JP6986964B2 - Welding sensor device - Google Patents

Description

The present invention relates to a welding sensor device suitable for welding a workpiece.

Conventionally, when welding such as butt welding to a pair of iron plates or the like having a groove shape by arc welding or the like, the welding torch is brought closer to the work (the portion having the butt groove shape). In this state, by applying a voltage between the tip of the welding wire sent from the welding torch and the work, an arc is generated between them. As a result, the welding wire melts and the works are heated and melted, so that the works can be welded to each other.

When welding, the distance between the welding torch and the work, or the shape of the work, affects the welding quality of the work. From this point of view, for example, Patent Document 1 proposes a welding sensor device for measuring the shape of a work.

The welding sensor device shown in Patent Document 1 includes a light projecting unit that emits laser light and a detection unit that detects laser light reflected from the surface of the work, and the shape of the work is obtained from the detected laser light. Is being measured. The light projecting unit and the detection unit are housed in a storage case (containment unit) composed of a housing (case body) and a protective cover. The protective cover is formed with a shielding portion that shields spatter from the work generated during welding.

Japanese Unexamined Patent Publication No. 2004-195502

Here, according to the welding sensor device of Patent Document 1, since the radiant heat from the welded portion toward the accommodating portion in which the sensor unit is accommodated can be shielded by the shielding portion, the heating of the sensor unit caused by the radiant heat can be shielded. Can be reduced.

However, for example, when welding is continuously performed for a long time, radiant heat from the welded portion may be continuously input to the shielding portion. In addition to this, for example, when welding members to be welded having a thicker plate than before, the energy input to the welded portion may be set higher than before. In these cases, the energy of the radiant heat input from the welded portion to the shield portion becomes larger than before, and as a result, the heat of the shield portion is transferred to the accommodating portion, and the sensor unit is heated more than expected. Sometimes.

The present invention has been made in view of these points, and is for welding, which can reduce the conduction of radiant heat from the work toward the sensor unit from the shielding portion to the accommodating portion accommodating the sensor unit during welding. The purpose is to provide a sensor device.

In view of the above problems, the welding sensor device according to the present invention includes a sensor unit that measures the state of the workpiece to be welded or the distance to the workpiece, an accommodating portion that accommodates the sensor unit, and when the workpiece is welded. A welding sensor device including at least an accommodating body having a shielding portion that shields radiant heat toward the accommodating portion among the generated radiant heat, and the surface on the side to which the work is welded is the surface. When the front surface of the shielding portion is used and the opposite side thereof is the back surface, the heat dissipation area of the back surface of the shielding portion is larger than the heat dissipation area of the front surface.

According to the present invention, when the accommodating body of the welding sensor device includes the shielding portion, the radiant heat toward the accommodating portion among the radiant heat generated at the time of welding the work can be shielded by the shielding portion. As a result, it is possible to prevent the sensor unit accommodated in the accommodating portion from being heated by the radiant heat.

Further, in the present invention, since the heat dissipation area of the back surface of the shielding portion is larger than the heat dissipation area of the front surface, the heat input to the shielding portion is opposite to the side where the work is welded from the shielding portion. Heat is dissipated to the side. As a result, it is possible to prevent the heat input by the radiant heat from being transferred to the sensor unit housed in the housing unit. Here, the "heat dissipation area of the back side surface (front side surface)" in the present invention is the area of the surface on the back side (front side) where the shielding portion is substantially exposed.

Here, if the heat dissipation area of the back surface of the shielding portion is larger than the heat dissipation area of the front surface, the shape of the back surface is not particularly limited, but in a more preferable embodiment, the back surface has a plurality of concave portions or protrusions. The part is formed. According to this aspect, since a plurality of concave portions or convex portions are formed on the back surface, heat can be efficiently dissipated from the side wall surface forming the concave portions or convex portions.

Further, as another preferred embodiment, the shielding portion includes a plate-shaped member forming the front surface of the shielding portion and a net-like member laminated on the plate-shaped member to form a part of the back surface of the shielding portion. And prepare.

According to this aspect, by laminating the network members, the surface of the portion exposed from the network member and the wire constituting the network member on the back surface of the plate-like member are formed by the wires constituting the network member. The surface can increase the heat dissipation area of the back surface of the shielding portion. Further, in this aspect, by preparing a net-like member and arranging it on the plate-like member, it is possible to obtain a shielding portion having a back surface having a large heat dissipation area.

Further, such a net-like member may be either one made of one net material or one made of a stack of a plurality of net materials. However, in a more preferable embodiment, the mesh member has a structure in which a plurality of mesh materials are laminated along the thickness direction, and the size of the mesh of the mesh material located on the back side of the shielding portion is the shielding. It is larger than the mesh size of the mesh material located on the front side of the part.

According to this aspect, in each net material, the mesh size of the mesh material located on the back side of the shielding portion is larger than the mesh size of the mesh material located on the front side of the shielding portion, so that the mesh member is a fractal. The structure is close to the structure. Therefore, the heat input from the front surface of the shielding portion is easily dissipated to the back side as compared with the case where the net material having the same structure is laminated. In addition, "the size of the mesh of the mesh material located on the back side of the shielding portion is larger than the mesh size of the mesh material located on the front side of the shielding portion" means, for example, that the strands of the mesh material are oriented. If so, it means that "the spacing between the mesh wires located on the back side of the shielding portion is larger than the spacing between the meshing wires located on the front side of the shielding portion".

More preferably, the net material is a member in which a metal wire is woven. According to this aspect, the net material in which the metal strands are woven has a regular structure in which the strands are arranged at equal pitches, so that the structure is closer to the fractal structure and the heat dissipation is enhanced. Can be done.

In a more preferable embodiment, the shielding portion is a porous body made of a metal material or a ceramic material, the shielding portion is formed of a plurality of layers, and the porosity of the layer formed on the back side is the front side. Higher than the porosity of the layer formed in. According to this aspect, in each layer, the porosity of the back side layer is higher than the porosity of the front side layer, so that the substantial surface area of the back side surface of the shielding portion is large. Therefore, the heat input to the shielding portion can be positively dissipated from the shielding portion to the side opposite to the side where the work is welded.

According to the present invention, it is possible to reduce the conduction of radiant heat from the work toward the sensor unit during welding from the shielding portion to the accommodating portion accommodating the sensor unit.

It is a schematic side view of the welding sensor device in the state attached to the welding device which concerns on 1st Embodiment of this invention. FIG. 3 is a schematic perspective view of the welding sensor device shown in FIG. 1 as viewed from one side. FIG. 3 is a schematic perspective view of the welding sensor device shown in FIG. 1 as viewed from the other side. It is a schematic side view of the welding sensor device shown in FIG. 1. It is a schematic disassembled perspective view of the shielding member of the welding sensor device shown in FIG. 2 and the protective cover. It is a schematic perspective view which looked at the shielding member shown in FIG. 1 from the other side. It is a schematic perspective view of the shielding member which concerns on the modification of 1st Embodiment. It is a schematic perspective view of the shielding member which concerns on the modification of 1st Embodiment. It is a schematic perspective view of the shielding member which concerns on the modification of 1st Embodiment. It is a schematic perspective view which looked at the shielding member which concerns on 2nd Embodiment from the other side. It is a schematic disassembled perspective view of the shielding member which concerns on 2nd Embodiment. It is a schematic disassembled perspective view of the shielding member which concerns on the modification of 2nd Embodiment. (A) is a schematic disassembled perspective view of the shielding member according to the modified example of the third embodiment, and (b) is a cross-sectional view of the shielding member shown in (a).

Hereinafter, the welding sensor device (hereinafter referred to as a sensor device) according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 13.

<First Embodiment>
The sensor device 1 according to the first embodiment will be described below with reference to FIGS. 1 to 6.
1. 1. About the mounting state of the sensor device 1 and the overall configuration of the sensor device 1 As shown in FIG. 1, the sensor device 1 according to the present embodiment is mounted on the welding device 9 via a mounting jig 8. A welding wire 93 is supplied to the welding torch 91 of the welding apparatus 9, and at the time of welding, a voltage is applied between the tip of the welding wire 93 sent from the welding torch 91 and the work W. , An arc A is generated between them. As a result, the welding wire 93 is melted, and a molten pool P is generated in the work W, so that the work W can be welded. While forming the molten pool P in the work W, the welding device 9 moves in the direction of the arrow shown in FIG. 1 to form a welded portion (bead) B between the works W. In FIG. 1, the work W is drawn as one work for convenience, but butt welding, fillet welding, lap welding, etc. are performed on two or more works, and the welding method is particularly limited. Not limited. Further, in the present embodiment, welding between workpieces is specified as arc welding using a welding wire, but in addition to this, for example, TIG welding, electron beam welding, laser beam welding, gas welding and the like. It may be welding.

In order to perform stable welding on the work W by the welding device 9, it is important to measure the distance between the welding torch 91 and the work W or the shape of the work W. Therefore, in the present embodiment, as an example thereof, the sensor device 1 measures the shape with the work W or the distance to the work W.

As shown in FIG. 1, the sensor device (sensor head) 1 according to the present embodiment includes a sensor unit 2 and an accommodating body 3A accommodating the sensor unit 2. In the present embodiment, the accommodating body 3A includes an accommodating case (accommodating portion) 3 provided with a protective cover 40, and a shielding member (shielding portion) 5 attached to the accommodating case 3. In the present embodiment, the accommodation case 3 and the shielding member 5 are separable members, but they may have an integrated structure. It should be noted that these configurations are the same for the welding apparatus according to the second and third embodiments described later.

2. 2. About the sensor unit 2 The sensor unit 2 is a device for measuring the shape of the work W or the distance (from the sensor unit 2) to the work W by the detected laser light (detection light) L2. In the present embodiment, as an example, the sensor unit 2 has a light projecting unit 21 that projects laser light L1 onto the surface of the work W to be welded, and a detection unit 22 that detects laser light L2 reflected from the surface of the work. And have. The light projecting unit 21 includes a laser light source 21b that generates laser light, and a light projecting device (optical system) 21a that projects (projects) the laser light L1 generated from the laser light source 21b onto the work W. ..

The detection unit 22 is a light receiving device (optical system) 22a in which the laser light L1 projected from the light projecting device 21a receives the laser light L2 reflected from the surface of the work W, and the laser light transmitted from the light receiving device 22a. It is provided with a detection device 22b for detecting L2. The light receiving device 22a sends the laser light L2 received to the detection device 22b, and the detection device 22b is, for example, an image pickup device (camera), detects the laser light L2, and outputs the data of the detected laser light L2 to the outside of the sensor device. Alternatively, it is transmitted to an image processing device (not shown) inside the sensor device. In the image processing apparatus, the shape (state) of the work W or the distance from the sensor unit 2 (specifically, the laser light source 21b) to the work W is measured. For example, from the measured distance, the welding torch 91 and the work W Distance is converted.

In the present embodiment, as an example of the sensor unit, the sensor unit 2 provided with the light projecting unit 21 and the detection unit 22 is shown. For example, the light projecting unit is used as a separate unit, and this is used as a welding sensor device 1. The light projecting unit 21 of the sensor unit 2 may be omitted by providing it outside the sensor unit 2.

Further, in the present embodiment, the sensor unit 2 uses the laser beams L1 and L2 to measure the state (shape) of the work W or the distance from the detection unit 22 to the work W. For example, the laser beam is used. Instead, the light generated from the work W, for example, the molten pool P at the time of welding, or the light reflected on the work W from an external light source or the like may be detected as the detection light. Also in this case, the light projecting unit 21 of the sensor unit 2 shown in the present embodiment is omitted, and the detection unit is a light receiving device (optical system) that receives the detection light toward the surface of the work W and sends the detection unit from the light receiving device. It suffices to include at least an image pickup device (camera) for detecting the detected light. Since the welding sensor device 1 does not have the light projecting unit 21, each part for light projecting can be omitted. The detected detection light data is transmitted to an image processing device (not shown) outside the sensor device or inside the sensor device, and the state of the work W (for example, the melting state of the molten pool P) can be measured. From the measured state of the work W, the voltage applied between the tip of the welding wire 93 sent from the welding torch 91 at the time of welding and the work W may be controlled. In addition, the sensor unit may measure the state of the work W to be welded or the distance to the work W by using ultrasonic waves or electromagnetic waves. It should be noted that these configurations are the same for the welding apparatus according to the second and third embodiments described later.

3. 3. Containment Case 3 As shown in FIGS. 1 and 4, the accommodation case 3 accommodates the sensor unit 2 and allows the laser light L1 emitted from the light projecting unit 21 and the laser light L2 toward the detection unit 22 to pass through. It is configured. As long as the laser light L1 and L2 can be transmitted, for example, it may be in an opened state, and a material (for example, transparent resin or glass) through which the laser light L1 and L2 can pass through the opened portion may be used. ) May be covered. In the present embodiment, the storage case 3 includes a case main body 30 and a protective cover 40.

3-1. About the case main body 30 In the present embodiment, the case main body 30 is an assembly for accommodating the sensor unit 2. As shown in FIGS. 2 and 3, the case body 30 has covers 32a and 32b on both sides of a housing 31 having recesses (not shown) for accommodating the sensor unit 2 via fasteners 71 such as screws. It is covered. In FIGS. 2 to 4, of the surfaces of the sensor device 1, the surface on the side where the welding device 9 is arranged is represented as the front surface 30a, and the opposite side thereof is represented as the back surface 30b.

As shown in FIG. 4, the case body 30 is formed with a first gas flow path 35 for purging that communicates with the protective cover 40. Examples of the gas supplied to the first gas flow path 35 include air (atmosphere), helium gas, argon gas, nitrogen gas, carbon dioxide gas, and a gas obtained by mixing these gases. Here, during welding, purge air can be discharged from the first and second discharge ports 42, 43 described later of the sensor device 1 to cool the sensor device 1, and a gas chemically stable with respect to the welded portion of the work W. For example, gas from a source of shield gas for welding (not shown) may be used.

On the upper surface of the case body 30, a connection terminal 37a for outputting a detection signal from the sensor unit 2, power supply to the sensor unit 2, and input of a control signal to the sensor unit 2 are performed. Connection terminal 37b is provided. Further, on the upper surface of the case main body 30, a gas supply port 37e for supplying gas to the protective cover 40 via the first gas flow path 35 is provided. In addition to this, a lamp 37d for displaying the ON / OFF status of the power supply of the sensor unit 2 is provided.

3-2. About the protective cover 40 As shown in FIGS. 2 to 4, the protective cover 40 constitutes a part of the storage case 3. The protective cover 40 is made of, for example, a metal material or a resin material, and is attached from the bottom surface side of the case body 30 by a fastener 74 such as a screw. By attaching the protective cover 40 to the case body 30, a second gas flow path 45 communicating with the first gas flow path 35 is formed, and the second gas flow path 45 has a first discharge port 42 and a second gas flow path 45. 2 Discharge port 43 is formed.

The first discharge port 42 is formed at a position where the gas from the second gas flow path 45 is discharged and the laser light L1 projected from the light projecting device 21a passes through. A second discharge port 43 is further formed downstream of the first discharge port 42, and the second discharge port 43 discharges gas from the second gas flow path 45 and emits light from the light receiving device 22a. It is formed at a position where the laser beam L2 passes through. The second discharge port 43 is formed so that the released gas is sprayed on the back surface 50b of the shielding member 5, which will be described later. This makes it possible to improve the heat dissipation of the shielding member 5.

Further, as shown in FIG. 5, the protective cover 40 is formed with a first mounting portion 47 for mounting the shielding member 5, which will be described later, and the first mounting portion 47 is provided with a shaft (mounting tool) 73. A through hole 47a to be inserted is formed. Further, the first mounting portion 47 is formed with a mounting surface 47b for mounting the shielding member 5 on the protective cover 40 at an appropriate angle with respect to the laser beams L1, L2 and the like.

4. About the shielding member 5 As shown in FIGS. 1 to 4, the shielding member 5 constituting the sensor device 1 is located on the lower side (specifically, the first and 1st) of the accommodation case 3 among the radiant heat generated during welding of the work W. The radiant heat H toward the second discharge port 42, 43) is shielded. The shielding member 5 scatters from the molten pool P and shields the spatter S toward the lower surface of the accommodating case 3. The shielding member 5 includes a plate-shaped main body 51 extending from the storage case 3 toward the work W side.

Here, as shown in FIGS. 5 and 6, when the side to which the work W is welded is the front side of the shielding member 5 and the opposite side is the back side, the back side surface 50b of the shielding member 5 has a protective cover. A pair of second mounting portions 57, 57 for mounting on the 40 are formed. With the shielding member 5 attached to the protective cover 40, the first attachment portion 47 of the protective cover 40 is arranged between the two second attachment portions 57, 57 of the shielding member 5.

The second mounting portion 57 is formed with a through hole 57a through which the shaft 73 is inserted. Here, with the first mounting portion 47 arranged between the two second mounting portions 57, 57 and the shielding member 5 installed on the mounting surface 47b, the through hole 47a of the first mounting portion 47 , The through hole 57a of the second mounting portion 57 is connected to form one through hole. As a result, the shaft 73 can be inserted into the through hole 47a of the first mounting portion 47 and the through hole 57a of the second mounting portion 57 from the width direction (lateral direction) of the shielding member 5. As a result, the shielding member 5 can be attached to the protective cover 40 by sandwiching it between the head 73c of the shaft 73 and the head 73d of the screw body 73b.

In the present embodiment, the shielding member 5 is made of a resin material, a metal material, or a ceramic material, preferably made of a material having a heat resistant temperature (at least a melting point) of 700 ° C. or higher, and is mechanical even at 700 ° C. or higher. A material whose strength does not easily decrease is more preferable.

For example, as the resin material, for example, a thermosetting resin is preferable, and examples thereof include an epoxy resin, a phenol resin, an unsaturated polyester resin, and a polyimide resin. Examples of the metal material include cast iron, steel, aluminum, copper, brass, and the like. Examples of the ceramic material include alumina, ittria, silicon carbide, silicon nitride, zirconia, cozilite, cermet, stetite, mulite, aluminum nitride, and sapphire.

As shown in FIG. 6, in the present embodiment, when the surface on the side where the work W is welded is the front surface 50a of the shielding member 5 and the opposite side is the back surface 50b, the back surface 50b of the shielding member 5 is used. The heat dissipation area of is larger than the heat dissipation area of the front surface 50a. Specifically, on the back side surface 50b, a plurality (specifically, 6 pieces) are provided along the direction in which the shielding member 5 extends from the base end on the storage case 3 side to which the shielding member 5 is attached. The ridge 52 is formed.

In the present embodiment, the housing body 3A of the sensor device 1 is provided with the shielding member 5, so that the radiant heat toward the housing case 3 among the radiant heat generated at the time of welding the work W can be shielded by the shielding member 5. .. As a result, it is possible to prevent the sensor unit 2 housed in the housing case 3 from being heated by the radiant heat. In particular, when the shielding member 5 is made of a ceramic material, the heat resistance of the shielding member 5 can be ensured.

Further, in the present embodiment, the heat radiation area of the back surface 50b of the shielding member 5 is larger than the heat radiation area of the front surface 50a by providing the protrusion 52 of the back surface 50b. That is, since the back surface 50b has a substantially larger surface area than the front surface 50a, the heat input to the shielding member 5 is transferred from the shielding member 5 to the side opposite to the side to which the work W is welded. Heat is dissipated. The released heat is endothermic using the gas released from the first discharge port 42 and the second discharge port 43 as a cooling medium. In this way, it is possible to prevent the heat input by the radiant heat from being transmitted to the sensor unit 2 housed in the housing case 3.

Such a shielding member 5 may be manufactured, for example, by machining from a bulk material of the above-mentioned material, or may be molded by injection, for example, when the material is a resin material. When the material of the shielding member 5 is a metal material or a ceramic material, it can be manufactured by sintering these powders.

In the above-described embodiment, a plurality of protrusions 52 are formed on the back surface 50b of the shielding member 5, but for example, as shown in FIG. 7, a plurality of protrusions 52A may be formed on the back surface 50b of the shielding member 5. good. In this case, since the heat dissipation area of the back surface 50b of the shielding member 5 can be made larger than that in the case of FIG. 6, more heat input to the shielding member 5 is transferred from the shielding member 5. Heat can be dissipated to the side opposite to the side where the work is welded.

Further, as shown in FIG. 8, a plurality of recesses are formed on the back surface 50b of the shielding member 5 along the direction in which the shielding member 5 extends from the base end on the accommodation case 3 side to which the shielding member 5 is attached. A groove 53 may be formed. Even in this case, by providing the concave groove 53, the heat dissipation area of the back side surface 50b of the shielding member 5 can be made larger than the heat dissipation area of the front side surface 50a. As a result, the heat input to the shielding member 5 can be positively radiated from the shielding member 5 to the side opposite to the side where the work W is welded. Further, as shown in FIG. 9, a plurality of recesses 53A may be provided on the back surface 50b of the shielding member 5.

<Second Embodiment>
The sensor device 1 according to the second embodiment will be described below with reference to FIGS. 10 to 12. In the second embodiment, only the structure of the shielding member 5 is different from that of the first embodiment. Therefore, the other configurations are designated by the same reference numerals and detailed description thereof will be omitted.

As shown in FIGS. 10 and 11, in the present embodiment, the shielding member 5 is laminated on the plate-shaped member 50 forming the front surface 50a of the shielding member 5 and the plate-shaped member 50, and the back surface of the shielding member 5 is laminated. A mesh member 54 forming a part of 50b is provided. The plate-shaped member 50 corresponds to the shielding member 5 shown in the first embodiment, and the difference from the shielding member 5 of the first embodiment is that the back surface 50b has a flat surface without ridges or the like. Is.

The net-like member 54 is a member woven by a plurality of strands 54a, and is oriented at equal intervals so that the strands 54a intersect (specifically, orthogonally). In the present embodiment, the wire 54a is made of a metal material, and examples of the metal material include steel materials such as stainless steel, aluminum, brass, and copper. The net-like member 54 is laminated on the plate-like member 50 with an adhesive or the like, and the laminating method is not particularly limited as long as these can be fixed. Further, although the net-like member 54 is a plain weave woven with a metal wire, fibers oriented in directions intersecting with each other may be attached by adhesion or the like.

According to the present embodiment, of the back surface of the plate-shaped member 50, the surface of the portion exposed from the mesh member 54 and the surface of the wire 54a constituting the mesh member 54 dissipate heat from the back surface 50b of the shielding member 5. The area can be increased. Further, by preparing the net-like member 54 and arranging it on the plate-like member 50, it is possible to obtain the shielding member 5 having the back side surface 50b having a large heat dissipation area.

Further, as shown in FIG. 12, the net-like member 54 may have a structure in which a plurality of net materials 54A, 54B, 54C are laminated. In the present embodiment, the net materials 54A, 54B, and 54C are woven with the above-mentioned metal strands having the same diameter, and in the present embodiment, they are woven with a plain weave, for example, twill weave or satin weave. It may be woven or the like.

In the present embodiment, the mesh size of the mesh material 54A located on the back side (50b side) of the shielding member 5 is larger than the mesh size of the mesh materials 54B and 54C located on the front side (50a side) of the shielding member 5. big. Further, the mesh size of the mesh material 54B located on the back side (50b side) of the shielding member 5 is larger than the mesh size of the mesh material 54C located on the front side (50a side) of the shielding member 5.

Here, in the present embodiment, the mesh size is the size of the space (internal region) surrounded by the strands 54a. For example, in the case of the mesh material 54A, the vertically adjacent strands 54a and 54a are exemplified. Refers to the size of the internal region formed by the strands 54a and 54a adjacent to each other in the lateral direction. That is, in the present embodiment, the distance between the strands of the net material 54A located on the back side (50b side) of the shielding member 5 is larger than the distance between the net materials 54B and 54C located on the front side (50a side) of the shielding member 5. big.

According to this aspect, the mesh size of the mesh material 54A located on the back side of the shielding member 5 is larger than the mesh size of the mesh materials 54B and 54C located on the front side of the shielding member 5. The mesh size of the mesh material 54B located on the back side of the shielding member 5 is larger than the mesh size of the mesh material 54C located on the front side of the shielding member 5. With such a structure, the net-like member 54 has a structure close to that of a fractal structure.

Therefore, the heat input from the front surface 50a of the shielding member 5 is easily dissipated to the back surface side as compared with the case where the net material having the same structure is laminated. The mesh materials 54A, 54B, and 54C in which the metal strands 54a are woven have a regular structure in which the strands 54a are arranged at equal pitches, so that the structure is closer to a fractal structure and heat dissipation is enhanced. be able to.

<Third Embodiment>
The sensor device 1 according to the third embodiment will be described below with reference to FIG. In the third embodiment, only the structure of the shielding member 5 is different from that of the first embodiment. Therefore, the other configurations are designated by the same reference numerals and detailed description thereof will be omitted.

The shielding member 5 according to the present embodiment is made of the above-mentioned metal material or ceramic material. The shielding member 5 is a porous body, and the back surface 50b is made of a flat surface without ridges or the like with respect to the shielding member 5 shown in the first embodiment. The plate-shaped main body 51 of the shielding member 5 has a three-layer structure of a front surface layer 51a, an intermediate layer 51b, and a back surface layer 51c, and the porosities of these are different.

Specifically, the porosity of the back surface layer 51c formed on the back side is higher than the porosity of the intermediate layer 51b and the front surface layer 51a formed on the front side. Further, the porosity of the intermediate layer 51b formed on the back side is higher than the porosity of the surface layer 51a formed on the front side. With this configuration, the substantial surface area of the back surface 50b of the shielding member 5 can be increased. As a result, the heat input to the shielding member 5 can be positively dissipated from the shielding member 5 to the side opposite to the side where the work W is welded.

In such a shielding member 5, a kneaded material obtained by kneading a powder made of a metal material or a ceramic material with a volatile agent having volatile properties at the time of sintering is laminated so that the porosity is different, and the kneaded material is sintered. Obtainable. Further, plate materials having different porosities may be prepared and their peripheral edges may be bonded together. The porosity can be calculated by subtracting the density of each layer from the density of the material itself.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs are designed without departing from the spirit of the present invention described in the claims. You can make changes.

For example, in the modified example of the second embodiment, three net materials are laminated, but for example, two or four or more of these may be laminated, and in the third embodiment, the shielding member 5 has a three-layer structure. However, for example, it may have a two-layer or four-layer structure.

In the present embodiment, the sensor unit projects laser light onto the work, receives the laser light reflected from the work as detection light, and measures the state (shape) of the work and the distance from the detection unit to the work. For example, the sensor unit may capture the light reflected from the work or the light emitted from the work at the time of welding as detection light by an image pickup device (camera) to detect the welding state of the work.

1: (For welding) sensor device 2: Sensor unit, 21: Floodlight part, 22: Detection part, 3A: Containment body 3: Containment case, 30: Case body, 35: First gas flow path, 40: Protective cover, 42: 1st discharge port, 43: 2nd discharge port, 45: 2nd gas flow path, 47: 2nd mounting part, 47a: through hole, 47b: installation surface, 5: shielding member, 50: plate Shaped member, 50a: front surface layer, 50b: intermediate layer, 50c: back surface layer, 51: plate-shaped main body, 52: convex strip, 52A: protrusion, 53: concave groove, 53A: concave portion, 54: net-like member, 54a: element Wire, 54A to 54C: Net material, L1, L2: Laser light, W: Work

Claims (5)

A sensor unit that measures the state of the workpiece to be welded or the distance to the workpiece,
An accommodating body having an accommodating portion for accommodating the sensor unit and a shielding portion for shielding the radiant heat toward the accommodating portion among the radiant heat generated during welding of the work.
It is a welding sensor device equipped with at least
When the surface on the side where the work is welded is the front surface of the shielding portion and the opposite side is the back surface,
The heat dissipation area of the back surface of the shielding portion is larger than the heat dissipation area of the front surface .
A welding sensor device characterized in that a plurality of concave portions or convex portions are formed on the back surface. A sensor unit that measures the state of the workpiece to be welded or the distance to the workpiece,
An accommodating body having an accommodating portion for accommodating the sensor unit and a shielding portion for shielding the radiant heat toward the accommodating portion among the radiant heat generated during welding of the work.
It is a welding sensor device equipped with at least
When the surface on the side where the work is welded is the front surface of the shielding portion and the opposite side is the back surface,
The heat dissipation area of the back surface of the shielding portion is larger than the heat dissipation area of the front surface .
The shielding portion includes a plate-shaped member forming the front surface of the shielding portion and
A welding sensor device comprising: a net-like member laminated on the plate-like member and forming a part of the back surface of the shielding portion. The net-like member has a structure in which a plurality of net materials are laminated along the thickness direction.
The welding sensor device according to claim 2 , wherein the mesh size of the mesh material located on the back side of the shielding portion is larger than the mesh size of the mesh material located on the front side of the shielding portion. The welding sensor device according to claim 3 , wherein the net material is a member in which a metal wire is woven. A sensor unit that measures the state of the workpiece to be welded or the distance to the workpiece,
An accommodating body having an accommodating portion for accommodating the sensor unit and a shielding portion for shielding the radiant heat toward the accommodating portion among the radiant heat generated during welding of the work.
It is a welding sensor device equipped with at least
When the surface on the side where the work is welded is the front surface of the shielding portion and the opposite side is the back surface,
The heat dissipation area of the back surface of the shielding portion is larger than the heat dissipation area of the front surface .
The shielding portion is a porous body made of a metal material or a ceramic material, and is
The shielding portion is formed of a plurality of layers, and the porosity of the layer formed on the back side is higher than the porosity of the layer formed on the front side .

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