JP2010234394A - Spatter detection device - Google Patents

Abstract

A sputter detection apparatus for detecting spatter and the like attached to a surface is provided.
A sputter detection apparatus for detecting spatter and the like adhering to the surface of a part (1) integrated by welding a plurality of cylindrical or columnar parts, wherein the sputter detection apparatus includes at least one measurement. A gap sensor that detects the amount of movement of the component (1) in the radial direction by the roller (10), the measurement roller support member (14) that supports the measurement roller (10), and the measurement roller (10). (11) In a sputter detection apparatus comprising the component (1) in a rotatable manner and a rotation holding unit that rotationally drives the component (1), obtained from the gap sensor (11). The waveform is differentiated and compared with a predetermined threshold value (a).
[Selection] Figure 1

Description

  The present invention relates to a sputter detection apparatus for detecting spatter generated when welding a plurality of cylindrical or columnar parts.

  Conventionally, for example, as can be seen in Patent Document 1, there has been known an apparatus for performing laser welding by joining a plurality of cylindrical or columnar workpieces. In such an apparatus, if spatter generated during welding adheres to the surface of the work piece and remains, the work piece cannot be inserted or the quality of the product after assembly when the work piece is assembled to another fitting part. In some cases, problems such as defects were caused. Therefore, conventionally, a total visual check process by an operator is required to detect all spatters, and such a total check by such an operator has been a significant cost factor. On the other hand, detection by a visual device is also conceivable, but there are many detection points, and accordingly, a large number of visual devices are required, which is also a high cost factor.

JP 2005-342768 A

  In view of the above problems, the present invention provides a sputter detection apparatus that detects spatter generated when welding a plurality of cylindrical or columnar parts.

  In order to solve the above-mentioned problems, the invention of claim 1 is a sputter detection device for detecting spatter and the like adhering to the surface of a component (1) integrated by welding a plurality of cylindrical or columnar components. The sputter detection device includes at least one measurement roller (10), a measurement roller support member (14) that supports the measurement roller (10), and the measurement roller (10) has a radius of the component (1). In a sputter detection apparatus comprising: a gap sensor (11) that detects a movement amount that moves in a direction; and a rotation holding unit that rotatably holds the component (1) and that rotationally drives the component (1). The sputter detection apparatus determines the presence of spatter by differentiating the waveform obtained from the gap sensor (11) and comparing it with a predetermined threshold (a).

  Thereby, it is possible to automatically and accurately detect that spatter generated during welding remains on the surface of the cylindrical part 1.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the measuring rollers (10) are respectively installed at positions corresponding to the plurality of welded cylindrical or columnar parts. As a result, even if the axes of the plurality of cylindrical parts after welding are slightly deviated, the presence of spatter can be accurately detected in response to such an axis deviation.

  According to a third aspect of the present invention, in the invention according to the first or second aspect, the measuring roller support member (14) slides with a linear guide with respect to the bed (30), and the gap sensor (11) is Further, the measuring roller support member (14) is installed so as to detect a moving amount with respect to the bed (30).

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the waveform obtained from the gap sensor (11) is differentiated to obtain a predetermined threshold value (a) in one cycle. The number of times of exceeding is counted, and the quality of the component (1) is determined based on whether it is less than the predetermined number of times (n). Thereby, the quality as a component when there is little spatter can be discriminated.

  In addition, the code | symbol attached | subjected above is an example which shows a corresponding relationship with the specific embodiment as described in embodiment mentioned later.

It is a schematic diagram explaining one Embodiment of this invention. It is a front view of one embodiment of the present invention. It is a measurement figure which shows an example of the detection waveform of a gap sensor, (a) is a waveform without a sputter | spatter, (b) is a waveform with a sputter | spatter.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. About each embodiment, the same code | symbol is attached | subjected to the part of the same structure, and the description is abbreviate | omitted.
In the case of forming an integrated cylindrical part 1 by performing outer periphery welding to connect a plurality of cylindrical parts 1 ′, 1 ″, 1 ′ ″, etc. after incorporating the parts inside, Spatter generated during welding may remain on the surface of the cylindrical part 1. In the case of spatter in which molten metal is scattered, it is difficult to clean, unlike mere dust, because it adheres to the surface to some extent. In particular, in the case of precision parts, when the cylindrical part 1 integrated by welding is incorporated into another fitting part and used, the spatter on the surface of the cylindrical part 1 may cause a serious problem if it is peeled off after use. Therefore, detection of spatter was indispensable. In the case where a plurality of cylindrical parts are integrated by performing outer periphery welding, it is essential to detect spatter as well.

One embodiment of the present invention relates to a sputter detection apparatus that detects spatter generated when welding a plurality of cylindrical or columnar parts, and will be described in detail below.
FIG. 1 is a schematic diagram illustrating one embodiment of the present invention. FIG. 2 is a front view of an embodiment of the present invention.

  The inspection target in the present embodiment is the cylindrical part 1 that has been subjected to the outer periphery welding in order to connect the plurality of cylindrical parts 1 ′, 1 ″, 1 ″ ″. In this embodiment, in order to inspect whether spatter has adhered to the outer peripheral surface of the cylindrical part 1, the cylindrical part 1 is held by a center hole method. Plugs 2 and 3 having a center hole are fitted into the cylindrical part 1 and are held from both ends by a center 13. Although a plurality of cylindrical parts 1 ′, 1 ″, 1 ′ ″ that are welded are joined to be coaxial, strictly speaking, each cylindrical part 1 ′, 1 ″, 1 ′ is joined. The axis of '' is slightly shifted. In the present embodiment, the presence of spatter is accurately detected in response to such an axis deviation.

  Center holes on both end faces of the cylindrical part 1 are held by the center 13 and are pivotally supported so as to be able to rotate. In the driving hole 4 provided on the plug 2 on one side of the cylindrical part 1, The protrusion is inserted, and the cylindrical part 1 is driven and rotated by a motor 40 (not shown). A configuration in which the cylindrical part 1 is held by the center 13 and driven and rotated by the motor 40 is referred to as a rotation holding unit.

  In the present embodiment, measuring rollers 10, 10, 10 are installed via springs 12 corresponding to the plurality of cylindrical parts 1 ′, 1 ″, 1 ″ ″. The measurement roller support member 14 that supports the measurement roller 10 is configured to slide in the linear direction in the radial direction of the cylindrical part 1 so that the movement amount of the measurement roller can be detected by the gap sensor 11. . Even if the axis of each cylindrical part 1 ′, 1 ″, 1 ′ ″ is slightly deviated, the measuring roller 10 can be suspended independently and the amount of movement can be detected. Presence can be accurately detected.

The measuring roller 10 is made into a shape that can be in close contact with the shape of the outer periphery of the cylindrical part 1 and is a highly accurate part with extremely small runout. For example, if the shape of the cylindrical part 1 is a tapered portion, the measuring roller 10 is also inversely tapered with the same inclination. As shown in FIG. 1, it is necessary to provide a diameter difference in the measurement roller so that the measurement roller 1 can be in close contact with a step on the outer periphery of the cylindrical part 1. The more the surface shape of the measuring roller 10 is matched with the outer peripheral shape of the cylindrical part 1, the more accurately the spatter can be detected.
Since the movement of the measurement roller support member 14 that supports the measurement roller 10 greatly affects the accuracy of the detection amount, the linear motion guide (LM) that guides the movement of the measurement roller bearing and the measurement roller support member 14 is supported. Guides 15 and 16 (see FIG. 2) are high-precision parts.

  FIG. 2 shows the schematic diagram of FIG. 1 as a more specific configuration. The measuring roller 10 rotates as the cylindrical part 1 rotates. A proximity sensor is installed on the measurement roller support bracket 21 in order to detect whether or not the measurement roller 10 is rotating. This is because if the measuring roller is not rotating, it will be reduced, so this must be avoided. It is desirable that the diameter of the measuring roller 10 be as small as possible. This is because the unevenness of the spatter can be quickly followed.

  The measurement roller support bracket 21 is fixed to the measurement roller support member 14, and further provided with a stop bar 20 and a stopper 19 for setting the advance position of the measurement roller support member 14. The measuring roller support member 14 is moved in a linear direction by a guide 16 constituting a linear motion guide portion and a slide support base 15 having a substantially U-shaped cross section.

  The outer frame 18 is fixed to the bed 30. As shown in FIG. 2, the detection surface of the gap sensor 11 for detecting the gap distance is fixed at an arbitrary position on the opposing surface of the rods 22 and 23 protruding between the outer frame 18 and the measuring roller support member 14. Yes. Further, a spring 12 is provided between the outer frame 18 and the measurement roller support member 14 and is urged so that the measurement roller 10 is pressed against the cylindrical part 1. Reference numeral 17 denotes a cylinder operating rod for retracting the measuring roller 10 by a predetermined amount when the cylindrical part 1 is set.

Below, the detection discrimination | determination part of presence of a sputter | spatter is demonstrated.
Center holes on both end faces of the cylindrical part 1 are pivotally supported by the center 13, and the cylindrical part 1 is rotated by driving a motor 40 on one side of the cylindrical part 1. Next, the actuating rod 17 is actuated so that the measuring roller 10 is rotated along with the rotation of the cylindrical part 1, so that several measuring rollers 10 are connected to the respective parts 1 of the welded cylindrical part 1. “1 ″, 1 ′ ″ is pressed against and brought into contact with a spring, and detection of the gap sensor 11 is started.

3A and 3B are measurement diagrams showing an example of a detection waveform of the gap sensor, where FIG. 3A shows a waveform without sputtering and FIG. 3B shows a waveform with sputtering.
In the case of the normal spatter-free cylindrical part 1, the waveform of the gap sensor 11 during the rotation of the cylindrical part changes smoothly. However, if foreign matter such as spatter is on the outer periphery, the measuring roller moves rapidly up and down. To do. By differentiating the captured waveform so that the amount of movement can be measured, the amount of movement per unit time of the measuring roller 10 can be detected. As shown in FIG. 3B, a threshold value is set according to the size of the foreign matter so that only a sudden moving component can be extracted, and the excess value can be determined as NG.

The operation of this embodiment is as follows.
First, the welded cylindrical part 1 (work) is set in the center 13. Next, each measuring roller 10 is advanced and brought into contact with the cylindrical part 1. The motor 40 is driven, the cylindrical part 1 is rotated at an arbitrary rotational speed, and measurement is started. The waveform detected by the gap sensor 11 is taken in, subjected to differentiation processing, and compared with the threshold value a set for determination. After completion of the determination, the measuring roller 10 is retracted and the cylindrical part 1 is taken out. In this case, if there is even one spatter, the threshold value a is exceeded, so it is determined as a defective product (NG).
As seen in FIG. 3, the waveform of the raw waveform fluctuates in a trigonometric function. This has a slight shift in the axial center of the cylindrical part 1 and fluctuates periodically. Even in such a case, since the differential processing is performed, it is possible to detect a sudden displacement due to the presence of spatter by removing the periodic fluctuation.

As another embodiment of the present invention, the following modifications can be considered.
In the one embodiment, if there is even one spatter, it is determined as NG. On the other hand, in another embodiment of the present invention, it is also possible to count a pulse-like waveform in one cycle in the differential processing waveform. That is, in the differential processing waveform, it is first determined whether or not the threshold value a is exceeded, and if it exceeds, the number of pulses exceeding the threshold value a is counted in one cycle to determine whether or not it is less than a predetermined number n. If it is greater than or equal to the predetermined number n, it is determined as NG.

In the above-described embodiment, the rotation holding unit is pivotally supported so that the center hole on both end faces of the cylindrical part 1 is held by the center 13 and can be rotated. On the other hand, as a rotation holding part, you may hold | maintain the both end surfaces of the cylindrical component 1 with an outer diameter or an internal diameter collet chuck. In any case, the cylindrical part 1 does not have to be completely centered and pivotally supported. This is because the raw waveform is subjected to differential processing even if it periodically fluctuates due to axial misalignment, so that abrupt displacement due to the presence of spatter can be detected by removing the cyclic fluctuation.
An automation device such as a robot hand when the rotation holding unit holds the center holes of both end faces of the cylindrical part 1 at the center 13 or holds both end faces of the cylindrical part 1 with an outer diameter or inner diameter collet chuck. May be used to automatically supply and discharge the cylindrical part 1.

In the above-described embodiment, the measurement rollers 10, 10, 10 are installed via the springs 12 in correspondence with the plurality of cylindrical parts 1 ′, 1 ″, 1 ′ ″. On the other hand, it is possible to detect at least one measuring roller 10 so as to be movable across both ends of the cylindrical part 1 and to detect spatter as in the above embodiment.
In the above embodiment, the case where the outer peripheral welding is performed to connect the plurality of cylindrical parts 1 ′, 1 ″, 1 ′ ″ and the like to form the integrated cylindrical part 1 is mainly performed. As described above, spatter can be detected in exactly the same manner even when the inspection target is a case where a plurality of cylindrical parts are integrated by welding.

  In the above embodiment, the measuring roller support member 14 is configured to move in the linear direction by the guide 16 constituting the linear motion guide portion and the slide support base 15 having a substantially U-shaped cross section. On the other hand, the measurement roller support member 14 may be fixed, and the measurement roller 10 may be held by the bearing portion so that the bearing portion can move within the measurement roller support member 14. In this case, the gap sensor 11 is installed between the bearing portion and the measurement roller support member 14 to detect the movement amount of the measurement roller 10.

1 part 10 measuring roller 11 gap sensor 12 spring 14 measuring roller support member 30 bed

Claims (4)

A spatter detection device for detecting spatter and the like adhering to the surface of a part (1) integrated by welding a plurality of cylindrical or cylindrical parts,
The sputter detection device comprises at least one measuring roller (10),
A measurement roller support member (14) for supporting the measurement roller (10);
A gap sensor (11) for detecting the amount of movement of the measuring roller (10) in the radial direction of the component (1);
In the sputter detection apparatus comprising a rotation holding unit that rotatably holds the component (1) and that rotationally drives the component (1).
A sputter detection apparatus for differentiating a waveform obtained from the gap sensor (11) and comparing the waveform with a predetermined threshold (a) to determine the presence of spatter.   The sputter detection apparatus according to claim 1, wherein the measuring roller (10) is installed at a position corresponding to the plurality of welded cylindrical or columnar parts.   The measurement roller support member (14) slides on the bed (30) with a linear guide, and the gap sensor (11) moves the measurement roller support member (14) with respect to the bed (30). The sputter detection apparatus according to claim 1, wherein the sputter detection apparatus is installed so as to detect the turbulence.   Differentiating the waveform obtained from the gap sensor (11), counting the number of times that exceeded a predetermined threshold (a) in one cycle, and determining whether the component (1) is less than the predetermined number (n) The sputter detection apparatus according to any one of claims 1 to 3, wherein the quality is determined.

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