JP2014235034A - Assembling abnormality detector of seal member, and assembling abnormality detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect assembling abnormality of an O-ring in a tank assembling process for a heat exchanger without increasing the production tact immediately before the tank is caulked by a plate.SOLUTION: A detector 20 detects assembling abnormality of an O-ring 4, in a tank assembling process for a heat exchanger in which a pressing load is applied to a tank 3 from a servo cylinder 12, the tank 3 is pressed onto a plate 2 via the O-ring 4, and a caulking allowance 2e of the plate 2 is caulked to fix the tank 3 to the plate 2. The detector 20 includes: a controller 14 for detecting a stroke of the servo cylinder 12; a load cell 21 for measuring the pressing load applied to the tank 3 from the servo cylinder 12; and a computer 22 for detecting assembling abnormality of the O-ring 4 on the basis of the stroke of the servo cylinder 12 detected by the controller 14 and the pressing load measured by the load cell 21.

Description

  The present invention relates to a technique for detecting an assembly abnormality of a seal member that occurs in a tank assembly process for a heat exchanger.

  The tank (upper tank and lower tank) of the heat exchanger is fixed to a plate connected to ends of a plurality of tubes extending in the vertical direction. The tank is fixed by attaching an O-ring to the outer periphery of the plate in order to make the inside of the tank airtight, and crimping the end of the plate with the O-ring compressed by the tank.

  Patent Document 1 discloses an apparatus for inspecting an assembled state of an O-ring attached to a plate with a shape measurement sensor, and an assembly abnormality of an O-ring is generated by assembling a tank after inspecting with the apparatus. Is preventing.

JP 2010-256180 A

  However, in the above-described apparatus, when the O-ring is displaced and caught between the tank and the plate between the inspection of the assembled state of the O-ring and the caulking of the tank with the plate, However, there was a problem that it was impossible to prevent the occurrence of assembly errors. In addition, there is a problem that a process for scanning the entire shape of the O-ring with a shape measuring sensor is required, which increases production tact.

  The present invention has been made in view of such technical problems, and detects an O-ring assembly abnormality in a heat exchanger tank assembly process immediately before caulking a tank with a plate without increasing production tact. The purpose is to do.

  According to an aspect of the present invention, for a heat exchanger that applies a pressing load from a cylinder to a tank, presses the tank against a plate via a seal member, and crimps an end of the plate to fix the tank to the plate. An abnormality detection device for detecting an assembly abnormality of the seal member in a tank assembly process, the stroke detection means for detecting a stroke of the cylinder, and a load measurement for measuring the pressing load acting on the tank from the cylinder And an abnormality detecting means for detecting an assembly abnormality of the seal member based on the stroke of the cylinder detected by the stroke detecting means and the pressing load measured by the load measuring means. An assembling abnormality detecting device for a sealing member is provided.

  Moreover, the detection method is provided.

  According to these aspects, when a pressing load is applied from the cylinder to the tank and the tank is pressed against the plate via the seal member, the assembly state of the seal member can be determined together without increasing the production tact. The assembly abnormality of the seal member can be detected immediately before the tank is caulked with the plate.

It is a schematic block diagram of the assembly | attachment apparatus of the tank for radiators provided with the abnormality detection apparatus which concerns on embodiment of this invention. It is an enlarged view of a caulking part. It is the flowchart which showed the determination procedure of the assembly state of the O-ring by a computer. It is a figure which shows the relationship between the stroke of a servo cylinder, and the pressing load which acts on a tank.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows a schematic configuration of a radiator tank assembling apparatus.

  The assembling apparatus 10 is an apparatus for assembling a resin radiator tank 3 to a metal plate 2 in which ends of a plurality of tubes 1 are brazed and joined. The assembling apparatus 10 includes a pair of rails 11 and a pressing member 13 that can be moved up and down by a servo cylinder 12.

  The rail 11 is a plate-like member erected on a base member (not shown), and is disposed on both sides of the tube 1.

  The plate 2 is placed on the rail 11. A concave groove 2g is formed in the plate 2 along the outer periphery of the plate 2, and an O-ring 4 is attached to the concave groove 2g. The end of the plate 2 is a caulking allowance 2e that is folded inward during caulking. The O-ring 4 is in contact with the lower end 3e of the tank 3 bent in an L shape.

  When the servo cylinder 12 is operated in this state and the pressing member 13 is lowered, the tank 3 is pressed against the plate 2 via the O-ring 4. Since the plate 2 is supported by the rail 11, the O-ring 4 is compressed between the lower end 3 e of the tank 3 and the plate 2. The stroke of the servo cylinder 12 is controlled by a pulse signal from the controller 14.

  Then, when the tank 3 is lowered to the position where the compression of the O-ring 4 is completed, as shown in FIG. 2, the punch 15 is pressed against the caulking allowance 2e from the side, and the caulking allowance 2e is moved inward as indicated by a broken line. When bent, the tank 3 is caulked and fixed to the plate 2.

  At this time, if the O-ring 4 is not properly mounted in the concave groove 2g, the O-ring 4 is caught between the tank 3 and the plate 2 and deformed or damaged, so that the airtightness of the tank 3 is maintained. It ’s gone.

  For this reason, the assembling device 10 is provided with a detection device 20 for detecting an assembly abnormality of the O-ring 4. The detection device 20 includes a load cell 21 and a computer 22 to which an output signal from the load cell 21 and a pulse signal from the controller 14 are input. The load cell 21 is a sensor that is attached between the servo cylinder 12 and the pressing member 13 and measures a pressing load that acts on the tank 3 from the servo cylinder 12 through the pressing member 13.

  As will be described below, the computer 22 determines whether or not the O-ring 4 is normally assembled based on the output signal from the load cell 21 and the pulse signal from the controller 14.

  FIG. 3 is a flowchart showing a procedure for determining the assembled state of the O-ring 4 by the computer 22. Hereinafter, a procedure for determining the assembled state of the O-ring 4 will be described with reference to this.

  First, the computer 22 calculates the stroke of the servo cylinder 12 based on the pulse signal from the controller 14 from the start to the end of the assembly of the tank 3, and the servo 22 based on the output signal from the load cell 21. The pressing load acting on the tank 3 from the cylinder 12 is calculated (S1).

  Next, the computer 22 determines whether the stroke of the servo cylinder 12 when the tank 3 and the pressing member 13 are in contact with each other and a pressing load is generated is larger than a preset compression start determination stroke (S2). ).

  FIG. 4 is a diagram showing the relationship between the stroke of the servo cylinder and the pressing load acting on the tank.

  When the O-ring 4 is normally mounted in the concave groove 2g of the plate 2, the tank 3 and the pressing member 13 come into contact when the stroke of the servo cylinder 12 becomes the stroke StB shown in FIG. When the stroke of the servo cylinder 12 is further increased, the O-ring 4 is compressed, and a pressing load is generated by the compression reaction force. That is, at the stroke StB, the O-ring 4 is not compressed and no pressing load is generated.

  On the other hand, for example, when the O-ring 4 protrudes from the concave groove 2g, the tank 3 is mounted on the plate 2 in a state of riding on the O-ring 4, so that the servo cylinder 12 is more than the stroke StB. In a state where the stroke is small (stroke StA), the tank 3 and the pressing member 13 come into contact with each other, the O-ring 4 is compressed, and a pressing load is generated.

  Therefore, the compression start determination stroke is set so that it can be determined that the O-ring 4 is not properly assembled when a pressing load is generated in a state where the stroke of the servo cylinder 12 is smaller than the stroke StB (stroke StA). For example, a stroke that is 0.5 mm smaller than the stroke StB can be considered as the compression start determination stroke. The stroke StB is a stroke of the servo cylinder 12 where the tank 3 and the pressing member 13 are in contact with each other as described above, and is determined by design.

  If the stroke of the servo cylinder 12 when the pressing load is generated is greater than the compression start determination stroke, the computer 22 proceeds to S3, and if the stroke is less than the compression start determination stroke, the assembly of the O-ring 4 is abnormal. (S6) and the process is terminated.

  Next, the computer 22 sets the compression completion determination load (S3), and the pressing load when the servo cylinder 12 lowers the pressing member 13 to the position where the tank 3 is caulked and fixed to the plate 2 is determined as the compression completion determination. It is determined whether or not it is smaller than the load (S4).

  A stroke StC shown in FIG. 4 is a stroke of the servo cylinder 12 when the pressing member 13 is lowered to a position where the tank 3 is caulked and fixed to the plate 2, and in this state, the compression of the O-ring 4 is completed.

  When the O-ring 4 is not normally attached to the concave groove 2g, or when the O-ring 4 is caught between the tank 3 and the plate 2 between the start of compression and the completion of compression. Since the compression reaction force of the O-ring 4 becomes large, the pressing load (F2) when the stroke of the servo cylinder 12 is StC is larger than the pressing load (F1) when the O-ring 4 is normally assembled. growing.

  Here, the hardness and dimensions of the O-ring 4 vary depending on the production lot, and the hardness also varies with changes in temperature. Therefore, the pressing load at the stroke StC when the O-ring 4 is normally assembled and the pressing load at the stroke StC when the O-ring 4 is abnormally assembled are obtained in advance through experiments or the like. When the compression completion determination load is set on the basis of this, it is conceivable that the pressing load changes due to a change in the lot of the O-ring 4 or the temperature changes, resulting in erroneous determination.

  Therefore, the computer 22 sets the compression completion determination load based on the pressing load measured in the plurality of works assembled most recently, and compares the pressing load of the work being assembled with the O-ring 4 so that the O-ring 4 is properly operated. It is determined whether or not it is assembled.

  As a method for setting the compression completion determination load, for example, 100N is added to the average value calculated by removing the maximum value and the minimum value from the pressing load when the servo cylinder stroke is StC of the five works assembled most recently. It can be considered as an added value.

  When the compression completion determination load is set in this way, for example, even if the temperature is lowered, the hardness of the O-ring 4 being assembled is increased, and the pressing load is increased, the O in the five most recently assembled workpieces. Since the hardness of the ring 4 is increased and the pressing load is increased, the compression completion determination load is automatically set large, and erroneous determination can be prevented.

  When the pressing load when the stroke of the servo cylinder 12 becomes StC is smaller than the compression completion determination load, the computer 22 determines that the O-ring 4 is normally assembled (S5) and ends the process. If the compression determination load is exceeded, it is determined that the assembly of the O-ring 4 is abnormal (S6), and the process is terminated.

  When the computer 22 determines that the O-ring 4 is normally assembled, the assembling apparatus 10 fixes the tank 3 by caulking with the plate 2 and determines that the O-ring 4 is abnormally assembled. Stop without caulking.

  Thus, since the assembly state is determined when the compression of the O-ring 4 is started and when the compression is completed, the compression is started in addition to the case where the O-ring 4 is not normally attached to the concave groove 2g. In the case where the O-ring 4 is caught between the tank 3 and the plate 2 during the period from the start to the completion, it can be detected as an assembly error immediately before the tank 3 is caulked with the plate 2, Yield can be improved.

  Further, when the servo cylinder 12 is operated and the tank 3 is pressed against the plate 2 via the O-ring 4, the assembly state of the O-ring 4 is also determined, so that a process for detecting an assembly abnormality of the O-ring 4 is detected. There is no need to provide. Therefore, the assembly abnormality of the O-ring 4 can be detected without increasing the production tact.

  As described above, according to the present embodiment, when a pressing load is applied from the servo cylinder 12 to the tank 3 and the tank 3 is pressed against the plate 2 via the O-ring 4, the set of the O-ring 4 is combined. Since the attachment state can be determined, the assembly abnormality of the O-ring 4 can be detected immediately before the tank 3 is caulked with the plate 2 without increasing the production tact.

  The embodiment of the present invention has been described above, but the above embodiment is merely a part of an application example of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. is not.

  For example, in the above-described embodiment, the O-ring 4 is provided as a seal member that maintains the airtightness of the tank 3, but the present invention can be applied even when an angular cross-section ring or an X-section ring is provided.

  Further, the present invention is applied to the radiator tank assembling apparatus 10, but may be applied to a heat exchanger tank assembling apparatus such as a charge air cooler or a sub-radiator.

12 Servo cylinder (cylinder)
14 Controller (Stroke detection means)
2 Plate 2e Caulking allowance (end)
3 Tank 4 O-ring (seal member)
20 Detection device (Abnormality detection device)
21 Load cell (Pressing load measuring means)
22 Computer (Abnormality detection means)

Claims (4)

A pressing load is applied to the tank from the cylinder, the tank is pressed against the plate via the sealing member, and the end of the plate is crimped to fix the tank to the plate. An abnormality detection device for detecting an assembly error,
Stroke detecting means for detecting the stroke of the cylinder;
Load measuring means for measuring the pressing load acting on the tank from the cylinder;
An abnormality detecting means for detecting an assembly abnormality of the seal member based on a stroke of the cylinder detected by the stroke detecting means and the pressing load measured by the load measuring means;
An assembly abnormality detection device for a seal member, comprising: An assembly abnormality detection device for a seal member according to claim 1,
The abnormality detection unit is configured such that when the cylinder load detected by the stroke detection unit is smaller than a compression start determination stroke when the pressing load is generated by the load measurement unit, the cylinder is detected by the cylinder. Abnormal assembly of the seal member in at least one of the case where the pressing load measured by the load measuring means is larger than the compression completion determination load when the tank is pressed to the position where the tank is caulked and fixed To determine,
An assembly abnormality detection device for a seal member, characterized in that An assembly abnormality detection device for a seal member according to claim 2,
The compression completion determination load is set based on the pressing load measured in a plurality of works assembled most recently.
An assembly abnormality detection device for a seal member, characterized in that A pressing load is applied to the tank from the cylinder, the tank is pressed against the plate via the sealing member, and the end of the plate is crimped to fix the tank to the plate. An abnormality detection method for detecting an assembly error,
Detecting the stroke of the cylinder,
Measure the pressing load acting on the tank from the cylinder,
Detecting an assembly error of the seal member based on the detected stroke of the cylinder and the measured pressing load;
An assembly abnormality detection method for a seal member, characterized in that:

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