Mold adjusting method of three-plate type injection molding machine for measuring mold thickness based on mold closing motor

Abstract

The invention relates to the technical field of injection molding machine control, in particular to a mold adjusting method of a three-plate injection molding machine for measuring mold thickness based on a mold closing motor, and the method comprises the following steps: S1, installing an elbow structure between an upper mold and a lower mold; s2, determining a preset mold clamping force; s3, after a mold adjusting function is started, a mold reserved space is opened; s4, the adjusting mold moves forwards by a small distance; s5, low-speed high-pressure mold closing is conducted twice; s6, judging whether the bent elbow is straightened or not, and checking whether the position of the template is in a preset interval or not when the bent elbow is not straightened; s7, recording the corresponding template position and the motor torque during two times of mold closing, and calculating the corresponding mold locking force; s8, the elastic coefficient of the mold is calculated; S9, the mold adjusting distance is calculated; and S10, the mold adjusting effect is detected, and if the bent elbow is not straightened, fine adjustment is carried out, and retreating by one tooth pitch is carried out for re-detection. According to the invention, the actual elastic coefficient of the mold is calculated through the mold clamping force and template position data recorded by two times of mold closing, and the mold adjusting position is adjusted based on the coefficient, so that the mold clamping force after mold adjusting is closer to a set value.

Description

Technical Field

[0001] This invention relates to the field of injection molding machine control technology, and in particular to a mold adjustment method for a three-platen injection molding machine based on measuring mold thickness using a mold clamping motor. Background Technology

[0002] Currently, in the mold adjustment of three-platen injection molding machines, the mold is measured by the mold adjustment motor. There are generally two specific methods.

[0003] The first method calculates the compensation distance for mold adjustment based on the set clamping force. The mold is first opened to this distance, and the entire mold closing unit is driven forward by the mold adjustment motor to squeeze the mold. When the force provided by the mold adjustment motor cannot drive the mold closing unit, the current position is considered to be the actual thickness of the mold.

[0004] The second method involves first closing the mold completely, then using a mold adjustment motor to drive the entire mold closing unit forward to press the mold. When the force provided by the mold adjustment motor is insufficient to drive the mold closing unit, the mold is then opened. The mold adjustment motor then calculates the compensation distance based on the set clamping force, and the distance the mold adjustment motor moves forward is taken as the actual thickness of the mold.

[0005] Traditional mold adjustment methods, when dealing with spring molds, require fully compressing the spring into the mold to achieve the correct mold thickness. This necessitates that the force of the adjustment motor exceed the required compression force of the spring, necessitating the use of a high-torque motor. However, such motors are typically bulky and expensive. Considering both cost and machine size, choosing such a large motor is impractical. Therefore, in such cases, the only solution is to manually adjust the mold thickness.

[0006] Furthermore, this mold adjustment method lacks the measurement of the mold's elastic modulus. Different molds often have different clamping forces under the same compression deformation distance. Currently, the clamping force is calculated directly using the formula ΔL=F*(L / (A*E)), where ΔL is the length change of the object after being subjected to force; F is the force on the object; A is the area of ​​the object subjected to force; L is the original length of the object; and E is the elastic modulus, which is related to the material.

[0007] However, a mold is like a spring. Different mold sizes and materials will affect its elasticity coefficient. Therefore, when traditional mold adjustment methods calculate the compensation distance of mold adjustment by clamping force, a fixed elasticity coefficient clamping force is used for calculation. Such calculation values ​​cannot be correctly matched to different molds, which will lead to inconsistencies between the clamping force and the set value.

[0008] Furthermore, in traditional mold adjustment methods, the adjustment motor needs to press against the mold to lock it in place. If the motor speed is high, it may stall at the moment of contact, resulting in a large current that can easily trigger an overcurrent alarm and interrupt the mold adjustment process. Therefore, the adjustment motor cannot be used at high speed for this step, leading to slow mold adjustment speed and long adjustment time.

[0009] Therefore, we propose a mold adjustment method for a three-platen injection molding machine based on mold thickness measurement using a mold clamping motor to solve the above problems. Summary of the Invention

[0010] This invention addresses the shortcomings of traditional mold adjustment methods in the prior art, which use a fixed elastic coefficient for calculating the clamping force when calculating the compensation distance. Such calculations cannot accurately match different molds, leading to inconsistencies between the clamping force and the set value. This invention provides a mold adjustment method for a three-platen injection molding machine based on measuring the mold thickness using a clamping motor.

[0011] This invention is achieved through the following technical solution:

[0012] A mold adjustment method for a three-platen injection molding machine based on mold thickness measurement using a mold clamping motor includes the following steps:

[0013] S1. Install a toggle structure between the injection molding machine support plate and the moving platen;

[0014] S2. Determine the preset clamping force required for the current mold;

[0015] S3. After starting the mold adjustment function, first open the reserved space of the mold to avoid the motor from stalling due to the mold obstruction during mold adjustment;

[0016] S4. Move the mold adjustment mechanism forward a short distance to eliminate the backlash of the gears in front of the mold adjustment mechanism, reduce the mold adjustment error, and at the same time reduce the torque of the mold closing motor to avoid the mold adjustment motor from stalling and causing an overcurrent alarm.

[0017] S5. Perform two low-speed, high-pressure mold closing operations using 100% of the mold closing motor torque and 75% of the mold closing motor torque.

[0018] S6. Determine whether the elbow is straight by the encoder value. If it is not straight, check whether the template position is within the preset range.

[0019] S7. Record the corresponding mold plate position and motor torque during the two mold closing operations, and calculate the corresponding clamping force.

[0020] S8. Calculate the mold elastic coefficient based on the two clamping force and mold plate position data:

[0021] S9. Calculate the mold adjustment distance based on the elastic coefficient and determine the target position for mold adjustment;

[0022] S10. After adjusting the mold to the target position, test the mold adjustment effect by high pressure mold closing. If the elbow is not straightened, make a slight adjustment and back one tooth pitch and retest until the mold adjustment is successful.

[0023] In a preferred embodiment of the present invention, the toggle structure includes a mold closing motor, a mold adjusting screw, a mold adjusting crosshead, and a toggle. One end of the mold adjusting screw is fixed to the output end of the mold closing motor, and the other end of the mold adjusting screw is threadedly connected to the mold adjusting crosshead. The two ends of the mold adjusting crosshead are respectively rotatably connected to the two sides of the toggle. The position of the mold adjusting crosshead is controlled by the rotation of the mold adjusting screw driven by the operation of the mold closing motor. By combining the characteristics of the mold closing motor and the three-plate toggle structure, the force of the mold closing motor is amplified by the toggle structure, so that all molds can be adjusted in the same way, simplifying the use of the mold adjustment function.

[0024] In a preferred embodiment of the present invention, during the first low-speed, high-pressure mold closing process, the minimum position of the mold plate with a torque of less than 10% is recorded to confirm the mold contact state for the first time. When the mold plate position does not fall into the preset range, the mold is opened to the minimum position of the mold plate with a torque of less than 10% of the closing motor position, the mold is adjusted forward, and the torque of the closing motor is reduced to avoid stalling. The change in the position of the mold plate is monitored to confirm whether the moving mold plate is in contact with the mold. This prevents the closing motor from being instantly popped off by the spring on the mold due to the reduction in the closing torque during subsequent mold adjustment, ensuring machine safety and reducing the impact of abnormal mold plate position on subsequent judgment logic.

[0025] In a preferred embodiment of the present invention, the preset value range of the template position is 3.0mm-4.5mm. Within this range, the toggle mechanism can better amplify the force of the mold closing motor, and the amplification coefficient of the toggle structure does not change much within this range, thus reducing the error in subsequent calculations.

[0026] In a preferred embodiment of the present invention, encoders are installed on both the mold closing motor and the elbow structure. The elbow is straightened by comparing the encoder value of the mold closing motor with the encoder value when the elbow is straightened.

[0027] In a preferred embodiment of the present invention, the formula for calculating the clamping force in step S7 is as follows:

[0028]

[0029] Where K is the proportionality coefficient and a is the exponent.

[0030] In a preferred embodiment of the present invention, the proportional coefficient K and the exponent a are obtained by linear regression of the data obtained through elbow model simulation.

[0031] In a preferred embodiment of the present invention, the formula for calculating the mold elastic coefficient is: elastic coefficient = (clamping force 1 - clamping force 2) / (template position 2 - template position 1). This introduces the concept of coarse measurement of the mold elastic coefficient. The mold elastic coefficient is calculated by using the actual torque of the motor and the force amplification factor of the elbow 4. The calculation result is then applied to the calculation of the mold adjustment target position. Based on this coefficient, the mold adjustment position is adjusted so that the clamping force after mold adjustment is closer to the set value.

[0032] In a preferred embodiment of the present invention, the formula for calculating the target position of the mold adjustment is: final target position of mold adjustment = current mold adjustment position + template position - adjustment distance.

[0033] In a preferred embodiment of the present invention, the formula for calculating the adjustment distance is: adjustment distance = (set clamping force - clamping force) / elastic coefficient.

[0034] The beneficial effects of this invention are:

[0035] 1. This invention utilizes the force amplification characteristics of the mold clamping motor and the toggle structure, and leverages the amplification effect of the toggle mechanism on the torque of the mold clamping motor. In particular, the amplification coefficient is stable in the range of 3.0mm-4.5mm. The spring mold can be adjusted without increasing the power of the mold adjustment motor, thus avoiding the problems of increased equipment size and cost caused by using a high-torque motor.

[0036] 2. This invention calculates the actual elastic coefficient of the mold (elastic coefficient = (clamping force 1 - clamping force 2) / (template position 2 - template position 1)) by recording the clamping force and template position data of two mold closing operations (100% torque and 75% torque), and adjusts the mold adjustment position based on this coefficient so that the clamping force after mold adjustment is closer to the set value;

[0037] 3. This invention achieves automatic identification and adjustment of spring molds through an automated process, eliminating the need for manual judgment of mold type or setting parameters such as spring stroke, thus completely solving the error caused by manual operation and reducing the dependence on the skill level of operators.

[0038] 4. This invention completely eliminates the risk of stalling by designing "pre-reserved space for mold opening + reduced mold closing torque", which allows for higher motor speeds and significantly shortens the mold adjustment cycle. Attached Figure Description

[0039] Figure 1 This is a schematic diagram illustrating the operation steps of a mold adjustment method for a three-platen injection molding machine based on a mold clamping motor for measuring mold thickness, according to the present invention.

[0040] Figure 2 This is a schematic diagram of the toggle structure in a mold adjustment method for a three-platen injection molding machine based on a mold clamping motor for measuring mold thickness, according to the present invention.

[0041] Figure 3 This is a comparison diagram of the clamping force of mold No. 1 in a mold adjustment method for a three-platen injection molding machine based on a clamping motor for measuring mold thickness, according to the present invention.

[0042] Figure 4 This is a comparison diagram of the clamping force of mold No. 2 in a mold adjustment method for a three-platen injection molding machine based on a mold clamping motor for measuring mold thickness, according to the present invention.

[0043] Figure 5 This is a comparison chart of the mold adjustment time for new and old molds in a mold adjustment method for a three-platen injection molding machine based on a mold clamping motor for measuring mold thickness, according to the present invention.

[0044] In the diagram: 1. Mold closing motor; 2. Mold adjusting screw; 3. Mold adjusting crosshead; 4. Torque. Detailed Implementation

[0045] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of the present invention. The directional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "top," and "bottom," are merely for reference to the accompanying drawings. Therefore, the directional terms used are for illustrating and understanding the present invention, and not for limiting the present invention.

[0046] like Figure 1-5 The method for adjusting the mold of a three-platen injection molding machine based on measuring mold thickness using a mold clamping motor, as shown, includes the following steps:

[0047] S1. An elbow structure is installed between the injection molding machine support plate and the moving platen. The elbow structure includes a mold clamping motor, a mold adjusting screw, a mold adjusting crosshead, and an elbow. One end of the mold adjusting screw is fixed to the output end of the mold clamping motor, and the other end of the mold adjusting screw is threaded to the mold adjusting crosshead. The two ends of the mold adjusting crosshead are rotatably connected to the elbows on both sides. The position of the mold adjusting crosshead is controlled by the rotation of the mold adjusting screw driven by the operation of the mold clamping motor. By combining the characteristics of the mold clamping motor and the three-plate elbow structure, the force of the mold clamping motor is amplified by the elbow structure, so that all molds can be adjusted in the same way, simplifying the use of the mold adjustment function.

[0048] S2. Determine the preset clamping force required for the current mold;

[0049] S3. After starting the mold adjustment function, first open the reserved space of the mold to avoid the motor from stalling due to the mold obstruction during mold adjustment;

[0050] S4. Move the mold adjustment mechanism forward a short distance to eliminate the backlash of the gears in front of the mold adjustment mechanism, reduce the mold adjustment error, and at the same time reduce the torque of the mold closing motor to 2.5% to avoid the mold adjustment motor from stalling and causing an overcurrent alarm.

[0051] S5. Perform two low-speed, high-pressure mold closing operations using 100% and 75% of the mold closing motor torque. During the first low-speed, high-pressure mold closing operation using 100% of the mold closing motor torque, record the minimum position of the template where the torque is less than 10%. Confirm the mold contact status for the first time. If the template position does not fall into the preset range, open the mold to the minimum position of the template where the mold closing motor torque is less than 10%, adjust the mold forward, and reduce the mold closing motor torque to avoid stalling. Monitor the changes in the template position to confirm whether the moving template is in contact with the mold. This prevents the mold closing motor from being instantly ejected by the spring on the mold due to the reduction in the mold closing torque during subsequent mold adjustment, ensuring machine safety and reducing the impact of abnormal template position on subsequent judgment logic.

[0052] S6. Encoders are installed on both the mold closing motor and the toggle structure. The toggle is straightened by comparing the encoder value of the mold closing motor with the encoder value when the toggle is straightened. If it is not straightened, check whether the template position is within the preset range of 3.0mm-4.5mm. Within this range, the toggle mechanism can amplify the force of the mold closing motor well, and the amplification coefficient of the toggle structure does not change much within this range, reducing the error of subsequent calculations.

[0053] S7. Record the corresponding mold plate position and motor torque during the two mold closing operations, and calculate the corresponding clamping force 1 and clamping force 2. The calculation formula is as follows:

[0054]

[0055] Where K is the proportionality coefficient and a is the exponent. The proportionality coefficient K and the exponent a are obtained by linear regression after the data are obtained through the elbow model simulation.

[0056] S8. Based on the two clamping force and template position data, calculate the mold elastic coefficient. The calculation formula is: elastic coefficient = (clamping force 1 - clamping force 2) / (template position 2 - template position 1). The concept of coarse measurement of mold elastic coefficient is introduced. The mold elastic coefficient is calculated by the actual torque of the motor and the force amplification factor of the elbow 4. The calculation result is applied to the calculation of the mold adjustment target position. Based on the coefficient, the mold adjustment position is adjusted so that the clamping force after mold adjustment is closer to the set value.

[0057] S9. Calculate the mold adjustment distance based on the elastic coefficient to determine the mold adjustment target position. The formula for calculating the mold adjustment target position is: Final mold adjustment target position = Current mold adjustment position + Template position - Adjustment distance; The formula for calculating the adjustment distance is: Adjustment distance = (Set clamping force - Clamping force) / Elastic coefficient.

[0058] S10. After adjusting the mold to the target position, test the mold adjustment effect by high pressure mold closing. If the elbow is not straightened, make a slight adjustment and back one tooth pitch and retest until the mold adjustment is successful.

[0059] The new mold adjustment method no longer distinguishes between mold types. Automatic mold adjustment can be started with a single click, and the system will automatically complete all processes without relying on manual input of relevant parameters. This avoids human error that could cause abnormal mold adjustment results, improves the stability of mold adjustment, and simplifies the operation of the mold adjustment function.

[0060] In this embodiment, the specific steps for mold adjustment are as follows:

[0061] Step 1: Start the mold adjustment function;

[0062] Step 2: Input the clamping force required for the current mold;

[0063] Step 3: Open the mold to allow space for mold adjustment movement and prevent the mold adjustment motor from stalling and causing an overcurrent alarm;

[0064] Step 4: Move the mold forward a short distance to eliminate the backlash of the gears in front of the mold adjustment structure, reduce the mold adjustment error, and at the same time reduce the torque of the mold closing motor to avoid the mold adjustment motor stalling and causing an overcurrent alarm;

[0065] Step 5: Low-speed, high-pressure mold closing (using 100% of the mold closing motor torque), confirm the mold thickness for the first time, and record the minimum position of the mold plate when the mold closing motor torque is less than 10%;

[0066] Step 6: Compare the encoder value of the mold closing motor with the encoder value when the elbow is straightened to determine whether the elbow is straightened. If it is straightened, it means that the mold closing motor is not in contact with the mold and the mold needs to be adjusted to move forward. Proceed to Step 8. If it is not straightened, proceed to Step 7.

[0067] Step 7: Determine whether the mold plate position falls within the 3.0mm-4.5mm range when the mold closing motor stalls (within this range, the toggle mechanism can effectively amplify the force of the mold closing motor, and the amplification coefficient of the toggle structure does not change significantly within this range, reducing the error in subsequent calculations). If yes, proceed to step 10; otherwise, proceed to step 8.

[0068] Proceed to step 8: Open the mold to the minimum position of the mold closing motor torque of less than 10% to avoid the mold closing motor being instantly popped open by the spring on the mold due to the reduction of the mold closing torque during subsequent mold adjustment, thus ensuring machine safety and reducing the impact of abnormal mold position on subsequent judgment logic.

[0069] Proceed to step 9: Adjust the mold forward and reduce the torque of the mold closing motor to avoid stalling. Monitor the changes in the position of the template to confirm whether the moving template is in contact with the mold.

[0070] Step 10: Record the template position 1 and the clamping motor torque 1, and calculate the clamping force 1 provided by the clamping motor on the moving template using the template position and toggle parameters and the formula;

[0071] Step 11: Open the mold to prepare for the next mold closing;

[0072] Step 12: Low-speed, high-pressure mold closing (using 75% of the mold closing motor torque);

[0073] Step 13: Record the template position 2 and the clamping motor torque 2, and calculate the clamping force 2 of the clamping motor on the moving template using the template position and elbow parameters and the formula in Step 10.

[0074] Step 14: Open the mold to facilitate the movement of the mold adjustment motor and to prepare for the next mold closing.

[0075] Step 15: Calculate the target position for mold adjustment; obtain the elastic coefficient using the formula = (clamping force 1 - clamping force 2) / (template position 2 - template position 1), and then adjust the distance using the formula = (set clamping force - clamping force 1) / elastic coefficient. Finally, the target position for mold adjustment = the current mold adjustment position + template position 1 - adjustment distance.

[0076] Step 16: Move the mold to the target position;

[0077] Step 17: High-pressure mold closing, check if mold adjustment was successful;

[0078] Step 18: If the elbow straightens, the mold closing is complete, proceed to step 21; if not, it means the mold adjustment position is unreliable.

[0079] Step 19: Open the mold to facilitate the movement of the mold adjustment motor and to prepare for the next mold closing.

[0080] Step 20: Since the current mold adjustment position is unreliable and the accurate mold adjustment position cannot be calculated, make a fine adjustment by moving the mold back one tooth pitch, and proceed to step 18;

[0081] Step 21: Mold adjustment complete, record the correct mold thickness, and end the mold adjustment process.

[0082] Clamping force comparison test:

[0083] like Figure 3 As shown, two different molds were used for mold adjustment. Under two different target clamping forces, the molds were adjusted 10 times consecutively, and the deviation between the actual clamping force and the target clamping force was compared.

[0084] The results of the comparison at 400KN are quite similar, both around 400KN.

[0085] Based on the comparison results at 800KN, the clamping force of the original mold adjustment scheme is around 750KN, while the clamping force of the new mold adjustment scheme is between 750KN and 820KN. The new mold adjustment clamping force is closer to the target value of 800KN, resulting in a better mold adjustment effect.

[0086] like Figure 4 As shown, since the size and thickness of this mold are significantly different from the previous mold, the elastic coefficients of the two molds differ considerably.

[0087] Based on the comparison results of 800KN, the clamping force of the original mold adjustment scheme is around 950KN, while the clamping force of the new mold adjustment scheme is between 850KN and 920KN.

[0088] Based on the comparison results of 1200KN, the clamping force of the original mold adjustment scheme is around 1400KN, while the clamping force of the new mold adjustment scheme is between 1260KN and 1350KN.

[0089] By combining the clamping force results of the two molds, the new clamping mechanism will have better clamping results between different molds.

[0090] Molding time test:

[0091] Using the same machine, the same mold was adjusted at different mold thickness positions to simulate the mold adjustment process after changing molds of different thicknesses. The test results are as follows. Figure 5 As shown;

[0092] By comparing the actual mold adjustment time, when the initial mold thickness is close to the target mold thickness, the mold adjustment time is similar. However, the greater the mold thickness deviation, the shorter the time required for the new mold adjustment method and the more obvious the effect.

[0093] During each critical step of the mold adjustment program, key data is printed in the background execution trajectory file, and this data is stored long-term. If an abnormality occurs during mold adjustment, the execution trajectory file can be extracted for reference, allowing for effective reconstruction of the mold adjustment process and rapid and accurate identification of the cause of the fault.

[0094] It should be noted that, in the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "set up," "equipped with," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0095] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A mold adjustment method for a three-platen injection molding machine based on mold thickness measurement using a mold clamping motor, characterized in that, Includes the following steps: S1. Install a toggle structure between the injection molding machine support plate and the moving platen; S2. Determine the preset clamping force required for the current mold; S3. After starting the mold adjustment function, first open the reserved space of the mold to avoid the motor from stalling due to the mold obstruction during mold adjustment; S4. Move the mold adjustment mechanism forward a short distance to eliminate the backlash of the gears in front of the mold adjustment mechanism, reduce the mold adjustment error, and at the same time reduce the torque of the mold closing motor to avoid the mold adjustment motor from stalling and causing an overcurrent alarm. S5. Perform two low-speed, high-pressure mold closing operations using 100% of the mold closing motor torque and 75% of the mold closing motor torque. S6. Determine whether the elbow is straight by the encoder value. If it is not straight, check whether the template position is within the preset range. S7. Record the corresponding mold plate position and motor torque during the two mold closing operations, and calculate the corresponding clamping force. S8. Calculate the mold elastic coefficient based on the two clamping force and mold plate position data: S9. Calculate the mold adjustment distance based on the elastic coefficient and determine the target position for mold adjustment; S10. After adjusting the mold to the target position, test the mold adjustment effect by high pressure mold closing. If the elbow is not straightened, make a slight adjustment and back one tooth pitch and retest until the mold adjustment is successful.

2. The mold adjustment method for a three-platen injection molding machine based on a mold clamping motor for measuring mold thickness, as described in claim 1, is characterized in that: The elbow structure includes a mold closing motor (1), a mold adjusting screw (2), a mold adjusting crosshead (3), and an elbow (4). One end of the mold adjusting screw (2) is fixed to the output end of the mold closing motor (1), and the other end of the mold adjusting screw (2) is threadedly connected to the mold adjusting crosshead (3). The two ends of the mold adjusting crosshead (3) are rotatably connected to the elbows (4) on both sides.

3. The mold adjustment method for a three-platen injection molding machine based on a mold clamping motor for measuring mold thickness, as described in claim 1, is characterized in that: During the first low-speed, high-pressure mold closing process, record the minimum position of the mold plate when the torque is less than 10%, and confirm the mold contact status for the first time. When the mold plate position does not fall into the preset range, open the mold to the minimum position of the mold plate when the torque of the mold closing motor is less than 10%, adjust the mold forward, and reduce the torque of the mold closing motor to avoid stalling. Monitor the changes in the position of the mold plate to confirm whether the moving mold plate is in contact with the mold.

4. The mold adjustment method for a three-platen injection molding machine based on a mold clamping motor for measuring mold thickness, as described in claim 3, is characterized in that: The preset value range for the template position is 3.0mm-4.5mm.

5. The mold adjustment method for a three-platen injection molding machine based on a mold clamping motor for measuring mold thickness, as described in claim 1, is characterized in that: Both the mold closing motor and the elbow structure are equipped with encoders. The elbow is straightened by comparing the encoder value of the mold closing motor with the encoder value when the elbow was straightened.

6. The mold adjustment method for a three-platen injection molding machine based on a mold clamping motor for measuring mold thickness, as described in claim 1, is characterized in that: The formula for calculating the clamping force in step S7 is: Where K is the proportionality coefficient and a is the exponent.

7. The mold adjustment method for a three-platen injection molding machine based on a mold clamping motor for measuring mold thickness, as described in claim 6, is characterized in that: The proportional coefficient K and the exponent a are obtained by linear regression after the data are obtained through simulation using the elbow model.

8. The mold adjustment method for a three-platen injection molding machine based on a mold clamping motor for measuring mold thickness, as described in claim 1, is characterized in that: The formula for calculating the elastic coefficient of the mold is: Elastic coefficient = (clamping force 1 - clamping force 2) / (template position 2 - template position 1).

9. A mold adjustment method for a three-platen injection molding machine based on a mold clamping motor for measuring mold thickness, as described in claim 8, characterized in that: The formula for calculating the target position of the mold adjustment is: The final target position for mold adjustment = current mold adjustment position + template position - adjustment distance.

10. A mold adjustment method for a three-platen injection molding machine based on a mold clamping motor for measuring mold thickness, as described in claim 9, characterized in that: The formula for calculating the adjustment distance is: Adjustment distance = (set clamping force - clamping force) / elastic coefficient.

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