Method for monitoring unbalance loading of punching machine in real time

Abstract

The invention discloses a real-time monitoring method for unbalance loading of a punching machine. The method is characterized in that loads of a left connecting rod and a right connecting rod on the punching machine are detected in real time; the method comprises the following steps: deducing a general relational expression of an unbalance loading force F based on a torsion balance principle, setting a relational expression of a reference position unbalance loading resultant force F 'in a control system of a punching machine, comparing a real-time load difference value F0 of a left connecting rod and a right connecting rod with the reference position unbalance loading resultant force F', and when F0 is more than or equal to 0.8 F 'and less than F', giving out an early warning by the control system; when F0 is larger than or equal to F ', the control system controls the punching machine to stop emergently and gives an alarm; the method has the advantages that the unbalance loading condition of the punching machine can be monitored and early warned in real time, an operator does not need to judge the unbalance loading condition of equipment by himself, and reliable protection is provided for the equipment and a die by adopting a graded early warning mode; meanwhile, due to real-time monitoring and early warning of unbalance loading of the punching machine, the stability and reliability of punching precision are ensured, the quality of punched products is improved, and the product size deviation and the rejection rate caused by unbalance loading are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of punching machines, and in particular to a real-time monitoring method for eccentric load of a punching machine. Background Art

[0002] Overload refers to the uneven distribution of load on the punch slide during the stamping process on progressive die and multi-station presses, resulting in a significantly greater load on one side than the other. Severe overload not only reduces the punch press's accuracy and increases dimensional deviation in the resulting product, compromising product quality, but can also damage the equipment and die. Operating a punch press under long-term overload conditions can lead to deformation, increased slide wear, and fatigue damage to the connecting rod mechanism, significantly shortening the equipment's service life and increasing maintenance costs and downtime.

[0003] The punching equipment currently on the market has obvious deficiencies in dealing with the problem of overloading. Most punching equipment will not actively issue warnings or shut down in the case of overloading as long as it does not reach an overload state. They only prompt the operator through the overload load curve, which requires the operator to judge whether it exceeds the allowable value of the equipment. However, this method has great safety hazards. On the one hand, the operator may not be able to accurately judge the overloading situation due to lack of experience, negligence, etc., which may cause the equipment to run for a long time in an overloaded state, increasing the risk of equipment damage. On the other hand, even if the operator can detect the overloading problem in time, due to the lack of effective warning and protection mechanisms, it is impossible to take timely measures to avoid damage to the equipment and molds. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a real-time monitoring method for overloading of a punch press, which can monitor and warn the overloading situation of the punch press in real time without the need for the operator to make judgments. When the overloading is serious, the punch press can be automatically controlled to stop to avoid damage to the punch press and the mold.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a real-time monitoring method for eccentric load of a punch press, comprising the following specific steps: (1) Real-time detection of the load on the left and right connecting rods of the punch press; (2) Based on the principle of torsion balance, the general relationship of the eccentric load force F is derived, and the relationship of the reference position eccentric load resultant force F' is set in the control system of the punch press: , , Where: P is the nominal load of the punch press, B is the width of the punch press slide, n is the ratio of the eccentric load resultant force to the nominal load P at the position of the slide width B / 4, x is the distance from the center of the slide, S is the distance between the left and right connecting rods of the punch press, and the eccentric load reference position x=S / 2 is set to obtain the relationship between the reference position eccentric load resultant force F'; (3) Compare the real-time load difference F0 between the left and right connecting rods with the reference position eccentric load resultant force F'. When 0.8F'≤F0<F', the control system issues an early warning; when F0≥F', the control system controls the punch press to stop urgently and issues an alarm.

[0006] Furthermore, in the step (1), the real-time loads of the left connecting rod and the right connecting rod are detected by installing strain gauges on the columns on the left and right sides of the punch press.

[0007] Furthermore, in the step (1), the real-time loads of the left connecting rod and the right connecting rod are detected by installing hydraulic sensors in the oil chambers of the worm gear box corresponding to the left connecting rod and the right connecting rod.

[0008] Furthermore, in step (3), the relationship between the real-time load difference F0 of the left connecting rod and the right connecting rod is: , where: F1 is the real-time load of the left connecting rod, and F2 is the real-time load of the right connecting rod.

[0009] Furthermore, the maximum loads of the left and right connecting rods can be set separately in the control system. When it is detected that the real-time load of one of the left and right connecting rods exceeds its corresponding maximum load, the control system controls the punch press to stop urgently and issues an alarm.

[0010] Furthermore, a data recording module may be provided in the control system to record the complete operating data of the punching machine.

[0011] Compared with the existing technology, the advantage of the present invention is that this method can monitor and warn the overload situation of the punch press in real time, without the operator having to judge the overload situation of the equipment by himself, and adopts a graded warning method to provide reliable protection for the equipment and molds. The first-level warning can promptly remind the operator when the real-time overload approaches the safety limit, giving them the opportunity to check and adjust the stamping process parameters to avoid further deterioration of the problem. The second-level alarm can cause the punch press to stop urgently when the real-time overload exceeds the safety limit, effectively preventing the punch press and mold from being damaged due to severe overload. At the same time, the real-time monitoring and warning of the overload of the punch press ensures the stability and reliability of the stamping accuracy, improves the quality of the stamped products, and reduces the product size deviation and scrap rate caused by overload. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the punch press of the present invention; Figure 2 Flowchart of the present invention. DETAILED DESCRIPTION

[0013] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0014] like Figure 1-2 As shown, a real-time monitoring method for eccentric load of a punch press includes the following specific steps: (1) Real-time detection of the loads of the left connecting rod 1 and the right connecting rod 2 on the punch press; The load can be obtained by installing strain gauges 4 on the columns 3 on the left and right sides of the punch press, or by installing hydraulic sensors in the oil chambers of the worm gear box 5 corresponding to the left connecting rod 1 and the right connecting rod 2. The conversion between the strain detected by the strain gauge 4 and the load on the connecting rod, and the conversion between the pressure detected by the hydraulic sensor and the load on the connecting rod are both mature technologies currently known in punch presses and are also commonly used methods for measuring the load on the connecting rod, so they will not be described in detail here. (2) Based on the principle of torsion balance, the general relationship of the eccentric load force F is derived, and the relationship of the reference position eccentric load resultant force F' is set in the control system of the punch press: , , Where: P is the nominal load of the punch press, B is the width of the punch press slide 6, n is the ratio of the eccentric load resultant force to the nominal load P at the position of the slide width B / 4. When designing a punch press, n is usually set to 0.2, x is the distance from the center of the slide, S is the distance between the left connecting rod 1 and the right connecting rod 2 of the punch press, and the eccentric load reference position x=S / 2 is set to obtain the relationship between the reference position eccentric load resultant force F'; (3) Compare the real-time load difference F0 (i.e., real-time eccentric load) between the left link 1 and the right link 2 with the reference position eccentric load resultant force F'. The relationship between the real-time load difference F0 is: , where: F1 is the real-time load of the left connecting rod 1, and F2 is the real-time load of the right connecting rod 2; When 0.8F'≤F0<F', the control system issues an early warning, such as displaying a warning message on the operation interface: Warning: The current eccentric load is large (has reached 80% of the allowable value). An audible early warning can also be added, and suggested measures can be prompted on the operation interface, such as: It is recommended to immediately check and adjust the stamping process parameters; When F0 ≥ F', the control system controls the punch press to shut down urgently and issues an alarm. For example, a red alarm is displayed on the operation interface: Serious warning! The eccentric load has exceeded the safety limit, and an audible alarm is added. In addition, the operation interface may also prompt recommended measures: The equipment has automatically shut down, please contact technical personnel for maintenance immediately.

[0015] In addition, in order to facilitate equipment manufacturers and users to check the reasons for punch press overload, a data recording module can be set in the control system to record the complete operating data of the punch press to determine whether there is any illegal operation of the punch press that leads to eccentric load overload, etc., so that users can quickly correct incorrect operating methods to better use or maintain the punch press, and avoid liability disputes between equipment manufacturers and users.

[0016] In addition to real-time monitoring of the overload of the punch press, the maximum loads of the left connecting rod 1 and the right connecting rod 2 can also be set separately in the control system. When it is detected that the real-time load of one of the left connecting rod 1 and the right connecting rod 2 exceeds its corresponding maximum load, the control system controls the punch press to stop urgently and issue an alarm to better ensure the stamping quality of the product and facilitate better maintenance of the punch press.

[0017] The protection scope of the present invention includes but is not limited to the above embodiments, and its protection scope is subject to the claims. Any replacement, deformation, and improvement of this technology that can be easily thought of by those skilled in the art fall within the protection scope of the present invention.

Claims

1. A real-time monitoring method for punching machine eccentric load, characterized in that The specific steps include: (1) Real-time detection of the load on the left and right connecting rods of the punch press; (2) Based on the principle of torsion balance, the general relationship of the eccentric load force F is derived, and the relationship of the reference position eccentric load resultant force F' is set in the control system of the punch press: ， ， Where: P is the nominal load of the punch press, B is the width of the punch press slide, n is the ratio of the eccentric load resultant force to the nominal load P at the position of the slide width B / 4, x is the distance from the center of the slide, S is the distance between the left and right connecting rods of the punch press, and the eccentric load reference position x=S / 2 is set to obtain the relationship between the reference position eccentric load resultant force F'; (3) Compare the real-time load difference F0 between the left and right connecting rods with the reference position eccentric load resultant force F'. When 0.8F'≤F0<F', the control system issues an early warning; when F0≥F', the control system controls the punch press to stop urgently and issues an alarm.

2. A real-time monitoring method for eccentric loading of a punch press according to claim 1, characterized in that: In the step (1), the real-time loads of the left connecting rod and the right connecting rod are detected by installing strain gauges on the columns on the left and right sides of the punch press.

3. A real-time monitoring method for eccentric loading of a punch press according to claim 1, characterized in that: In the step (1), the real-time loads of the left connecting rod and the right connecting rod are detected by installing hydraulic sensors in the oil chambers of the worm gear box corresponding to the left connecting rod and the right connecting rod.

4. A real-time monitoring method for eccentric loading of a punch press according to claim 1, characterized in that: In step (3), the relationship between the real-time load difference F0 of the left connecting rod and the right connecting rod is: , where: F1 is the real-time load of the left connecting rod, and F2 is the real-time load of the right connecting rod.

5. The real-time monitoring method for eccentric loading of a punch press according to claim 1, characterized in that: The maximum loads of the left and right connecting rods can also be set separately in the control system. When it is detected that the real-time load of one of the left and right connecting rods exceeds its corresponding maximum load, the control system controls the punch press to stop urgently and issues an alarm.

6. A real-time monitoring method for eccentric loading of a punch press according to claim 1, characterized in that: A data recording module can also be set up in the control system to record the complete operating data of the punching machine.

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