Method for controlling repeated positioning precision of mold opening end point of injection molding machine

Abstract

The invention discloses an injection molding machine mold opening end point repeated positioning precision control method, which comprises the steps of parameter definition, presetting, data collection and processing in the production process, target position correction and adjustment and the like, and has the advantages that the change of the mold opening end point position of each mold is monitored in the automatic production process of an injection molding machine; the control parameters of mold opening positioning are corrected in real time, the mold opening repeated positioning precision is effectively improved, the final position of each time of mold opening is within the range where a mechanical arm can take a product, and the safety and accuracy of the mechanical arm for taking the product are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of mold opening of injection molding machines, in particular to a method for controlling the repeat positioning accuracy of a mold opening endpoint of an injection molding machine. Background Art

[0002] The repeatable positioning accuracy of the mold opening end point of the injection molding machine refers to the ability of the injection molding machine to repeatedly reach the same or similar end point position in multiple mold opening actions. It is an important indicator of the injection molding machine in the production process, affecting the precision and stability of injection molding. And now with the increase in labor costs and the popularization of automation, the removal of molded products of injection molding machines has changed from manual removal to robot removal. If the consistency of mold opening positioning accuracy is poor, there will be the following two situations: the actual end point position of the mold opening gradually becomes smaller, and the actual end point position of the mold opening is less than the preset position of the robot to pick up the part, and the robot will have the risk of collision damage when picking up the part; the actual end point position of the mold opening gradually becomes larger, and the actual end point position of the mold opening is greater than the preset position of the robot to pick up the part, which will cause the robot to pick up the part. Failure.

[0003] The general mold opening parameters of injection molding machines include: mold opening end position, mold opening pressure, mold opening flow rate and mold opening slope. In the specific production process, the mold cavity pressure, mechanical friction and even oil temperature at different time points will have certain changes. If only fixed mold opening parameters are used, the final mold opening end position will inevitably be inconsistent due to the change in value in each cycle. Based on this, how to effectively control the repeated positioning accuracy of the injection molding machine mold opening end position during the production process has become an urgent problem to be solved. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for controlling the repeatability positioning accuracy of the mold opening end point of an injection molding machine, which is used to control the repeatability positioning accuracy of the mold opening end point of the injection molding machine during the production process, so that the injection molding machine can repeatedly reach the same or similar end point position each time the mold is opened during the production process.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A method for controlling the repeatability positioning accuracy of the mold opening end point of an injection molding machine, the steps are as follows:

[0007] (1) Define key parameters:

[0008] The set end position of mold opening is recorded as S 0 ;

[0009] The actual end point position after the nth mold opening is recorded as S n ;

[0010] The average end point position after the nth mold opening is recorded as S avgn ;

[0011] The virtual target position of mold opening is recorded as S n ';

[0012] Compensation correction factor K 0 ;

[0013] in, The value of n is 1, 2, 3..., 0≤K 0 ≤1;

[0014] (2) Preset parameters:

[0015] Preset the end position S of mold opening on the injection molding machine 0 and compensation coefficient K 0 ;

[0016] (3) The injection molding machine begins formal production;

[0017] (4) Data collection and processing:

[0018] After each mold opening, record the actual end point position S n ;

[0019] The current average end point position S is calculated according to the formula avgn ;

[0020] (5) Target position adjustment:

[0021] According to the S obtained after each mold opening avgn and S n Virtual target position S of split mold n 'Make adjustments;

[0022] If S avgn and S n If there is deviation, use compensation correction factor K 0 Make adjustments:

[0023] If S n >S avgn , then S n '=S n-1 '-K×(S n -S avgn );

[0024] If S n <S avgn , then S n '=S n-1 '+K×(S avgn -S n );

[0025] (6) Repeat cycle control:

[0026] The adjusted virtual target position S for mold openingn 'As the end point position of the next mold opening, perform the next mold opening action;

[0027] Repeat the above steps (4) and (5).

[0028] Compared with the prior art, the advantages of the present invention are: in view of the control method, by monitoring the changes in the mold opening end position of each mold during the automatic production process of the injection molding machine, the control parameters of the mold opening positioning are corrected in real time, thereby effectively improving the mold opening repeated positioning accuracy, so that the end position of each mold opening is within the range that the robot can take the product, ensuring the safety and accuracy of the robot taking the product. DETAILED DESCRIPTION

[0029] The present invention is described in further detail below.

[0030] A method for controlling the repeatability positioning accuracy of the mold opening end point of an injection molding machine, the steps are as follows:

[0031] (1) Define key parameters:

[0032] The set end position of mold opening is recorded as S 0 ;

[0033] The actual end point position after the nth mold opening is recorded as S n ;

[0034] The average end point position after the nth mold opening is recorded as S avgn ;

[0035] The virtual target position of mold opening is recorded as S n ';

[0036] Compensation correction factor K 0 ;

[0037] in, The value of n is 1, 2, 3..., 0≤K 0 ≤1;

[0038] (2) Preset parameters:

[0039] Preset the end position S of mold opening on the injection molding machine 0 and compensation coefficient K 0 ;

[0040] (3) The injection molding machine begins formal production;

[0041] (4) Data collection and processing:

[0042] After each mold opening, record the actual end point position S n ;

[0043] The current average end point position S is calculated according to the formulaavgn ;

[0044] (5) Target position adjustment:

[0045] According to the S obtained after each mold opening avgn and S n Virtual target position S of split mold n 'Make adjustments;

[0046] If S avgn and S n If there is deviation, use compensation correction factor K 0 Make adjustments:

[0047] If S n >S avgn , then S n '=S n-1 '-K×(S n -S avgn );

[0048] If S n <S avgn , then S n '=S n-1 '+K×(S avgn -S n );

[0049] (6) Repeat cycle control:

[0050] The adjusted virtual target position S for mold opening n 'As the end point position of the next mold opening, perform the next mold opening action;

[0051] Repeat the above steps (4) and (5).

[0052] During the entire production process, the above method can be used to continuously compensate and correct the actual end position of the mold opening according to the changes in the end position of each mold opening, so as to ensure that the actual end position reached by each mold opening is within the range of the product that the robot can take.

Claims

1. A method for controlling the repeatability of the mold opening end point of an injection molding machine, characterized in that Here are the steps: (1) Define key parameters: The set end position of mold opening is recorded as S0; The actual end point position after the nth mold opening is recorded as S n ; The average end point position after the nth mold opening is recorded as S avgn ; The virtual target position of mold opening is recorded as S n '; Compensation correction coefficient K0; in, The value of n is 1, 2, 3..., 0≤K0≤1; (2) Preset parameters: Preset the mold opening end position S0 and compensation coefficient K0 on the injection molding machine; (3) The injection molding machine begins formal production; (4) Data collection and processing: After each mold opening, record the actual end point position S n ; The current average end point position S is calculated according to the formula avgn ; (5) Target position adjustment: According to the S obtained after each mold opening avgn and S n Virtual target position S of split mold n 'Make adjustments; If S avgn and S n If there is deviation, use the compensation correction coefficient K0 to adjust: If S n >S avgn , then S n '=S n-1 '-K×(S n -S avgn ); If S n <S avgn , then S n '=S n-1 '+K×(S avgn -S n ); (6) Repeat cycle control: The adjusted virtual target position S for mold opening n 'As the end point position of the next mold opening, perform the next mold opening action; Repeat the above steps (4) and (5).

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