KR102485111B1 - Monitoring Apparatus for Bonding Quality of Product Manufactured Using Bonding Tool - Google Patents

Abstract

The present invention relates to a monitoring device capable of immediately checking the joint quality of a product in the process of joining two objects to be joined by a joining tool and determining whether or not it is good. To monitor the joint quality of products produced using a joining tool that joins two objects to be joined by deforming the machine element by pulling an action rod inserted into the hollow of the machine element and fixed at one end of the machine element toward the other end A device comprising: a sensor for detecting a change in torque in a process in which the action rod of the joining tool is separated from the machine element; It provides a device for monitoring the bonding quality of a product produced using a bonding tool comprising a; and a control unit that determines whether the product is good or bad by using a change in the current value measured by the sensor.

Description

Apparatus for monitoring the bonding quality of products produced using a bonding tool {Monitoring Apparatus for Bonding Quality of Product Manufactured Using Bonding Tool}

The present invention relates to a monitoring device capable of immediately confirming the joining quality of a product in the process of joining two objects to be joined using a joining tool and determining whether the product is good or bad.

As a recently used joining tool, a machine element such as a rivet or pop nut is inserted through two joining objects, and an action rod inserted into the hollow of the machine element and fixed to one end of the machine element is pulled toward the other end. A tool such as a blind rivet or a pop nut that joins two objects to be joined by deforming a machine element is well known.

Blind rivet tool is a tool for easily and quickly joining objects to be joined using rivets, which are widely used in various fields of the industry. A mechanical element (usually referred to as a 'blind rivet') is used to fix the object to be joined.

In particular, there is an increasing tendency to use blind rivet tools when joining dissimilar materials that cannot be welded, such as between a steel material and an aluminum material or between an aluminum material and a plastic material when assembling overlapping materials. .

Blind is a word that originally means blind, and is a term used to refer to a situation where all joining work must be completed from the front because the operator's hand or vision cannot access the back of the joint object, and when using blind rivet tools It has advantages such as fast operation, permanent fastening, and low operation cost.

In addition, even in the case of a pop-nut joining tool, it performs a function similar to a blind rivet tool in that it can perfectly join between objects to be joined just by working a mechanical element on one side of the object to be joined, like a blind rivet tool.

However, after the joining operation by using the blind rivet tool or the pop nut tool, various causes such as operator's mistake or poor mounting of mechanical elements may cause defective joining of objects to be joined, and the degree of defect may be insignificant or visually confirmed. If this is not possible, a problem arises in supplying undesirable defective products to consumers.

In addition, these blind rivet tools and pop-nut joint tools are mainly configured to be driven by air pressure as a pneumatic type, but poor coupling may occur due to a decrease in air pressure that may occur in the general joining process.

In order to overcome this problem, the inventors of the present invention have arrived at the present invention to provide inspection equipment that can easily inspect the quality of a product by measuring the pressure change of air flowing into a tool every moment during a bonding operation.

Registered Utility Model No. 20-0169411 (2000.02.15. Notice) Registered Patent No. 10-1776483 (2017.09.08. Notice)

An object of the present invention is to provide a monitoring device capable of immediately checking the joining quality of objects to be joined by detecting a change in torque at the moment when an action rod moving in translation by the power of a joining tool is separated from a mechanical element. Other objects of the present invention can all be achieved by the detailed description of the present invention described with reference to the accompanying drawings.

In order to achieve the above object, the present invention inserts a mechanical element through two joining objects and deforms the mechanical element by pulling an action rod inserted into a hollow of the mechanical element and fixed to one end of the mechanical element toward the other end. As a device for monitoring the joining quality of a product produced using a joining tool that joins two joining objects by doing so, a sensor for detecting a change in torque in the process of separating the operating rod of the joining tool from the mechanical element. ; It provides a device for monitoring the bonding quality of a product produced using a bonding tool comprising a; and a control unit that determines whether the product is good or bad by using a change in the current value measured by the sensor.

In addition, as another aspect of the present invention, the present invention inserts a mechanical element through two objects to be joined, and pulls an action rod inserted into the hollow of the mechanical element and fixed to one end of the mechanical element toward the other end by hydraulic pressure. A device for monitoring the joining quality of a product produced using a joining tool that joins two joining objects by deforming a mechanical element, comprising: an air branching unit connected to an air supply pipe of the joining tool; an air branch pipe connected to the air branch part in parallel with the air supply pipe; an air pressure sensor installed in the air branch pipe to measure the air pressure supplied to the joining tool; It provides a device for monitoring the bonding quality of a product produced using a bonding tool including; and a control unit that determines whether a product is good or bad by using the air pressure measured by the air pressure sensor.

In the present invention, the control unit includes a reference pattern storage unit for storing a reference pressure change pattern that is a standard measured by the air pressure sensor in a process in which the joining tool deforms the mechanical element by hydraulic pressure; a pattern comparison unit that compares a current reference pressure change pattern measured in the process of transforming a mechanical element in which a current work is performed with the reference pressure change pattern; and a quality determination unit that determines the bonding quality of the current machine element according to the comparison result of the pattern comparison unit.

In addition, in the present invention, the reference pressure change pattern is i) a second section in which the mechanical element is deformed by pulling the operating rod while the air pressure increases, ii) the operating rod is broken and retreated from the mechanical element, thereby instantly reducing the air pressure iii) a fourth period in which the air pressure increases to the operating standby pressure in the process of filling the air cylinder with air.

In addition, the present invention can determine the thickness of the base material, whether or not the base material is used, the type, strength, and quality of the mechanical element by using the pressure difference in the third section and the time to reach the lowest point in the third section.

According to the device for monitoring the joining quality of products produced using the joining tool of the present invention, the advantage of being able to easily determine the quality of the product and the presence or absence of materials immediately whenever a work is performed using the joining tool there is

1 shows an example of a commonly used pneumatic riveting machine.
2 is a process diagram showing a process in which a mechanical element is coupled to a bonding object during a bonding operation by a general bonding tool;
Figure 3 is a schematic configuration diagram of an apparatus for monitoring the bonding quality of products produced using a bonding tool according to one embodiment of the present invention;
4 is a graph showing a reference pressure change pattern of an apparatus for monitoring the joining quality of a product produced using a joining tool according to an embodiment of the present invention; and
5 to 7 are views of display windows showing graphs of changes in pressure formed when mechanical elements having different strengths are used.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Terms or words used in this specification and claims should not be construed as being limited to ordinary or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical details of the present invention.

1 shows an example of a commonly used pneumatic riveting machine, and FIG. 2 is a bonding process diagram showing a process in which a mechanical element is coupled to a bonding object during a bonding operation by a general bonding tool.

As shown in FIG. 2 (a), the subject of the present invention, the joining tool inserts the machine element 40 through the two joining objects 1 and 2 and is inserted into the hollow of the machine element, and one end of the machine element. As a device for joining two joining objects 1 and 2 by deforming the mechanical element 40 by pulling the action rod 30 fixed to the other end, the joining operation unit of the joining tool 10 in FIG. 2 ( 12) is shown, an action rod 30 that is mounted on the joint operation unit 12 and moves in translation, and a bulb-shaped extension 32 at the tip of the action rod 30 is shown, and the mechanical element 40 is As an element for joining metal materials that are deformed by sufficient pressure, a hollow is formed in the center and a flange portion 42 is formed at one end.

In addition, in order to join objects to be joined by the process of FIG. 2, the motion rod 30 of the joining tool must perform a translational motion in the joining operation unit 12 of the joining tool, and the power for this is the translational motion of the rotational force of the motor. It can be achieved by a switching mechanism or by driving a general hydraulic cylinder.

However, regardless of which method is used, in the process of FIG. 2, the action rod 30 is broken and separated from the extension part 32 (a state caught in the mechanical element) that is forcibly fitted to the action rod 30. , an instantaneous change in torque occurs in the movement of the operating rod at this time, and the quality of the currently joined product can be immediately confirmed by using such a change pattern of torque.

That is, the device for monitoring the joining quality of products produced using the joining tool of the present invention is a process in which the action rod 30 of the joining tool 10 is separated from the extension part 32 bound to the mechanical element. It includes a sensor for detecting a change in torque in and a control unit for determining the quality of a product using a change in a current value measured by the sensor. When operating in a configuration that converts to motion, it means a sensor that detects a change in torque generated by a rotating motor, and when a motor driven by current or voltage is used, the sensor that detects the change in torque is It may be a sensor that senses a change in current/voltage applied to, and as will be described later, a hydraulic pressure sensor will be used if the operating rod 30 of the bonding device moves in a translational motion by hydraulic pressure.

Figure 3 is a schematic configuration diagram of an apparatus for monitoring the bonding quality of a product produced using a bonding tool according to one embodiment of the present invention, Figure 4 is using a bonding tool according to one embodiment of the present invention It is a graph showing the standard pressure change pattern of the device for monitoring the joint quality of the product produced by

Referring to FIG. 3, as another aspect of the present invention, the present invention inserts a mechanical element through two bonding objects, and inserts the action rod inserted into the hollow of the mechanical element and fixed to one end of the mechanical element to the other side by hydraulic pressure. A device for monitoring the joining quality of a product produced using a joining tool 10 that joins two joining objects by deforming a mechanical element by pulling in an end direction is provided, and as a specific configuration, the present invention provides an air branching unit 110 ), an air branch pipe 120, an air pressure sensor 130, and a controller 100.

The air branch 110 is connected to the air supply pipe 22 of the joining tool, and is located close to the air cylinder device 20 formed at the lower end of the handle of the joining tool 10 unless otherwise restricted. It is desirable to install

The air branch pipe 120 is connected to the air branch part 110 in parallel with the air supply pipe 22 so that the pressure of air (compressed air) supplied through the air supply pipe 22 can be accurately sensed. do.

The air pressure sensor 130 is installed in the air branch pipe 120 to measure the pressure of air supplied to the joining tool 10, and may be installed in the controller 100, but preferably , By installing it close to the air branching part 110, it is possible to prevent a drop in branched air pressure, measure the air pressure more accurately, and transmit measurement data to the control unit 100.

The control unit 100 is a component that determines the quality of a product using the air pressure measured by the air pressure sensor,

In addition, a display unit 140 is further installed in the control unit 100 to display the instantaneously measured change in pressure as a numerical value or a graph so that a manager can visually manage the process.

In the present invention, the control unit 100 includes a reference pattern storage unit for storing a reference pressure change pattern, which is a standard measured by the air pressure sensor in the process of the joining tool deforming a mechanical element by hydraulic pressure, and a current operation Including a pattern comparison unit for comparing the current reference pressure change pattern measured in the process of deforming the machine element with the reference pressure change pattern, and a quality determination unit for determining the joint quality of the current machine element according to the comparison result of the pattern comparison unit can be configured.

4 shows a change pattern with time of air injected into the air cylinder 20 of the joining tool during the joining operation according to the present invention. Referring to FIG. 4 , in the present invention, the reference pressure change pattern includes three main change patterns, which are for changes in the interval from t2 to t5.

That is, in the present invention, the reference pressure change pattern is i) the second section (t2 to t3) in which the mechanical element is deformed by pulling the operating rod while the air pressure increases, ii) the operating rod is broken from the expansion part constrained to the mechanical element iii) A fourth period (t4 to t5) in which the air pressure increases to the operating standby pressure (Pm) in the process of filling the air cylinder with air. can include

In the drawing, the air pressure (compressor supply pressure) measured by the air pressure sensor 130 connected to the front end of the air cylinder 20 of the joining tool 10 before the joining operation is performed is the joining tool 10 and the air cylinder 20 It is shown larger, this is due to the phenomenon that the air of the air cylinder 20 finely escapes to the outside before pulling the trigger provided on the handle to match the air pressure of the air cylinder 20 to the compressor supply pressure.

When the trigger is pulled, a section (~ t1) in which the supply pressure of the compressor momentarily drops occurs, which occurs when the air pressure measured by the air pressure sensor momentarily decreases as air is supplied to the air cylinder 20.

Next, as a section in which the pressure is equalized by completely communicating between the air cylinder 20 and the air supply pipe 22, the first section (t1 to t2), which is a section in which the compressor supply pressure is temporarily maintained, follows, As a result, the piston of the air cylinder 20 moves, and accordingly, the second section, which is a section that causes the actual translational movement of the operating rod directly operated according to the translational movement (retracting action) of the piston of the hydraulic cylinder, follows. In the second section, the piston of the air cylinder moves in proportion to the pressure of the air applied to the air cylinder, and accordingly, the piston of the hydraulic cylinder moves, causing the mechanical element to deform as the operating rod moves backward.

In addition, the present invention uses the pressure difference (P(t3)-P(t4)) of the third section and the time (t4) to reach the lowest point of the third section to determine the thickness of the base material, whether or not the base material is used, and the machine It is possible to determine the type, strength, and quality of the element.

The third section is a section (t3 to t4) in which the air pressure is momentarily reduced when the action rod 30 is broken and retreated from the expansion part 32 constrained to (the front end of) the machine element 40, In the section, the air pressure acting to pull the action rod 30 coupled to the extension part 32 with a strong force is temporarily formed because the resistance of the action rod 30 is reduced while the resistance of the action rod 30 is eliminated. In the section, it is charged with the original operating standby pressure (Pm).

5 to 7 are views of display windows showing graphs of changes in pressure formed when mechanical elements having different strengths are used. Referring to FIGS. 5 to 7 , it can be seen that as the strength of the mechanical element increases, the working time increases and the air pressure difference in the third section increases when the operating rod is broken and separated from the expansion part.

In addition, since the bonding operation time by the bonding tool is very short, less than about 200 ms, it can be seen that accurate measurement is required because high-speed operation is performed during measurement.

When working with a tool such as an air blind rivet tool, there is always a pressure change in the pattern shown in FIG. According to the conventional general method, a method of detecting the extension separated from the operating rod by a proximity sensor is used to determine whether the rivet is mounted, but according to the present invention, it is possible to easily check whether the rivet is mounted only by the abnormal characteristics of the graph appearing on the display unit 140. There is an advantage to being

In addition, poor rivet work during rivet work can be easily detected by using the graph characteristics of FIG. 4 . Even with the same rivet, there are often cases in which the bonding operation is completed without constant pressure being formed, which is likely to result in a defect in the strength of the rivet itself. Such defective riveting work can be easily identified by comparing the time period of the third section and the pressure difference of the third section with a patterned graph.

Even when the rivet is not sufficiently adhered to the joint object (base material) during the bonding operation, the pressure difference and time interval of the third section change, so that a defect can be detected.

In addition, when the operation button is pressed without rivets installed, when rivets are installed but not riveted to the joint object, and finally when rivets are normally installed and then riveted to the base material, the difference in pressure difference in the third section creates When the operation button is pressed without mounting the rivet, the third section of FIG. 4 is not formed. Accordingly, it is possible to easily check whether the job is an empty drilling operation performed without rivets or a rivet operation in which rivets are effectively mounted. In addition, it is very useful even when determining whether a riveting operation has actually been performed without considering the strength. When the strength of the rivet is not strong, since the pressure difference generated in the third section is very small, when it is difficult to distinguish the poor strength of the rivet, the effective production volume can be counted by referring only to the presence or absence of work.

In addition, there is a difference in the pattern according to the presence or absence of the object to be bonded. That is, when there is an object to be joined, the second section tends to be short and the pressure difference in the third section tends to be larger. Therefore, when the pressure difference between the length of the second section and the third section is out of the predetermined allowable range during the working process, it can be determined that the object to be joined is not coupled.

Since there is no device for monitoring the quality of the current pneumatic joining tool by dividing the pattern as in the present invention, the present invention is particularly needed in the automotive field where verification is required.

Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific embodiments described above, and conventional techniques in the technical field to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Various modifications are possible by those with knowledge. In addition, matters that can be easily inferred from the accompanying drawings should be considered to be included in the content of the present invention even if not described in the detailed description, and various modified implementations should not be individually understood from the technical details or prospects of the present invention. It will be.

1, 2: joining object 10: joining tool
30: motion rod 40: mechanical element (rivet)
100: control unit 110: air branch unit
120: air manifold 130: air pressure sensor
140: display unit

Claims (5)

By inserting a mechanical element through the two joining objects, inserting into the hollow of the mechanical element and pulling the action rod fixed to one end of the mechanical element toward the other end of the mechanical element by hydraulic pressure to deform the mechanical element, joining the two joining objects As a device for monitoring the joining quality of products produced using a joining tool,
an air branching part connected to the air supply pipe of the joining tool;
an air branch pipe connected to the air branch part in parallel with the air supply pipe;
an air pressure sensor installed in the air branch pipe to measure the air pressure supplied to the joining tool; and
a control unit that determines the quality of a product using the air pressure measured by the air pressure sensor;
including,
The control unit includes a reference pattern storage unit for storing a reference pressure change pattern that is a standard measured by the air pressure sensor while the joining tool deforms the machine element by hydraulic pressure;
a pattern comparison unit that compares a current reference pressure change pattern measured in the process of transforming a mechanical element in which a current work is performed with the reference pressure change pattern; and
a quality determination unit for determining the bonding quality of the current machine element according to the comparison result of the pattern comparison unit;
including,
The reference pressure change pattern is i) a second section in which the mechanical element is deformed by pulling the operating rod while the air pressure increases, ii) the air pressure momentarily decreases as the operating rod is broken and retreated from the expansion part constrained to the mechanical element iii) a fourth period in which the air pressure increases to the operating atmospheric pressure in the process of filling the air cylinder with air;
Using the pressure difference in the third section and the time to reach the lowest point in the third section, the thickness of the base material, whether or not the base material is used, and the type, strength, and quality of the machine element are determined using a joining tool characterized in that A device for monitoring the bonding quality of products produced by delete delete delete delete

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