Capacitive displacement sensor-based method for measuring gap between concave die and convex die of stamping die

Abstract

The invention relates to the technical field of press concave-convex die gap measurement, in particular to a stamping die concave-convex die gap measurement method based on a capacitive displacement sensor. According to the stamping die concave-convex die gap measuring method based on the capacitive displacement sensor, the capacitive displacement sensor comprises an upper circular ring pole plate, a lower circular ring pole plate, an insulating spring and an insulating shell, the upper insulating shell is arranged on the outer side of the upper circular ring pole plate, and the lower insulating shell is arranged on the outer side of the lower circular ring pole plate; the upper and lower ends of the insulating spring respectively penetrate through the upper and lower circular polar plates and are connected with the upper and lower insulating shells. Compared with the prior art, by utilizing the capacitive displacement sensor, when the upper die is pressed down, the upper polar plate is pressed down, so that the polar distance between the two polar plates is changed, the capacitance is changed, the voltage is changed, a voltage signal is transmitted to the computer through the signal line, and the polar distance is calculated by the computer through the voltage; and the sum of the polar distance and the thicknesses of the two polar plates is the upper and lower die distance corresponding to the hole.

Description

Technical Field

[0001] The invention relates to the technical field of press die gap measurement, in particular to a stamping die gap measurement method based on a capacitive displacement sensor. Background Art

[0002] In industrial production, concave and convex dies are widely used in manufacturing, especially in the fields of plastic molding, metal stamping and die casting. During the stamping process, the die may produce small elastic deformation due to the extrusion of the workpiece, and as the number of uses increases, the die may produce plastic deformation, which will cause changes in the die gap. Changes in the die gap will lead to dimensional deviations and surface defects of the product. The accuracy of the concave and convex dies directly affects the quality and production efficiency of the product. Therefore, the measurement and control of the die gap is very important, especially in high-precision processing. The concave and convex die gap needs to be strictly controlled to ensure processing accuracy and consistency.

[0003] The current methods for measuring the gap between the concave and convex dies of a press are mainly the lead wire method and the red lead covering method. The measurement errors of these two methods are relatively large, especially the red lead covering method, which can only judge the uniformity of the gap between the concave and convex dies by the red lead marks on the die surface, and is empirical and time-delayed. Both methods require a lot of manpower and material resources, take a long time to prepare, and take a long time to test, and cannot achieve real-time measurement. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a method for measuring the gap between a punch and a die of a stamping die based on a capacitive displacement sensor, which can improve the accuracy of measuring the gap between the punch and die of a press, reduce the manpower and time for detection, improve detection efficiency, and realize real-time measurement.

[0005] To achieve the above purpose, a method for measuring the gap between a stamping die and a convex die based on a capacitive displacement sensor is designed, comprising a capacitive displacement sensor, characterized in that: the capacitive displacement sensor comprises an upper annular plate, a lower annular plate, an insulating spring, and an insulating shell, an upper insulating shell is provided on the outer side of the upper annular plate, a lower insulating shell is provided on the outer side of the lower annular plate, and the upper and lower ends of the insulating spring respectively penetrate the upper annular plate and the lower annular plate and are connected to the upper insulating shell and the lower insulating shell; The stamping die concave and convex die gap measurement method is as follows: (1) Clean the die surface of the press: clean the debris and foreign matter on the die surface of the upper die and the lower die to prevent it from affecting the measurement accuracy; (2) Processing the workpiece: record the points to be measured on the workpiece, cut a measuring hole for placing the capacitive displacement sensor at the point to be measured, and open a wire groove next to the measuring hole for placing the signal line; (3) Install and position the workpiece: Place the processed workpiece on the lower die and position and compact it; (4) Installing the capacitive displacement sensor: Place the lower annular electrode plate with the lower insulating shell of the capacitive displacement sensor into the measuring hole on the mold surface of the lower mold and fix it with glue; (5) Connect the signal line: embed the signal line of the capacitive displacement sensor into the wire groove of the workpiece and fix it with glue; connect the capacitive displacement sensor, signal collector, and computer; (6) Measuring the pole distance of the two plates after the upper die is pressed down: starting the press, the signal collector receives the voltage signal, the voltage signal is transmitted to the computer, and the computer calculates the pole distance of the two plates after the upper die is pressed down; (7) Result analysis: The measured pole pitch is added to the thickness of the upper annular pole plate, the lower annular pole plate and the upper insulating shell, and the lower insulating shell to obtain the distance between the upper and lower mold gaps.

[0006] The upper annular electrode plate and the lower annular electrode plate are both annular structures.

[0007] The inner diameter of the lower annular electrode plate is smaller than the inner diameter of the upper annular electrode plate, and the outer diameter of the lower annular electrode plate is larger than the outer diameter of the upper annular electrode plate.

[0008] The lower annular electrode plate of the capacitive displacement sensor is embedded in the point to be measured on the workpiece, and the capacitive displacement sensor is connected to the computer through a signal line.

[0009] The capacitive displacement sensor and the computer are connected to a signal collector via a signal line.

[0010] The signal line is placed in a signal line groove on the workpiece.

[0011] Compared with the prior art, the present invention provides a method for measuring the gap between a concave and convex die of a stamping die based on a capacitive displacement sensor. By using the capacitive displacement sensor, when the upper die is pressed down, the upper electrode plate is pressed down, so that the pole distance between the two electrodes changes, thereby changing the capacitance. The change in capacitance causes a voltage change, and the voltage signal is transmitted to a computer through a signal line. The computer calculates the pole distance through voltage calculation. The sum of the pole distance and the thickness of the two electrodes is the upper and lower die distance corresponding to the hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the capacitive displacement sensor of the present invention.

[0013] Figure 2 It is a schematic diagram of the arrangement of the capacitive displacement sensor of the present invention.

[0014] Figure 3 Flow chart of the gap measurement implementation steps of the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] In industrial production, concave and convex dies are widely used in manufacturing, especially in the fields of plastic molding, metal stamping and die casting. During the stamping process, the die may produce small elastic deformation due to the extrusion of the workpiece, and as the number of uses increases, the die may produce plastic deformation, which will cause changes in the die gap. Changes in the die gap will lead to dimensional deviations and surface defects of the product. The accuracy of the concave and convex dies directly affects the quality and production efficiency of the product. Therefore, the measurement and control of the die gap is very important, especially in high-precision processing. The concave and convex die gap needs to be strictly controlled to ensure processing accuracy and consistency.

[0017] The current methods for measuring the gap between the concave and convex dies of a press are mainly the lead wire method and the red lead covering method. The measurement errors of these two methods are relatively large, especially the red lead covering method, which can only judge the uniformity of the gap between the concave and convex dies by the red lead marks on the die surface, and is empirical and time-delayed. Both methods require a lot of manpower and material resources, take a long time to prepare, and take a long time to test, and cannot achieve real-time measurement.

[0018] In order to solve the above technical defects, the present application proposes a method for measuring the gap between the concave and convex dies of a press, and the measuring equipment and specific implementation steps are as follows: like Figure 1 As shown, the capacitive displacement sensor includes an upper annular plate, a lower annular plate, an insulating spring, and an insulating shell. An upper insulating shell 1 is provided on the outer side of the upper annular plate 2, and a lower insulating shell 5 is provided on the outer side of the lower annular plate 3. The upper and lower ends of the insulating spring 4 respectively penetrate the upper annular plate 2 and the lower annular plate 3 and are connected to the upper insulating shell 1 and the lower insulating shell 5.

[0019] The upper annular plate 2 and the lower annular plate 3 are both annular structures. The inner diameter of the lower annular plate 3 is smaller than the inner diameter of the upper annular plate 2 , and the outer diameter of the lower annular plate 3 is larger than the outer diameter of the upper annular plate 2 .

[0020] The upper insulating shell 1 and the lower insulating shell 5 are respectively wrapped around the outer sides of the upper annular plate 2 and the lower annular plate 3 to separate the two plates from the mold surface. The insulating spring 4 is fixedly connected to the upper insulating shell 1 and the lower insulating shell 5 to support the upper and lower plates so that the upper annular plate 2 can move downward when pressed. The inner diameter of the lower annular plate 3 is smaller than that of the upper annular plate 2, and the outer diameter is larger than that of the upper annular plate 2. This can prevent the upper annular plate 2 from moving horizontally to the left and right when moving downward, resulting in changes in the corresponding area of ​​the plate that affect the measurement results.

[0021] The workpiece 9 is a workpiece that has been pre-stamped and has been cut with measuring holes and signal line slots. The measuring holes are used to place and position the capacitive displacement sensor, and the signal line slots are used to place the signal lines to prevent the signal lines from being pressed and failing.

[0022] The data line is used to connect the capacitive displacement sensor with the data collector, and to connect the data collector with the computer. Its function is to transmit signals. The data collector is used to collect and save the voltage signal of the capacitive displacement sensor, and can simultaneously collect the voltage signals of multiple capacitive displacement sensors through multiple channels.

[0023] The power supply provides voltage and converts the pole pitch change value into a voltage change value.

[0024] The function of the computer is to analyze and process the signals collected by the data collector, such as filtering and smoothing the collected signals, and converting the change value of the electrical signal into a displacement change value.

[0025] like Figure 2 , Figure 3 As shown, the measurement steps of the present invention are as follows: (1) Clean the die surface of the press: clean the debris and foreign matter on the die surface of the upper die 6 and the lower die 7 to prevent them from affecting the measurement accuracy; (2) Processing the workpiece: Record the points to be measured on the workpiece 9, cut a measuring hole for placing the capacitive displacement sensor at the point to be measured, and open a wire groove next to the measuring hole for placing the signal line 8; (3) Installing and positioning the workpiece: placing the processed workpiece on the lower die 7 and positioning and compacting it; (4) Installing the capacitive displacement sensor: placing the lower annular electrode plate 3 with the lower insulating housing 5 of the capacitive displacement sensor into the measuring hole on the mold surface of the lower mold 7 and fixing it with glue; (5) Connecting the signal line: embed the signal line of the capacitive displacement sensor into the wire groove of the workpiece 9 and fix it with glue; connect the capacitive displacement sensor, signal collector, and computer; (6) Measuring the pole distance of the two plates after the upper die is pressed down: starting the press, the signal collector receives the voltage signal, the voltage signal is transmitted to the computer, and the computer calculates the pole distance of the two plates after the upper die is pressed down; (7) Result analysis: The measured pole pitch is added to the thickness of the upper annular pole plate 2, the lower annular pole plate 3 and the upper insulating shell 1, the lower insulating shell 5 to obtain the distance between the upper and lower mold gaps.

Claims

1. A method for measuring the gap between a stamping die and a convex die based on a capacitive displacement sensor, comprising a capacitive displacement sensor, characterized in that: The capacitive displacement sensor comprises an upper annular electrode plate, a lower annular electrode plate, an insulating spring, and an insulating shell. An upper insulating shell (1) is provided on the outer side of the upper annular electrode plate (2), and a lower insulating shell (5) is provided on the outer side of the lower annular electrode plate (3). The upper and lower ends of the insulating spring (4) respectively penetrate the upper annular electrode plate (2) and the lower annular electrode plate (3) and are connected to the upper insulating shell (1) and the lower insulating shell (5). The stamping die concave and convex die gap measurement method is as follows: (1) Clean the die surface of the press: clean the debris and foreign matter on the die surface of the upper die (6) and the lower die (7) to prevent them from affecting the measurement accuracy; (2) Processing the workpiece: recording the points to be measured on the workpiece (9), cutting a measuring hole for placing the capacitive displacement sensor at the points to be measured, and opening a wire groove for placing the signal wire (8) next to the measuring hole; (3) Installing and positioning the workpiece: placing the processed workpiece on the lower die (7) and positioning and compacting it; (4) Installing the capacitive displacement sensor: placing the lower annular electrode plate (3) with the lower insulating housing (5) of the capacitive displacement sensor in the measuring hole on the mold surface of the lower mold (7) and fixing it with glue; (5) Connecting the signal line: embed the signal line of the capacitive displacement sensor into the wire groove of the workpiece (9) and fix it with glue; connect the capacitive displacement sensor, the signal collector, and the computer; (6) Measuring the pole distance of the two plates after the upper die is pressed down: starting the press, the signal collector receives the voltage signal, the voltage signal is transmitted to the computer, and the computer calculates the pole distance of the two plates after the upper die is pressed down; (7) Result analysis: The measured pole distance is added to the thickness of the upper annular pole plate (2), the lower annular pole plate (3) and the upper insulating shell (1) and the lower insulating shell (5), and the distance between the upper and lower mold gaps is obtained.

2. The method for measuring the gap between the concave and convex dies of a stamping die based on a capacitive displacement sensor according to claim 1, characterized in that: The upper annular electrode plate (2) and the lower annular electrode plate (3) are both annular structures.

3. The method for measuring the gap between the concave and convex dies of a stamping die based on a capacitive displacement sensor according to claim 1 or 2, characterized in that: The inner diameter of the lower annular electrode plate (3) is smaller than the inner diameter of the upper annular electrode plate (2), and the outer diameter of the lower annular electrode plate (3) is larger than the outer diameter of the upper annular electrode plate (2).

4. The method for measuring the gap between the concave and convex dies of a stamping die based on a capacitive displacement sensor according to claim 1, characterized in that: The lower annular electrode plate (3) of the capacitive displacement sensor is embedded in a point to be measured on the workpiece, and the capacitive displacement sensor is connected to a computer via a signal line.

5. The method for measuring the gap between the concave and convex dies of a stamping die based on a capacitive displacement sensor according to claim 4, characterized in that: The capacitive displacement sensor and the computer are connected to a signal collector via a signal line.

6. The method for measuring the gap between the concave and convex dies of a stamping die based on a capacitive displacement sensor according to claim 1, characterized in that: The signal line is placed in a signal line groove on the workpiece.

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