: When the corrected flow rate is greater than the flow rate threshold, obtain pipe information and coil information;

[0041] Step 637: Calculate the excess velocity difference based on the corrected flow velocity and the flow velocity threshold;

[0042] Step 638: Combine the glue inlet position, the speed difference exceeding the standard, the pipeline information and the coil information to determine the pulse command and execute it synchronously when the execution unit is running. Use the flow rate threshold as the glue inlet flow rate of the adjacent position.

[0043] By adopting the above technical solution, when the corrected flow rate exceeds the standard due to the proximity of multiple exceeding positions, an electromagnetic pulse module is introduced to reduce resistance and increase speed. This reduces the flow resistance without changing the melt temperature, ensuring that the flow rate at adjacent positions is controlled within the threshold and avoiding insufficient filling.

[0044] Optionally, the methods for determining the pulse command include:

[0045] Step 6380: Obtain the outer diameter and material of the pipe from the pipe information, and obtain the initial position, inner diameter and density of the coil from the coil information;

[0046] Step 6381: Determine the pulse interval by combining the outer diameter of the pipe and the inner diameter of the coil;

[0047] Step 6382: Determine the correction factor based on the pipe material and pulse interval;

[0048] Step 6383: Determine the fundamental frequency and fundamental current based on the speed difference exceeding the standard;

[0049] Step 6384: Calculate the target frequency and target current by combining the base frequency, base current, and correction factor;

[0050] Step 6385: Determine the movement path based on the target current, coil density, initial position, and glue injection position;

[0051] Step 6386: Integrate the movement path, target frequency, and target current to determine the pulse command.

[0052] By adopting the above technical solution, the movement path, target frequency and target current are integrated to generate standardized pulse commands. Based on the pipe material, coil characteristics and the speed difference exceeding the standard, the target frequency and target current are dynamically matched to ensure that the magnetic field strength and the pipe vibration amplitude are adapted.

[0053] Optional method for determining the movement path:

[0054] Step 6390: Determine the alignment path based on the initial position and the glue injection position;

[0055] Step 6391: Determine the number of coil turns based on pipeline information, target current, and pulse spacing;

[0056] Step 6392: Determine the insertion length by combining the number of coil turns and the coil density;

[0057] Step 6393: Determine the move path based on the alignment path and insertion length.

[0058] By adopting the above technical solution, the radial alignment path and axial insertion length are segmented and integrated to realize the movement of the coil from the initial position to the target position of the pipe. By combining the number of coil turns and the coil density to match the insertion length, the coil sleeve length is adapted to the required number of turns of the required magnetic field strength.

[0059] Optionally, methods for determining the number of coil turns include:

[0060] Step 63910: Obtain the permeability and target magnetic field strength from the pipeline information;

[0061] Step 63911: Determine the magnetic field attenuation coefficient based on the pulse spacing and permeability;

[0062] Step 63912: Determine the total magnetic field requirement by combining the magnetic field attenuation coefficient, the target magnetic field strength, and the pulse spacing;

[0063] Step 63913: Calculate the efficiency factor based on the permeability and target current;

[0064] Step 63914: Determine the number of coil turns based on the total magnetic field demand and efficiency factor.

[0065] By adopting the above technical solutions, and combining the pipeline's magnetic permeability with pulse spacing to compensate for magnetic field attenuation, the vibration amplitude of the pipeline is ensured to remain stable within the optimal drag reduction range. The number of turns is optimized by the efficiency factor to avoid drag reduction failure caused by insufficient number of turns.

[0066] Secondly, this application provides an injection mold for a chair armrest side panel, which adopts the following technical solution.

[0067] An injection mold for a chair armrest side panel includes a mold body having a molding cavity and multiple injection channels, and a flow rate control structure for controlling the flow rate of molten plastic entering the molding cavity through the injection channels;

[0068] One end of the glue inlet channel is connected to the molding cavity, and the other end of the glue inlet channel is connected to an external feeding device. The glue inlet channel is used to allow molten plastic to pass through.

[0069] The flow rate control structure includes an execution unit for regulating the flow rate of molten plastic in different glue inlet channels and a control unit for controlling the execution unit;

[0070] The execution unit is installed at the inlet of the glue inlet channel, and the control unit is electrically connected to the execution unit.

[0071] By adopting the above technical solution, the mold body is equipped with multiple glue inlet channels to adapt to the irregular cavity of the chair armrest side panel. The execution unit responds to the control unit's instructions in real time to adjust the flow rate in different glue inlet channels, thus solving the problem that traditional molds cannot adapt to the differentiated needs of multiple areas.

[0072] Optionally, the molding cavity is further provided with a first core that is slidably connected to the mold body, and the mold body is further provided with a core-pulling structure for driving the first core to move.

[0073] The core-pulling structure includes a first sliding frame mounted on the mold body, a first slider mounted on the first sliding frame for limiting and sliding, and a first push-pull unit fixedly mounted on the first slider;

[0074] The output end of the first push-pull unit is fixedly connected to the mold body, and the driving direction of the first push-pull unit, the extension direction of the first core, and the sliding direction of the first core are all the same.

[0075] By adopting the above technical solution, the core-pulling structure drives the first core to slide along a specific direction, which adapts to the molding requirements of irregular structures in the molding cavity while reducing the demolding difficulty. In addition, the first push-pull unit, the first slider and the first core move synchronously, reducing the axial length of the first push-pull unit when it is not working, which facilitates installation and reduces the overall space occupied by the mold.

[0076] In summary, the present invention has at least one of the following beneficial technical effects:

[0077] By identifying locations exceeding the standard and determining adjacent relationships, the glue injection flow rate is dynamically corrected to achieve precise matching of the glue injection flow rate at each injection location, effectively avoiding defects such as obvious weld lines and local shrinkage caused by uneven flow rates.

[0078] When the corrected flow rate exceeds the limit due to being adjacent to multiple exceeding positions, an electromagnetic pulse module is introduced to reduce drag and increase speed. This reduces flow resistance without changing the melt temperature, ensuring that the flow rate at adjacent positions is controlled within the threshold while avoiding insufficient filling.

[0079] The main body of the mold is equipped with multiple injection channels to adapt to the irregular cavity of the chair armrest side panel. The execution unit responds to the control unit's instructions in real time to adjust the flow rate in different injection channels, solving the problem that traditional molds cannot adapt to the differentiated needs of multiple areas. Attached Figure Description

[0080] Figure 1 This is a structural schematic diagram of an injection mold for a chair armrest side panel according to this application;

[0081] Figure 2 This is a partial structural diagram of an injection mold for a chair armrest side panel according to this application. Figure 1 ;

[0082] Figure 3 This is a cross-sectional view of an injection mold for a chair armrest side panel according to this application;

[0083] Figure 4 This is a partial structural diagram of an injection mold for a chair armrest side panel according to this application. Figure 2 ;

[0084] Figure 5 This application describes a process for controlling the hot runner injection of a chair armrest side panel in an injection mold. Figure 1 ;

[0085] Figure 6 This application describes a process for controlling the hot runner injection of a chair armrest side panel in an injection mold. Figure 2 .

[0086] The parts referred to by the numbers in the above attached figures are as follows: 1. Mold body; 11. Molding cavity; 12. Glue inlet channel; 13. First core; 14. Second core; 2. Flow rate control structure; 21. Execution unit; 22. Control unit; 3. Core pulling structure; 31. First sliding frame; 32. First slider; 33. First push-pull unit; 34. Second sliding frame; 35. Second push-pull unit. Detailed Implementation

[0087] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0088] This invention discloses an injection mold for a chair armrest side panel.

[0089] Reference Figure 1 , Figure 2 and Figure 3 A chair armrest side panel injection mold includes a mold body 1 with a molding cavity 11 and three injection channels 12, a flow rate control structure 2 and a core pulling structure 3. The mold body 1 has two first cores 13 and second cores 14 installed in an upper limit sliding position.

[0090] One end of the inlet channel 12 is connected to the molding cavity 11, and the other end of the inlet channel 12 is connected to the external feeding equipment. The inlet channel 12 is used to allow molten plastic to pass through and enter the molding cavity 11.

[0091] The flow rate control structure 2 is provided with three sets corresponding to the glue inlet channel 12. Each set of flow rate control structure 2 includes an execution unit 21 and a control unit 22.

[0092] The execution unit 21 is fixedly installed at the inlet of the glue inlet channel 12 to regulate the temperature of the molten plastic in the glue inlet channel 12, thereby changing the viscosity of the molten plastic and thus controlling the flow rate of the molten plastic. The execution unit 21 integrates a heating element and a thermocouple.

[0093] The control unit 22 is fixedly installed on the outside of the mold body 1 and electrically connected to the corresponding execution unit 21. The control unit 22 is used to perform electrical control on the execution unit 21. The control unit 22 contains a PID control circuit and a signal conversion interface that correspond one-to-one with the execution unit 21.

[0094] The first core 13 and the second core 14 are located inside the molding cavity 11. The first core 13, the second core 14 and the molding cavity 11 constitute a chamber with a shape and size corresponding to the product. The two first cores 13 are arranged in parallel.

[0095] Reference Figure 1 and Figure 4 The core-pulling structure 3 includes a first sliding frame 31, a first slider 32, a first push-pull unit 33, a second sliding frame 34, and a second push-pull unit 35.

[0096] The first sliding frame 31 is fixedly installed on the side wall of the mold body 1 near the first core 13. The first slider 32 is limited and slidably installed on the first sliding frame 31. The first slider 32 is fixedly connected to both first cores 13. The fixed end of the first push-pull unit 33 is fixedly installed on the first slider 32. The output end of the first push-pull unit 33 is fixedly connected to the mold body 1. The driving direction of the first push-pull unit 33, the extension direction of the first core 13, and the sliding direction of the first core 13 are all the same.

[0097] The second sliding frame 34 is fixedly installed on the side wall of the mold body 1 near the second core 14. The second push-pull unit 35 is fixedly installed on the second sliding frame 34. The output end of the second push-pull unit 35 is fixedly connected to the second core 14. The driving direction of the second push-pull unit 35, the extension direction of the second core 14, and the sliding direction of the second core 14 are all the same.

[0098] Both the first push-pull unit 33 and the second push-pull unit 35 use hydraulic cylinders.

[0099] After the mold body 1 is closed, the external material supply equipment is activated and molten plastic is injected into the molding cavity 11 through the injection channel 12. At the same time, the control unit 22 drives the execution unit 21 to control the temperature of the corresponding injection channel 12, thereby changing the viscosity of the molten plastic and thus controlling the flow rate of the molten plastic. After the molten plastic cools and solidifies and the mold is opened, the first push-pull unit 33 and the second push-pull unit 35 are activated. The first push-pull unit 33 drives the first slider 32 to move away from the product along the first sliding frame 31. The first slider 32 drives the first core 13 to slide along the mold body 1 and separate from the product. The second push-pull unit 35 drives the second core 14 to slide along the mold body 1 and separate from the product, which facilitates the subsequent demolding and material removal of the product.

[0100] Based on the same inventive concept, embodiments of the present invention provide a method for controlling the hot runner injection of glue into an injection mold for a chair armrest side panel.

[0101] Reference Figure 5 A method for controlling the hot runner injection of a chair armrest side panel injection mold, comprising the following steps:

[0102] Step 1: In response to the mold closing completion signal, collect product information, cavity information, and injection position.

[0103] The mold closing completion signal refers to the signal that triggers the injection control process after the injection mold completes the mold closing process; the mold closing data is collected by the limit switch installed on the mold body 1 and the system outputs the mold closing completion signal.

[0104] Product information refers to the structural parameters and material and process parameters of the chair armrest side panels. Structural parameters such as product dimensions are extracted from the 3D product design drawings, material types are obtained from the material supplier's product technical report, and parameters such as melt flow index and melt viscosity are obtained from the corresponding table according to the material type. These parameters are pre-integrated and entered into the system by the staff.

[0105] Cavity information refers to the structural and process parameters of the molding cavity 11 and the injection runner 12 of the injection mold; the geometric dimensions, number and distribution of gates of each area are extracted from the three-dimensional drawings of the product design, and the staff integrates and enters them into the system in advance.

[0106] The injection position refers to the precise location of the gate in the injection channel 12; based on the coordinate system reference point set by the mold body 1, the three-dimensional coordinate position of each gate is collected by the laser positioning sensor, that is, the injection position.

[0107] Step 2: Determine the flow rate threshold, injection time, and injection component corresponding to the injection position based on the cavity information.

[0108] The flow rate threshold refers to the maximum allowable flow rate of molten plastic in the cavity area corresponding to each injection point under the influence of temperature. It is calibrated through orthogonal mold trial experiments. Multiple sets of temperature parameters are set for different cavity areas for mold trials. The maximum value that temperature can affect the flow rate is taken as the flow rate threshold, which is pre-integrated into the cavity information and entered into the system.

[0109] The injection time refers to the baseline time to ensure that the molten plastic can be filled smoothly. Through preliminary mold trials, the optimal injection time corresponding to different product information combinations is collected, a correlation library between product information and injection time is established, and the information is pre-integrated into the cavity information and entered into the system.

[0110] The injection volume refers to the volume of molten plastic that needs to be injected into the corresponding cavity area at each injection point. The volume of each cavity area is measured and calculated by measuring the 3D drawings of the mold design. If the volume ratio of the cavity area is consistent with the proportion of the injection volume, then the cavity area volume is consistent with the injection volume. This information is pre-integrated into the cavity information and entered into the system.

[0111] Step 3: Determine the glue flow rate by combining product information, glue quantity, and glue injection time.

[0112] The injection flow rate refers to the theoretical melt volume flow rate corresponding to the injection position. The product material is read from the product information, and the flow correction factor is determined according to the product material. For example, 0.95 is used for high-flow PP material and 1.05 is used for low-flow ABS material. Then, it is calculated according to the formula: Injection flow rate = Injection component × Flow correction factor ÷ Injection time.

[0113] Step 4: Define the injection position corresponding to the injection rate that is greater than the flow rate threshold as the out-of-range position, and define the injection position adjacent to the out-of-range position as the adjacent position.

[0114] The out-of-range position refers to the gate position where the injection flow rate exceeds its corresponding flow rate threshold. At this time, there is a risk of turbulence in the molding cavity 11. The injection flow rate value is compared with the flow rate threshold value to determine the injection flow rate that is greater than the flow rate threshold. The corresponding injection position is the out-of-range position.

[0115] Adjacent positions refer to gate positions adjacent to the non-compliant positions. Their corresponding cavity areas are adjacent to and connected to the cavity areas corresponding to the non-compliant positions. Based on the 3D drawings of the mold design, the adjacency list of each gate is pre-detected and set. When a non-compliant position is identified, the adjacent positions are automatically filtered from the adjacency list.

[0116] In this embodiment, adjacent positions are relative. For example, if the first gate and the second gate are arranged in sequence, and the second gate is an out-of-range position, the first gate is adjacent to the second gate, but this does not mean that the first gate is necessarily adjacent.

[0117] Step 5: Obtain the adjacency relationships of the locations that exceed the standard.

[0118] Adjacent relationship refers to whether there are adjacent positions between the positions that exceed the standard. This includes situations where the positions exceeding the standard are adjacent or not adjacent. When there is only one position exceeding the standard, it is considered a non-adjacent situation.

[0119] Step 6: Adjust the glue flow rate based on the adjacency relationship.

[0120] The methods for adjusting the glue flow rate vary depending on the different adjacent relationships. The specific adjustment methods will be explained in detail in the following steps, and will not be repeated here.

[0121] refer to Figure 6 The method for correcting the glue flow rate based on the adjacency relationship includes the following steps:

[0122] Step 60: Calculate the excess value based on the glue inlet flow rate and flow rate threshold corresponding to the excess location.

[0123] The excess value refers to the difference between the glue inlet flow rate at the excess location and its corresponding flow rate threshold. The excess value, glue inlet flow rate, flow rate threshold, and excess location are calculated by subtracting the glue inlet flow rate from the flow rate threshold.

[0124] Step 61: If there are no adjacent positions between the positions that exceed the standard, use the flow rate threshold as the glue injection flow rate for the position that exceeds the standard.

[0125] The adjacency relationship is that there are no adjacent positions between the positions that exceed the standard. The adjacent positions of the positions that exceed the standard are not considered to be in the case of exceeding the standard. The adjacent positions of the positions that exceed the standard are determined according to the adjacency list, and it is compared to ensure that there are no duplicate adjacent positions and positions that exceed the standard.

[0126] Step 62: Obtain the number of adjacent positions of the out-of-limit location.

[0127] The number of adjacent gates refers to the total number of gates that are adjacent to a single out-of-specification location. The number of gates corresponding to the out-of-specification location is retrieved from the adjacency table, and the specific value is output, which is the number of adjacent gates.

[0128] Step 63: Adjust the glue flow rate corresponding to the adjacent positions by combining the adjacent quantities and the excess value.

[0129] Based on different adjacent quantities, the flow rate of glue at the corresponding adjacent position is corrected by the excess value at the excess position. The specific correction method will be explained in detail in the following steps, and will not be repeated here.

[0130] In this embodiment, by changing the injection flow rate at adjacent positions, the melt entering the molding cavity 11 through the corresponding gate at the adjacent position can naturally flow to the position exceeding the standard, thereby reducing the injection load at the position exceeding the standard, and thus reducing the injection flow rate at the position exceeding the standard so that the injection flow rate meets the standard.

[0131] The method for correcting the glue flow rate at adjacent positions includes the following steps:

[0132] Step 630: Obtain the flow cross-sectional area between the out-of-range location and the adjacent location based on the cavity information.

[0133] The flow cross-sectional area refers to the cross-sectional area between the cavity area corresponding to the location exceeding the standard and the adjacent location. The cross-sectional shape and size are extracted from the 3D drawings of the mold design, imported into CAD software to calculate the cross-sectional area, and obtained by the staff in advance by measuring and integrating it into the cavity information and entering it into the system.

[0134] Step 631: When an adjacent position is only adjacent to one position exceeding the limit, determine the adjacent lower limit based on the glue injection position.

[0135] An adjacent position is only adjacent to one of the exceeding positions. This means that among the adjacent positions of the exceeding position, the adjacent position is only adjacent to the exceeding position. For example, the first gate, the second gate, the third gate and the fourth gate are adjacent in sequence. Among them, the second gate and the fourth gate are both exceeding positions. Then the first gate is only adjacent to the second gate.

[0136] The adjacent lower limit refers to the minimum number of other injection points adjacent to the injection point. In this embodiment, since multiple injection points are arranged sequentially, the adjacent lower limit is 1.

[0137] Step 632: If the adjacent quantity is consistent with the adjacent lower limit, sum the glue flow rate of the adjacent position with the excess value to obtain the corrected glue flow rate.

[0138] If the number of adjacent positions is the same as the lower limit of adjacent positions, it means that there is only one adjacent position for the position that exceeds the standard. This indicates that the position that exceeds the standard is at the beginning or end of the gate sequence. For example, if the first gate, the second gate, and the third gate are adjacent in sequence, and the first gate is the position that exceeds the standard, then the first gate has only one adjacent position, the second gate. In this case, the amount of glue that needs to be added from the adjacent position for the position that exceeds the standard comes from this adjacent position. After calculating the quotient of the exceeding value and the glue injection time, the result is summed with the glue injection flow rate corresponding to the adjacent position to obtain the corrected glue injection flow rate.

[0139] Step 6330: If the adjacent quantity is inconsistent with the adjacent lower limit, calculate the distribution ratio by combining the glue inlet flow rate and flow cross-sectional area corresponding to the adjacent position.

[0140] If the number of adjacent gates is inconsistent with the lower limit of adjacent gates, it means that there are multiple adjacent positions of the position that exceeds the limit. This indicates that the position that exceeds the limit is located in the middle of the gates in sequence. For example, if the first gate, the second gate, and the third gate are adjacent in sequence, and the second gate is the position that exceeds the limit, then the second gate has two adjacent positions, namely the first gate and the third gate. In this case, the amount of glue that needs to be added to the position that exceeds the limit comes from these two adjacent positions.

[0141] The allocation ratio refers to the proportion of the excess value among multiple adjacent positions. The allocation ratio is positively correlated with the flow cross-sectional area. In this embodiment, multiple gates are arranged sequentially, and there are only two adjacent positions. The formula for calculating the corresponding allocation ratio is: P1=S1÷(S1+S2), where P1 is the allocation ratio of the first adjacent position, S1 is the flow cross-sectional area corresponding to the first adjacent position, and S2 is the flow cross-sectional area corresponding to the second adjacent position.

[0142] Step 6331: Calculate the allocation value based on the allocation ratio and the excess value.

[0143] The allocation value refers to the share of excess value that a single adjacent position needs to bear; it is calculated by multiplying the allocation ratio by the excess value.

[0144] Step 6332: Sum the glue flow rate of adjacent positions with the allocation value to obtain the corrected glue flow rate.

[0145] After calculating the quotient between the allocation value and the injection time, the result is summed with the injection flow rate corresponding to the adjacent position to obtain the corrected injection flow rate. The adjacent positions, allocation values ​​and corrected injection flow rates are in one-to-one correspondence.

[0146] The method for correcting the glue flow rate corresponding to adjacent positions also includes the following steps:

[0147] Step 634: When an adjacent position is adjacent to multiple non-compliant positions, calculate the total amount of non-compliant items based on the glue inlet flow rate and flow rate threshold corresponding to the non-compliant position.

[0148] The adjacent position is adjacent to multiple exceeding positions. This means that among the adjacent positions of the exceeding position, the adjacent position is also adjacent to other exceeding positions. For example, the first gate, the second gate, the third gate and the fourth gate are adjacent in sequence. Among them, the second gate and the fourth gate are both exceeding positions. Then the third gate is adjacent to both the second gate and the fourth gate.

[0149] The total amount exceeding the standard refers to the sum of the excess values ​​of all excess locations adjacent to the same adjacent location; it is obtained by calculating the excess value of each excess location separately and then summing all the excess values.

[0150] Step 635: Determine the corrected flow rate by combining the total excess amount and the glue flow rate at adjacent locations.

[0151] Corrected flow rate refers to the injection speed required at adjacent positions after adjustment based on the total excess amount; it is calculated by dividing the excess amount by the injection time and summing the result with the injection flow rate.

[0152] Step 636: When the corrected flow rate is greater than the flow rate threshold, obtain the pipe information and coil information.

[0153] A corrected flow velocity greater than the flow velocity threshold means that the corrected flow velocity at that adjacent location exceeds its own flow velocity threshold, and the flow velocity cannot be affected simply by changing the temperature.

[0154] Pipeline information refers to the structural and material parameters of the glue inlet pipes corresponding to adjacent positions. The outer diameter and material parameters of the glue inlet pipes are extracted from the 3D drawings of the mold design, and the parameters such as the measured magnetic permeability and target magnetic field strength are pre-integrated into the pipeline information and entered into the system.

[0155] The injection pipe is a pipe in the mold body 1 used to introduce molten plastic into the molding cavity 11, and its inner side is the injection channel 12.

[0156] Coil information refers to the hardware configuration parameters of the coil in the electromagnetic pulse module. The staff collects and measures parameters such as the diameter and density of the coil in advance, and collects the initial three-dimensional coordinates of the coil's initial parking position through a laser positioning sensor. The parameters are then integrated into the coil information and entered into the system.

[0157] The electromagnetic pulse module is a device that is pre-set near the mold body 1 and is used to apply electromagnetic force to the glue injection channel. Its movement is controlled by a robotic arm.

[0158] The coil of the electromagnetic pulse module is sleeved on the outside of the glue inlet pipe. When a pulse current is passed through the coil, an alternating magnetic field is generated. The magnetic field acts on the ferromagnetic glue inlet pipe, causing the inner wall of the pipe to vibrate at a high frequency. The vibration breaks the adhesion boundary layer formed by the melt during the flow of the melt on the inner wall of the pipe, reducing the adhesion and shear friction between the melt molecules and the inner wall of the pipe, thereby reducing the flow resistance of the melt and achieving the effect of increasing the flow rate. Moreover, the higher the vibration frequency and the more stable the amplitude, the more significant the effect of increasing the flow rate.

[0159] Step 637: Calculate the excess velocity difference based on the corrected flow velocity and the flow velocity threshold.

[0160] The excess velocity difference refers to the difference between the corrected flow velocity and the velocity threshold at adjacent locations; it is obtained by calculating the difference between the corrected flow velocity and the velocity threshold.

[0161] Step 638: Combine the glue inlet position, the speed difference exceeding the standard, the pipeline information and the coil information to determine the pulse command and execute it synchronously when the execution unit 21 is running, and use the flow rate threshold as the glue inlet flow rate of the adjacent position.

[0162] Pulse commands refer to a set of commands that control the movement and positioning of the electromagnetic coil and output specific frequency and current pulses; the specific determination method will be explained in detail in subsequent steps and will not be repeated here.

[0163] The method for determining pulse commands includes the following steps:

[0164] Step 6380: Obtain the outer diameter and material of the pipe from the pipe information, and obtain the initial position, inner diameter and density of the coil from the coil information.

[0165] The outer diameter of the pipe refers to the external diameter of the glue inlet pipe; it is obtained by measuring the outer diameter of the pipe at multiple points with a micrometer and taking the average value. This information is obtained in advance by the staff, integrated into the pipe information, and entered into the system.

[0166] Pipe material refers to the material type of the glue inlet pipe; check the material certificate of the glue inlet pipe to confirm the material type, and have the staff obtain and integrate the pipe information into the system in advance.

[0167] The initial position refers to the three-dimensional coordinates of the electromagnetic coil when it is not in operation. The initial position of the coil is collected by a laser positioning sensor and is obtained in advance by the staff, integrated into the coil information and entered into the system.

[0168] The inner diameter of the coil refers to the internal diameter of the electromagnetic coil. The inner diameter of the coil is measured by calipers and is obtained in advance by the staff and integrated into the coil information and entered into the system.

[0169] Coil density refers to the number of turns per unit length of electromagnetic coil; it is calculated by measuring the total number of turns and the total length of the coil and then quotienting them. This information is obtained in advance by the staff, integrated into the coil information, and entered into the system.

[0170] Step 6381: Determine the pulse spacing by combining the outer diameter of the pipe and the inner diameter of the coil.

[0171] The pulse spacing refers to the radial distance between the inner wall of the electromagnetic coil and the outer wall of the glue inlet pipe, which affects the effect of the magnetic field. It is calculated by combining the outer diameter of the pipe and the inner diameter of the coil using the following formula: Pulse spacing = (inner diameter of coil - outer diameter of pipe) ÷ 2.

[0172] Step 6382: Determine the correction factor based on the pipe material and pulse interval.

[0173] The correction factor is a coefficient value used to compensate for the influence of pipe material and pulse spacing on magnetic field strength. By establishing a correlation table through trial calibration, different combinations of pipe materials and pulse spacing are selected to test the magnetic field strength attenuation rate, and the correction factor corresponding to the attenuation rate is set. When in use, the corresponding correction factor can be directly retrieved according to the pipe material and pulse spacing.

[0174] Step 6383: Determine the base frequency and base current based on the speed difference exceeding the standard.

[0175] The fundamental frequency refers to the electromagnetic pulse frequency initially set based on the speed difference exceeding the standard, and it is the basic parameter of magnetic field alternation. The corresponding fundamental frequency is found by looking up the frequency correspondence table based on the speed difference exceeding the standard. The frequency correspondence table is a data table that records different speed differences exceeding the standard and their corresponding fundamental frequencies. It is obtained by technicians through preliminary experiments and will not be elaborated on here.

[0176] The base current refers to the electromagnetic coil input current initially set based on the speed difference exceeding the standard, and it is the basic parameter of the magnetic field strength. The corresponding base current is found by looking up the current correspondence table based on the speed difference exceeding the standard. The current correspondence table is a data table that records different speed differences exceeding the standard and their corresponding base currents. It is obtained by technicians through pre-testing and will not be elaborated on here.

[0177] Step 6384: Calculate the target frequency and target current by combining the fundamental frequency, fundamental current and correction factor.

[0178] The target frequency refers to the final electromagnetic pulse frequency after compensation by the correction factor; it is obtained by multiplying the fundamental frequency and the correction factor.

[0179] The target current refers to the final electromagnetic coil input current after compensation by the correction factor; it is obtained by multiplying the base current and the correction factor.

[0180] Step 6385: Determine the movement path using the target current, coil density, initial position, and glue injection position.

[0181] The movement path refers to the trajectory of the electromagnetic coil from its initial position to the target position outside the glue inlet pipe, which includes two stages: positioning and setting. The specific determination method will be explained in detail in subsequent steps and will not be repeated here.

[0182] Step 6386: Integrate the movement path, target frequency, and target current to determine the pulse command.

[0183] The complete execution steps are determined based on the movement path, target frequency, and target current. The electromagnetic coil is moved and placed outside the glue inlet pipe based on the movement path, and the operation of the electromagnetic coil is controlled by combining the target frequency and target current.

[0184] Methods for determining the movement path:

[0185] Step 6390: Determine the alignment path based on the initial position and the glue injection position.

[0186] The alignment path refers to the motion trajectory of the electromagnetic coil from its initial position to the outside of the glue inlet pipe, achieving coaxial positioning with the pipe. Based on the three-dimensional coordinates of the initial position and the glue inlet position, the horizontal offset in the X and Y axes and the height difference in the Z axis are calculated. The system generates a motion trajectory along the offset and height difference, which is the alignment path.

[0187] Step 6391: Determine the number of coil turns based on pipeline information, target current, and pulse spacing.

[0188] The number of coil turns refers to the number of electromagnetic coil turns required to generate the target magnetic field strength; the specific method for determining this will be explained in detail in subsequent steps and will not be repeated here.

[0189] The method for determining the number of coil turns includes the following steps:

[0190] Step 63910: Obtain the permeability and target magnetic field strength from the pipeline information.

[0191] Magnetic permeability refers to the ability of a pipe material to conduct a magnetic field. It is divided into absolute magnetic permeability and relative magnetic permeability. This solution uses relative magnetic permeability. It is obtained through actual measurement with a magnetic permeability tester and is obtained in advance by staff, integrated into the pipe information and entered into the system.

[0192] The target magnetic field strength refers to the minimum magnetic field strength required to drive the glue inlet pipe to generate micro-amplitude vibrations of 5 to 15 micrometers. Through trial molding calibration, different magnetic field strengths are set to test the vibration amplitude of the pipe, and the magnetic field strength value in the vibration amplitude range of 5 to 15 micrometers is determined. The staff obtains and integrates the pipe information in advance and enters it into the system.

[0193] The range of 5 to 15 micrometers is derived from the principles of melt drag reduction, pipe material characteristics, part forming quality, and experiments. If the vibration amplitude is less than 5 micrometers, the vibration energy cannot break the adhesion between melt molecules and the inner wall of the pipe. If the vibration amplitude is greater than 15 micrometers, excessive vibration will cause pipe resonance and disrupt the laminar flow state of the melt.

[0194] Step 63911: Determine the magnetic field attenuation coefficient based on the pulse spacing and permeability.

[0195] The magnetic field attenuation coefficient is a coefficient used to compensate for the loss of magnetic field strength caused by the pulse spacing. The larger the pulse spacing and the lower the permeability, the smaller the attenuation coefficient. The corresponding magnetic field attenuation coefficient can be found in the attenuation correspondence table according to the pulse spacing and permeability. The current correspondence table is a data table that records different pulse spacings and permeabilities and their corresponding magnetic field attenuation coefficients. It is obtained by technicians through prior experiments and will not be elaborated here.

[0196] Step 63912: Determine the total magnetic field requirement by combining the magnetic field attenuation coefficient, the target magnetic field strength, and the pulse spacing.

[0197] The total magnetic field requirement refers to the total magnetic field parameters required to offset magnetic field attenuation and achieve the target magnetic field strength; it is calculated by multiplying the magnetic field attenuation coefficient, the target magnetic field strength, and the pulse spacing.

[0198] Step 63913: Calculate the efficiency factor based on the permeability and target current.

[0199] The efficiency factor refers to the combined efficiency of the current in the electromagnetic coil and the material of the pipe in generating the magnetic field; it is obtained by multiplying the permeability and the target current.

[0200] Step 63914: Determine the number of coil turns based on the total magnetic field demand and efficiency factor.

[0201] The number of coil turns is determined by quotienting the total magnetic field requirement with the efficiency factor.

[0202] Step 6392: Determine the insertion length by combining the number of coil turns and the coil density.

[0203] Insertion length refers to the final axial length of the electromagnetic coil sleeved to the outside of the glue inlet pipe; the insertion length is determined by quotienting the number of coil turns and the coil density.

[0204] Step 6393: Determine the move path based on the alignment path and insertion length.

[0205] Based on the radial compensation of the alignment path, a linear motion trajectory with horizontal and vertical linkage is generated. Taking the coil position after radial alignment as the insertion starting point, a linear insertion trajectory with a length equal to the insertion length is generated along the axial extension direction of the glue inlet pipe. The motion path is then integrated.

[0206] The method for correcting the glue flow rate based on adjacency relationships also includes the following steps:

[0207] Step 64: If there are adjacent positions that exceed the standard, define the larger exceeding value among the adjacent exceeding positions as the downward adjustment value.

[0208] The adjacency relationship is that there are at least two adjacent positions between the positions that exceed the standard. By comparing the positions that exceed the standard with the adjacency list, it is determined that there are any two adjacent positions that exceed the standard.

[0209] The reduction value refers to the core quantitative parameter used to reduce the glue flow rate at adjacent out-of-limit locations; the out-of-limit values ​​at all adjacent out-of-limit locations are counted, and the out-of-limit value with the largest value is selected as the reduction value.

[0210] Step 65: Obtain the number of consecutive adjacent positions that exceed the limit.

[0211] The consecutive number refers to the total number of consecutive connected nodes formed by adjacent out-of-specification locations. For example, if the first gate, the second gate, and the third gate are all adjacent to each other and are all out-of-specification locations, then the consecutive number is 3.

[0212] Step 66: Adjust the coefficient based on continuous quantity matching.

[0213] The reduction factor refers to the flow rate reduction ratio coefficient that matches the continuous quantity. The corresponding reduction factor is retrieved from the reduction correspondence table based on the continuous quantity. The reduction correspondence table is a data table that records different continuous quantities and their corresponding reduction factors. It is obtained by technicians through prior testing and will not be elaborated here.

[0214] Step 67: Adjust the glue flow rate by combining the adjustment value and adjustment coefficient.

[0215] The corrected injection flow rate is obtained by subtracting the product of the reduction value and the reduction coefficient from the injection flow rate corresponding to each injection position.

[0216] Step 68: Adjust the injection time based on the corrected injection flow rate, product information, and injection quantity.

[0217] Combining the formula for calculating the injection flow rate determined in step 3, the corrected injection flow rate is substituted into the formula to calculate the corrected injection time.

[0218] Step 7: Combine the modified glue feed rate and glue feed duration to control the execution unit 21 to run.

[0219] The execution unit 21 is controlled to operate according to the glue injection position and its corrected glue injection flow rate and injection time; the execution unit 21 is a device that controls the melt flow rate by heating, and matches the corresponding heating parameters based on the glue injection flow rate and operates.

[0220] 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 method for controlling the hot runner injection of a chair armrest side panel injection mold, characterized in that, include: Step 1: In response to the mold closing completion signal, collect product information, cavity information, and injection position; Step 2: Determine the flow rate threshold, injection time, and injection component corresponding to the injection position based on the cavity information; Step 3: Determine the glue flow rate based on product information, glue quantity, and glue dispensing time; Step 4: Define the injection position corresponding to the injection rate that is greater than the flow rate threshold as the out-of-range position, and define the injection position adjacent to the out-of-range position as the adjacent position; Step 5: Obtain the adjacency relationships of the locations exceeding the standard; Step 6: Adjust the glue flow rate based on the adjacency relationship; Step 60: Calculate the excess value based on the glue inlet flow rate and flow rate threshold corresponding to the excess location; Step 61: If there are no adjacent positions between the positions that exceed the standard, use the flow rate threshold as the glue injection flow rate for the position that exceeds the standard; Step 62: Obtain the number of adjacent positions at the out-of-limit locations; Step 63: Adjust the glue flow rate corresponding to the adjacent positions based on the adjacent quantities and the excess value; Step 64: If there are adjacent positions that exceed the standard, define the larger exceeding value among the adjacent exceeding positions as the downward adjustment value; Step 65: Obtain the number of consecutive adjacent positions that exceed the limit; Step 66: Adjust the coefficient based on continuous quantity matching; Step 67: Adjust the glue injection rate by combining the adjustment value and adjustment coefficient; Step 68: Adjust the injection time based on the corrected injection flow rate, product information, and injection quantity; Step 7: Combine the modified glue flow rate and glue feeding time to control the execution unit (21) to run.

2. The method for controlling the hot runner injection of a chair armrest side panel injection mold according to claim 1, characterized in that, Methods for correcting the glue flow rate at adjacent positions include: Step 630: Obtain the flow cross-sectional area between the out-of-range location and the adjacent location based on the cavity information; Step 631: When an adjacent position is only adjacent to one position exceeding the limit, determine the adjacent lower limit based on the glue injection position; Step 632: If the adjacent quantity is consistent with the adjacent lower limit, sum the glue injection rate of the adjacent position with the excess value to obtain the corrected glue injection rate; Step 6330: If the adjacent quantity is inconsistent with the adjacent lower limit, calculate the allocation ratio by combining the glue inlet flow rate and flow cross-sectional area corresponding to the adjacent position; Step 6331: Calculate the allocation value based on the allocation ratio and the excess value; Step 6332: Sum the glue flow rate of adjacent positions with the allocation value to obtain the corrected glue flow rate.

3. The method for controlling the hot runner injection of a chair armrest side panel injection mold according to claim 2, characterized in that, Methods for correcting the glue flow rate at adjacent positions also include: Step 634: When an adjacent position is adjacent to multiple non-compliant positions, calculate the total amount of non-compliant items based on the glue injection flow rate and flow rate threshold corresponding to the non-compliant position; Step 635: Determine the corrected flow rate by combining the total excess amount and the glue flow rate at adjacent locations; Step 636: When the corrected flow rate is greater than the flow rate threshold, obtain pipe information and coil information; Step 637: Calculate the excess velocity difference based on the corrected flow velocity and the flow velocity threshold; Step 638: Combine the glue inlet position, the speed difference of exceeding the standard, the pipeline information and the coil information to determine the pulse command and execute it synchronously when the execution unit (21) is running, and use the flow rate threshold as the glue inlet flow rate of the adjacent position.

4. The method for controlling the hot runner injection of a chair armrest side panel injection mold according to claim 3, characterized in that, Methods for determining pulse commands include: Step 6380: Obtain the outer diameter and material of the pipe from the pipe information, and obtain the initial position, inner diameter and density of the coil from the coil information; Step 6381: Determine the pulse interval by combining the outer diameter of the pipe and the inner diameter of the coil; Step 6382: Determine the correction factor based on the pipe material and pulse interval; Step 6383: Determine the fundamental frequency and fundamental current based on the speed difference exceeding the standard; Step 6384: Calculate the target frequency and target current by combining the base frequency, base current, and correction factor; Step 6385: Determine the movement path based on the target current, coil density, initial position, and glue injection position; Step 6386: Integrate the movement path, target frequency, and target current to determine the pulse command.

5. The method for controlling the hot runner injection of a chair armrest side panel injection mold according to claim 4, characterized in that, Methods for determining the movement path: Step 6390: Determine the alignment path based on the initial position and the glue injection position; Step 6391: Determine the number of coil turns based on pipeline information, target current, and pulse spacing; Step 6392: Determine the insertion length by combining the number of coil turns and the coil density; Step 6393: Determine the move path based on the alignment path and insertion length.

6. The method for controlling the hot runner injection of a chair armrest side panel injection mold according to claim 5, characterized in that, Methods for determining the number of coil turns include: Step 63910: Obtain the permeability and target magnetic field strength from the pipeline information; Step 63911: Determine the magnetic field attenuation coefficient based on the pulse spacing and permeability; Step 63912: Determine the total magnetic field requirement by combining the magnetic field attenuation coefficient, the target magnetic field strength, and the pulse spacing; Step 63913: Calculate the efficiency factor based on the permeability and target current; Step 63914: Determine the number of coil turns based on the total magnetic field demand and efficiency factor.

7. A chair armrest side panel injection mold, controlled by a hot runner injection control method for a chair armrest side panel injection mold as described in any one of claims 1 to 6, comprising a mold body (1) having a molding cavity (11) and multiple injection channels (12), characterized in that, It also includes a flow rate control structure (2) for controlling the flow rate of molten plastic entering the molding cavity (11) through the glue inlet channel (12); One end of the glue inlet channel (12) is connected to the molding cavity (11), and the other end of the glue inlet channel (12) is connected to the external material supply equipment; The flow rate control structure (2) includes an execution unit (21) for regulating the flow rate of molten plastic in different glue inlet channels (12) and a control unit (22) for controlling the execution unit (21). The execution unit (21) is installed at the entrance of the glue inlet channel (12), and the control unit (22) is electrically connected to the execution unit (21).

8. The injection mold for a chair armrest side panel according to claim 7, characterized in that, The molding cavity (11) is also provided with a first core (13) that is slidably connected to the mold body (1), and the mold body (1) is also provided with a core-pulling structure (3) for driving the first core (13) to move. The core-pulling structure (3) includes a first sliding frame (31) mounted on the mold body (1), a first slider (32) that is limited and slidably mounted on the first sliding frame (31), and a first push-pull unit (33) that is fixedly mounted on the first slider (32). The output end of the first push-pull unit (33) is fixedly connected to the mold body (1). The driving direction of the first push-pull unit (33), the extension direction of the first core (13), and the sliding direction of the first core (13) are all the same.

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